LU506377B1 - Air purification and sterilization method - Google Patents
Air purification and sterilization method Download PDFInfo
- Publication number
- LU506377B1 LU506377B1 LU506377A LU506377A LU506377B1 LU 506377 B1 LU506377 B1 LU 506377B1 LU 506377 A LU506377 A LU 506377A LU 506377 A LU506377 A LU 506377A LU 506377 B1 LU506377 B1 LU 506377B1
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000004887 air purification Methods 0.000 title claims abstract description 33
- 230000001954 sterilising effect Effects 0.000 title claims abstract description 24
- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 23
- 239000003054 catalyst Substances 0.000 claims abstract description 89
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 84
- 239000000758 substrate Substances 0.000 claims abstract description 35
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 241000894006 Bacteria Species 0.000 claims abstract description 21
- 239000004480 active ingredient Substances 0.000 claims abstract description 8
- 230000005855 radiation Effects 0.000 claims description 47
- 229910002915 BiVO4 Inorganic materials 0.000 claims description 18
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 16
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 15
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 229910052720 vanadium Inorganic materials 0.000 claims description 10
- 239000000428 dust Substances 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 9
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerol group Chemical group OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229910052684 Cerium Inorganic materials 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000012634 fragment Substances 0.000 claims description 7
- 239000002243 precursor Substances 0.000 claims description 6
- 239000000376 reactant Substances 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 229910052797 bismuth Inorganic materials 0.000 claims description 5
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 5
- 239000011572 manganese Substances 0.000 claims description 5
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 5
- -1 small molecule compounds Chemical class 0.000 claims description 5
- KKMOSYLWYLMHAL-UHFFFAOYSA-N 2-bromo-6-nitroaniline Chemical compound NC1=C(Br)C=CC=C1[N+]([O-])=O KKMOSYLWYLMHAL-UHFFFAOYSA-N 0.000 claims description 4
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 claims description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 4
- VGBWDOLBWVJTRZ-UHFFFAOYSA-K cerium(3+);triacetate Chemical compound [Ce+3].CC([O-])=O.CC([O-])=O.CC([O-])=O VGBWDOLBWVJTRZ-UHFFFAOYSA-K 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 229960004106 citric acid Drugs 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 230000002829 reductive effect Effects 0.000 claims description 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- LXASOGUHMSNFCR-UHFFFAOYSA-D [V+5].[V+5].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O Chemical compound [V+5].[V+5].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O LXASOGUHMSNFCR-UHFFFAOYSA-D 0.000 claims description 2
- 229960004543 anhydrous citric acid Drugs 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims 2
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000003915 air pollution Methods 0.000 abstract description 2
- 230000001699 photocatalysis Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 229910052878 cordierite Inorganic materials 0.000 description 7
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- 238000000746 purification Methods 0.000 description 7
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 5
- 239000003574 free electron Substances 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 241000282414 Homo sapiens Species 0.000 description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 4
- 241000700605 Viruses Species 0.000 description 4
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
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- 239000002245 particle Substances 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- OJMOMXZKOWKUTA-UHFFFAOYSA-N aluminum;borate Chemical compound [Al+3].[O-]B([O-])[O-] OJMOMXZKOWKUTA-UHFFFAOYSA-N 0.000 description 3
- 230000001580 bacterial effect Effects 0.000 description 3
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- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- 244000005700 microbiome Species 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- OUUQCZGPVNCOIJ-UHFFFAOYSA-M Superoxide Chemical compound [O-][O] OUUQCZGPVNCOIJ-UHFFFAOYSA-M 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 210000000170 cell membrane Anatomy 0.000 description 2
- 210000002421 cell wall Anatomy 0.000 description 2
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
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- 102000004169 proteins and genes Human genes 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 238000003980 solgel method Methods 0.000 description 2
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- 125000003396 thiol group Chemical group [H]S* 0.000 description 2
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- 208000035143 Bacterial infection Diseases 0.000 description 1
- IABIUAQVHLSUTH-UHFFFAOYSA-H C(C(=O)[O-])(=O)[O-].O=[V+3].C(C(=O)[O-])(=O)[O-].C(C(=O)[O-])(=O)[O-].O=[V+3] Chemical compound C(C(=O)[O-])(=O)[O-].O=[V+3].C(C(=O)[O-])(=O)[O-].C(C(=O)[O-])(=O)[O-].O=[V+3] IABIUAQVHLSUTH-UHFFFAOYSA-H 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- 241000282412 Homo Species 0.000 description 1
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- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 241000191967 Staphylococcus aureus Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- JLDSOYXADOWAKB-UHFFFAOYSA-N aluminium nitrate Chemical compound [Al+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O JLDSOYXADOWAKB-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 208000022362 bacterial infectious disease Diseases 0.000 description 1
- JHXKRIRFYBPWGE-UHFFFAOYSA-K bismuth chloride Chemical compound Cl[Bi](Cl)Cl JHXKRIRFYBPWGE-UHFFFAOYSA-K 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
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- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000030833 cell death Effects 0.000 description 1
- 229960001759 cerium oxalate Drugs 0.000 description 1
- ZMZNLKYXLARXFY-UHFFFAOYSA-H cerium(3+);oxalate Chemical compound [Ce+3].[Ce+3].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O ZMZNLKYXLARXFY-UHFFFAOYSA-H 0.000 description 1
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- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000005264 electron capture Effects 0.000 description 1
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- 230000008030 elimination Effects 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- RXPAJWPEYBDXOG-UHFFFAOYSA-N hydron;methyl 4-methoxypyridine-2-carboxylate;chloride Chemical compound Cl.COC(=O)C1=CC(OC)=CC=N1 RXPAJWPEYBDXOG-UHFFFAOYSA-N 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 231100000219 mutagenic Toxicity 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
- 108020004707 nucleic acids Proteins 0.000 description 1
- 102000039446 nucleic acids Human genes 0.000 description 1
- 150000007523 nucleic acids Chemical class 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- QLOKAVKWGPPUCM-UHFFFAOYSA-N oxovanadium;dihydrochloride Chemical compound Cl.Cl.[V]=O QLOKAVKWGPPUCM-UHFFFAOYSA-N 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
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- 231100000378 teratogenic Toxicity 0.000 description 1
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- 238000001771 vacuum deposition Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/003—Ventilation in combination with air cleaning
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
- A61L9/18—Radiation
- A61L9/20—Ultraviolet radiation
- A61L9/205—Ultraviolet radiation using a photocatalyst or photosensitiser
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
- F24F8/167—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using catalytic reactions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/192—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by electrical means, e.g. by applying electrostatic fields or high voltages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/20—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation
- F24F8/22—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using UV light
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/20—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation
- F24F8/24—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using sterilising media
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/30—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by ionisation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention discloses an air purification and sterilization method, which belongs to the field of air pollution control technology. The air purification and sterilization method comprises: providing a counter-corona plasma unit to form a plasma, the counter-corona plasma unit being sequentially provided with a corona electrode, an auxiliary electrode, an integral catalyst for VOCs, and a grounding electrode in a flowing direction of air flow, the integral catalyst for VOCs comprising a honeycomb-shaped substrate and VOCs catalysts coated on inner and outer surfaces of the honeycomb-shaped substrate, the inner and outer surfaces of the honeycomb-shaped substrate comprising whiskers, the active ingredient of the integral catalyst for VOCs comprising Ce-BiVO4-TiO2/Ag; treating the airborne VOCs and bacteria by Ce-BiVO4-TiO2/Ag under irradiation of visible and/or UV light; treating the airborne VOCs and bacteria by using the active ingredient in a plasma.
Description
DESCRIPTION LU506377
AIR PURIFICATION AND STERILIZATION METHOD
[0001] The disclosure of the present invention relates to the technical field of air pollution control, and in particular to an air purification and sterilization method.
BACKGROUND TECHNOLOGY
[0002] Air quality is closely related to the quality of human life. Due to environmental influences, air (especially indoor air) contains bacteria, such as Staphylococcus aureus and
Escherichia coli, which can cause bacterial infections, which in severe cases can lead to death. In addition, the air (especially indoor air) contains volatile organic compounds (VOC).
Most VOCs have carcinogenic, teratogenic and mutagenic, and their toxicity, persistence and difficulty in degradation seriously jeopardize human health and human living environment.
[0003] In order to address at least one aspect of the above problems and deficiencies in the prior art, the embodiments of the present invention propose a method of air purification and sterilization, with the expectation that the air (especially indoor air in homes and workshop plants, etc.) can be sterilized and VOCs can be removed therefrom, in order to improve the living environment.
[0004] According to an aspect of the present invention, there is provided a method of air purification and sterilization comprising:
[0005] providing a counter-corona plasma unit to form a plasma, wherein the counter-corona plasma unit is sequentially provided with a corona electrode, an auxiliary electrode, an integral catalyst for VOCs and a grounding electrode in a flowing direction of air flow, the integral catalyst for VOCs comprising a honeycomb substrate and VOCs catalysts coated on inner and outer surfaces of the honeycomb substrate, the inner and outer surfaces of the honeycomb substrate comprising whiskers, the integral catalyst for VOCs has an active component comprising Ce-BiVO4-TiO2/Ag;
treating airborne VOCs and bacteria by Ce-BiVOs-TiO2/Ag under radiation of visible LUS06377 and/or UV light; treating airborne VOCs and bacteria using an active ingredient in a plasma, wherein the method of preparing the integral catalyst for VOCs comprises the steps of: providing the honeycomb substrate with whiskers growing on a surface thereof; providing Ce-BiVO.-TiO2/Ag catalysts; obtaining a first reactant by mixing the Ce-BiVO4-TiO2/Ag catalyst with sodium carboxymethyl cellulose, silica sol, and water in accordance with a first mass ratio, and the first reactant is coated on the inner and outer surfaces of the honeycomb substrate with whiskers grown, dried and then baked to obtain the integral catalyst for VOCs . wherein the step of providing a Ce-BiVO4-TiO»/Ag catalyst comprises: forming a sol by cerium source, bismuth source, vanadium source and citric acid according to a second mass ratio, and forming a gel by drying at 80-100 °C, and obtaining the active powder Ce-BiVO4 by baking at 300-500 °C for 3-8 hrs; obtaining Ce-BiVO4-Ti0> by mixing the active powder Ce-BiVO4 solution with TiO» according to a third mass ratio and reacting under ultrasonic conditions for 0.5-2 hrs, and then baking at 300-500 °C for 3-8 hrs after drying at 60-100°C for 2-5 hrs; mixing silver source with Ce-BiVO4-TiO, according to a fourth mass ratio, adding a reducing agent to the mixed solution, and obtaining the Ce-BiVO4-TiOz/Ag catalyst by drying at 60-100°C for 2-5 hrs and then baking at 300-500°C for 3-8 hrs, during which Ag* is reduced to silver nanoparticles.
[0015] From the descriptions of the embodiments of the present disclosure with reference to the drawings below, other objectives and advantages of the present disclosure will become apparent, and will aid in a comprehensive understanding of the present disclosure.
[0016] These aspects and/or other aspects and advantages of the present invention will become obvious and easy understood in the description of the preferred embodiments with reference to the accompanying drawings, in which:
[0017] FIG. 1 is a schematic view of an air purification device according to an embodiment of the present invention; LUS06377
[0018] FIG. 2 is a schematic view of a method of air purification and sterilization according to an embodiment of the present invention.
[0019] The technical solution of the present disclosure will be further specifically explained below by embodiments and in conjunction with the accompanying drawings. In the specification, the same or similar reference numbers indicate the same or similar components.
The description of the embodiments of the present disclosure with reference to the drawings intends to explain the general inventive concept of the present disclosure and should not be understood as a limitation to the present disclosure.
[0020] Further, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a full understanding of the embodiments of the present disclosure. It is apparent, however, that one or more embodiments can be implemented without these specific details.
[0021] In embodiments of the present invention, an air purification device is provided in order to sterilize airborne bacteria while being able to remove airborne VOCs.
[0022] As shown in FIG. 1, the air purification device 100 includes, in the direction of air flow (in FIG. 1, the air flow flows from left to right), in turn: an air inlet 10, an counter-corona plasma unit 40, and an air outlet 60.
[0023] In one embodiment, the air purification device 100 further comprises a radiation unit 30 between the air inlet 10 and the counter-corona plasma unit 40.
[0024] In one embodiment, the air purification device 100 further comprises a filtration unit 20 between the air inlet 10 and the radiation unit 30.
[0025] In one embodiment, the air purification device 100 further includes a catalyst bed layer 50 between the counter-corona plasma unit 40 and the air outlet 60.
[0026] In use, the air to be treated enters through the air inlet 10, passes sequentially through the filtration unit 20 (if any), the radiation unit 30 (if any), the counter-corona plasma unit 40 and the catalyst bed layer 50 (if any), and ultimately discharges the treated air through the air outlet 60.
[0027] The air inlet 10 and the air outlet 60 are provided at each end of the air purification LUS06377 unit 100 to allow air to be treated to enter and exit the air purification unit 100. Referring to FIG. 1, the air inlet 10 is located at the left end of the air purification unit 100 and the air outlet 60 is located at the right end of the air purification unit 100.
[0028] The filtration unit 20 is configured to adsorb dust from the air in order to avoid that the dust is retained in the air and whereas adversely affects human beings, such as citizens or workers in the plant.
[0029] Further, as shown in FIG. 1, the filtration unit 20 includes a body frame (not shown), an electrostatic mesh 22 disposed on the body frame, and a filter 24 disposed within the body frame. The filter 24 is disposed downstream of the electrostatic mesh 22 in the direction of airflow. Referring to FIG. 1, the electrostatic mesh 22 is disposed at a front side of the filtration unit 20 and the filter 24 is disposed at a rear side of the filtration unit 20. In an embodiment, the filter unit 20 further comprises an interface to provide electrical power to the electrostatic mesh 22.
[0030] In one embodiment, the body frame is substantially rectangular in shape and includes a hollow portion (e.g., in the form of a rectangle) in a lower portion thereof, and the filter 24 is located in the hollow portion. The interface is located in the upper portion of the body frame. Embodiments of the present disclosure do not limit the specific shape of the body frame or the location and shape of the hollow portion, as long as it is capable of supporting the filter and the electrostatic mesh.
[0031] The body frame (specifically, at its hollow portion) includes a first opening side and a second opening side which are located oppositely. The first opening side is closed by the electrostatic mesh 22. The second opening side is provided with at least one mounting rod (not shown in the drawings) for mounting a radiation unit 31. The mounting rod may be provided perpendicular to the direction of airflow, and it will be facilitated to the airflow along the direction of flow (from left to right) and to help the radiation unit 30 to form a radiated light ray parallel to the direction of flow. Of course, the mounting rod may also be provided at an angle with respect to the airflow direction.
[0032] The electrostatic mesh 22 is connected (e.g., via an interface ) to a negative DC high voltage power supply , causing the dust in the art to be charged by the electrostatic mesh
22 to allow adsorption onto the filter 24 (filter 24 is grounded) behind it. LUS06377
[0033] The filter 24 is molded in one piece using ultra-fine glass fiber filter paper and nylon filaments injection molded with a plastic frame. In one example, the ultra-fine glass fiber filter paper has a moisture-resistant coating on the outer surface. The filter 24 is a V-shaped pleated paper structure, for example, it can be produced by hot rolling process. The V-shaped pleated paper structure can ensure that the filtration area can be fully utilized, and make the dust uniformly distributed on the surface of the filter surface, and at the same time, it can play the role of infusion, so that the airflow distribution is uniform, the pressure drop rises slowly, economically and safely, and the filter 24 has a long service life.
[0034] The radiation unit 30 includes at least one UV light source. The UV light source emits a first UV radiation. The wavelength of the first UV radiation may be selected as 185 nm, 222 nm, 254 nm, 308 nm, etc., or a combination of several different wavelengths of the UV light source. The first UV radiation may be used to sterilize airborne bacteria. The first UV radiation may also acts on the active ingredient of integral or one-piece VOCs in order to purify the air.
[0035] Optionally, the radiation unit 30 further comprises at least one visible light source.
The visible light source emits visible light in the range of 400-700 nm. The visible light may act on the active ingredient of the integral catalyst for VOCs in order to in order to purify the air.
[0036] Both the UV light source and the visible light source are disposed on a mounting plate. The embodiments of the present invention do not limit the number of the UV light sources and the visible light sources, and those skilled in the art may set them up as desired.
The UV light sources and the visible light sources may be provided as one, two, three or more apart from each other, or the visible light sources may be arranged in the middle of the mounting plate and the UV light sources may be arranged at the ends of the mounting plate.
Embodiments of the present invention do not limit the manner in which the UV light sources and the visible light sources are arranged. In an example embodiment, the UV light sources and the visible light sources are arranged on the mounting plate towards the integral catalyst for VOCs, and it is facilitated to the radiation emitted by the light sources to react more fully with the integral catalyst for VOCs.
[0037] The counter-corona plasma unit 40 comprises, in the direction of airflow, in turn: a LUS06377 corona electrode 42, an auxiliary electrode 44, an integral catalyst for VOCs 46, and a grounding electrode 48.
[0038] The corona electrode 42 is powered by the negative DC high voltage power supply.
The corona electrode 42 causes the air in the vicinity of the corona electrode 42 to be ionized to generate a large amount of negative charge during the discharge process, which can interact with the integral catalyst for VOCs 46 to form a counter-corona plasma. The corona electrode 42 may be made of tungsten wire, and the diameter of the tungsten wire is between 2 and 6 mm.
[0039] The auxiliary electrode 44 inhibits the corona electrode 42 discharge from ionized discharge towards spark discharge. The auxiliary electrode 44 may be made of tungsten wire, the diameter of the tungsten wire being between 2 and 6 mm.
[0040] The integral catalyst for VOCs 46 includes a honeycomb substrate and VOCs catalyst coated on the inner and outer surfaces of the honeycomb substrate.
[0041] The honeycomb substrate has a large specific surface area, which can provide larger attachment sites for VOCs catalyst coating. In one embodiment, the honeycomb substrate of the integral catalyst for VOCs 46 is made of cordierite, foam metal (nickel), alumina or silicon carbide.
[0042] The honeycomb substrate includes whiskers on the inner and outer surfaces thereof. In an embodiment, the whiskers comprise mullite whiskers, aluminum borate whiskers or silicon carbide whiskers.
[0043] The active component of the integral catalyst for VOCs 46 includes
Ce-BiVO4-Ti02/Ag catalyst.
[0044] In an embodiment, the method of preparing integral catalyst for VOCs comprises the steps of:
[0045] providing a honeycomb substrate with whiskers growing on the surface:
[0046] providing Ce-BiVO4-TiO2/Ag catalysts;
[0047] obtaining a first reactant by mixing Ce-BiVO4-TIO2/Ag catalyst with sodium carboxymethyl cellulose, silica sol, and water according to a first mass ratio (e.g., (20-30):(15-20):(10-15):(30-45)), wherein the first reactant was coated on the inner and outer surfaces of the whisker-growing honeycomb substrate, and was dried and then baked (at LUS06377 300-600 °C for 3-6 hours) to obtain an integral VOCs catalyst.
[0048] The step of providing the honeycomb substrate with whiskers growing on the surface includes:
[0049] obtaining the mixed material by encapsulating the honeycomb substrate the whisker feedstock, anhydrous aluminum sulfate and anhydrous sodium sulfate;
[0050] baking the mixed material at 900-1200°C (e.g. 1000°C) for 2-12 hours (e.g. 8 hours) and then cooling it to grow whiskers on the inner and outer surfaces of the honeycomb substrate.
[0051] In one embodiment, the step of providingthe Ce-BiVO4-TiOz/Ag catalyst includes:
[0052] a cerium source, a bismuth source, a vanadium source and a citric acid are formed into a sol according to the second mass ratio, the gel is formed after drying (e.g., in a thermostatic drying oven) at 80-100°C (e.g., 90°C), and an activated powder Ce-BiVO4 is obtained by baking at 300-500°C (e.g., 350-400°C) for 3-8 hours (e.g., 4-6 hours);
[0053] a solution of the activated powder Ce-BiVO4 is mixed with TiO. in the third mass ratio and reacted under ultrasonic conditions (e.g., under ultrasonic oscillation) for 0.5-2 hours (e.g., 1-1.5 hours), dried (e.g., rotary drying) at 60-100°C (e.g., 80-90°C) for 2-5 hours (e.g., 3-4 hours), and then baked at 300-500°C (e.g., 400-450°C) for 3-8 hours (e.g., 5-6 hours) to obtain Ce-BiVO4-Ti0 ;
[0054] a silver source is mixed with Ce-BiVO4-TiOz in the fourth mass ratio, a reducing agent (e.g., glycerol) is added to the mixed solution, and after drying (e.g., rotary drying) at 60-100°C (e.g., 80-90°C) for 2-5 hrs (e.g., 3-4 hrs) and then baking at 300-500°C (e.g., 400-450°C) for 3-8 hrs (e.g., 5-6 hrs), in order to obtain the Ce-BiVO4-TiOz/Ag catalyst.
[0055] The inventors of the present invention noted that TiO. catalysts have a broad (specifically, 3.2 eV) band gap, which has a low utilization of both UV and visible light, also has a low photoresponsive range; BiVO4 can be used as a photocatalytic material too, but it also has a relatively low utilization of both visible and UV light, which limits the application of
TiO2 and BiVO4 in photocatalysis. In view of this, the present invention proposes to combine
TiO» and BiVO4 together, and mix with (Ce and Ag) through ion-doping method, which enlarges the range of photoresponsiveness and thus improves the catalytic efficiency of the catalyst. LU506377
[0056] Specifically, cerium (Ce) ions are doped inside the crystal structure of the BiVO4 catalyst, then changes the internal composition of the catalyst, thereby altering its electronic structure and realizing the modulation of its band and band gap, thus improving the photocatalytic activity. Cerium (Ce) ions are considered to be more effective dopants due to their unique 4f electron orbital configuration. The results show that the substitution of Bi by Ce in the BiVO4 lattice significantly suppresses the complexation of photogenerated charges and improves the photocatalytic activity, which is attributed to the fact that Ces; * and Cev” are the major defects in Ce-doped BiVO4 under the Bi/V-poor and O-rich conditions and can be a p-type material, where Ceg'* degrades the activity with an unoccupied deep energy level, which mainly consists of Ce's 4f orbital, which is a deep complex center. For the Ce" defect, no localized state is found in Ce-BiVO4 , whose formation energy is sensitive to both the chemical potential and the Fermi energy, suggesting that Bi/V-poor and O-rich conditions are favorable for the elimination of the deep-energy level state and the improvement of the photocatalytic performance. Therefore, with the establishment of Cey' doping process, the doping of Ce into BiVO4 can enhance the photocatalytic activity.
[0057] In the case of TiO. and Ce-BiVO4 composites, this leads to lattice spacing adjustments, which in turn causes changes in the crystalline phases, thus enlarges the range of photoresponsiveness.
[0058] In the above producing process, Ag+ is reduced to silver nanoparticles (AgNPs) during the baking process, which resulted in the excellent photocatalytic performance of the
Ce-BiVO4-TiO2/Ag catalyst. Specifically, the photocatalyst absorbs light energy under the irradiation of certain wavelengths (e.g., ultraviolet radiation and visible light radiation), and the electrons in the valence band will be stimulated to jump to the conduction band to form photogenerated electrons (e' ),when it is stimulated by the energy greater than its band gap, at the same time, holes in the valence band will be generated (h*). h* is strongly oxidizing, and € is reductive, and it can undergo oxidation and reduction reactions with water and oxygen, respectively, to produce hydroxyl radicals. superoxide anion. hydrogen peroxide and singlet oxygen. AgNPs can play the role of electron traps, assisting electron-hole separation and electron capture by generating a local electric field, which increases the number of active species, such as hydroxyl radicals, superoxide anion, hydrogen peroxide and singlet oxygen, LUS06377 and thus enhances the photocatalytic activity. Moreover, the photogenerated electrons can collide with VOCs gas-phase molecules to break their chemical bonds to generate molecular fragments as well as other small molecules, thus realizing the use of photocatalytic activity to remove VOCs from the air.
[0059] Moreover, AgNPs contribute to air sterilization. Silver ions precipitated by AgNPs can interact with the sulfhydryl groups (-SH) of enzymes and biomolecules in the bacterial body, leading to their inactivation and thus limiting bacterial growth. In addition, AgNPs have a nanoeffect, which means that AgNPs can attach to the cell wall and penetrate into the bacterial cell, the process will lead to structural change that can lead to cell death, allowing hybridized membranes to function even under dark conditions.
[0060] Further, the cerium source comprises at least one of cerium acetate and its hydrate, cerium oxalate and its hydrate, cerium nitrate and its hydrate; the bismuth source comprises at least one of bismuth citrate, bismuth trichloride, bismuth nitrate and its hydrate; and the vanadium source comprises at least one of vanadium oxydate sulphate, vanadium oxydate oxalate, vanadium oxydacetate, vanadium oxydichloride, vanadium oxydate phosphate.
[0061] In embodiments using cerium acetate, bismuth citrate and oxovanadium oxalate, the second mass ratio is (10-15):(15-20):(5-10):(60-70), for example 12:18:8:62.
[0062] Further, the third mass ratio is (15-20):(80-85), for example 18:82. The fourth mass ratio is (10-20):(80-90), for example 15:85.
[0063] In an embodiment of the present invention, the corona electrode 42 causes the air in the vicinity of the corona electrode 42 to be ionized to generate a large number of negative charges, and accumulate on the inner and outer surfaces of the integral catalyst 46 for VOCs during the discharge process; the accumulated charges generate a superimposed electric field in the internal pores of the honeycomb substrate, and a counter-corona plasma is generated when the field strength of the superimposed electric field reaches or exceeds the breakdown field strength of the whiskers on the surface of the internal pores of the honeycomb substrate. The counter-corona plasma is generated in the internal pores of the honeycomb substrate, thus forming a plasma reaction channel, and the free electrons,
high-energy ions, and active particles generated in the plasma reaction channel are tightly LUS06377 coupled with the active components of the integral catalyst for VOCs 46 on the inner and outer surfaces of the integral catalyst for VOCs 46 to give full play to the advantages of both the plasma's high reactivity and the high reaction selectivity of VOCs catalyst , and activate the VOCs catalyst reactivity, improve the reaction selectivity of the counter-corona plasma, promote the VOCs reaction to occur at room temperature or low temperature, and finally the
VOCs in the air are oxidized to be HO and Oa .
[0064] In an embodiment of the present invention, as the active component of the integral catalyst for VOCs, Ce-BiVO4-TiO2/Ag can reach a dielectric constant of more than 10,000 at room temperature during a counter corona plasma discharge process. During the counter corona plasma discharge process, the presence of Ce-BiVO«4-TiO2/Ag can polarize the integral catalyst for VOCs under a small electric field strength, which significantly enhances the discharge strength of the counter-corona plasma, and thus obtains a large number of free electrons, hydroxyl radicals, ozone and other active particles. In this way, on the one hand, the redox reaction of VOCs gas-phase molecules can be induced to generate CO, and HO, and on the other hand, a large number of free electrons constitute a serious breakdown and destruction of the cell membrane of bacteria and viruses, which enhances the sterilizing effect.
In this way, setting the integral catalyst for VOCs in the counter-corona plasma can improve the energy utilization efficiency of the counter-corona plasma, and reduce the energy consumption of the counter-corona plasma.
[0065] In an embodiment, a second ultraviolet radiation also is included in the plasma.
The wavelength of the second UV radiation may include 150 nm or 160 nm. The wavelength of the second UV radiation is smaller than the wavelength of the first UV radiation. The second UV radiation will work with the first UV radiation to together treat VOCs and bacteria in the air. This will be described in detail below.
[0066] In an embodiment, plasma can sterilize the air. The plasma contains a large number of high-energy ions, active groups and other components that easily chemically react with enzymes, proteins and nucleic acids in bacteria, molds, spores and viruses, destroying and disrupting the survival functions of microorganisms and causing the death of various types of microorganisms. The directed movement of high-energy particles in the plasma can
"break" the proteins of bacteria, cells and viruses and destroy the integrity of genes, due to LUS06377 the high-voltage electric field wherein the escaping electrons and free electrons are accelerated to obtain high energy, with high kinetic energy of the electrons and breakdown and etching effect, the cell membrane of the bacteria and viruses constitute a serious breakdown and damage. The plasma targets to damage various structures of microorganisms, etching cell walls, destruction of biological membranes and lipid peroxide, and bacterial DNA and RNA may be oxidized and damaged.
[0067] The catalyst bed layer 50 is used to treat ozone in the air. Ozone is generated, for example, during plasma formation, and can be treated by the catalyst bed layer 50 disposed behind the counter-corona plasma unit 40. The catalyst bed layer 50 includes 3D foam ceramic carrier and manganese and cobalt bimetallic active component coated on the surface of the 3D foam ceramic carrier.
[0068] In an embodiment, providing a catalyst bed layer comprises:
[0069] Mn(CH:COOz4H20, Co(CH:COO)- -4H:0, anhydrous citric acid are formed into a precursor solution according to the mass ratio of (15-20):(25-30):(50-60), wherein the ionic concentration in the precursor solution is 0.5-2 mol/L (e.g., 1 mol/L) , and after 60-100°C (e.g., 80-90°C) drying for 2-5 hours (e.g., 3 hours), then baking at 300-500°C (e.g., 400°C) for 3-6 hours (e.g., 5 hours) to obtain the Coa,Mn-.20, catalyst, wherein a is in the range of 0.2-0.8 (e.g., 0.2, 0.33, 0.5, 0.67, and 0.8);
[0070] the 3D foam ceramics (e.g., cut 3D foam ceramics) are impregnated in a
CoaMnO4.ax catalyst solution (e.g., CoaMn1..Ox catalyst dissolved in a solution of ethanol and water) under ultrasonic conditions for 0.5-1 hr, and then dried for 2-8 hrs (e.g., 5 hrs) at 60-100 °C (e.g., 80-90 °C).
[0071] The main active component of the Co.Mn..Ox catalyst which is located in the catalyst bed layer of the 3D foam ceramic, is MnO, , and the CoaMn1..0Ox catalyst prepared by the sol-gel method shows a loose porous structure, which is conducive to the gas-phase molecules adsorbed on the surface of the Co.Mn1..0Ox catalyst, and then catalytic reaction occurs.
[0072] The sol-gel method can make the metal salt precursor highly dispersed at the molecular level, so the doping element Co can enter the interior of the crystal phase of MnO, ,
which in turn destroys the crystal structure of MnO, , which is conducive to the generation of a LUS06377 large number of oxygen vacancies on the surface of MnO, When the oxygen molecule passes through the MnO, surface, the ozone molecule combines with the oxygen vacancy through the terminal oxygen atom, and the oxygen vacancy is the 2e" electron donor, which transfers the 2e" electrons to the O atom of ozone, resulting in the breakage of the O-O bond of ozone, releasing oxygen and generating O% ; the other ozone terminal oxygen atom adsorbs with O% and combines with the electron transfer, resulting in the O-O bond of ozone being broken, releasing oxygen and generating Oz% ; and finally the O2? decomposition releases oxygen, and the oxygen vacancies are restored, participate in the next ozone decomposition cycle. Thus, the catalyst bed layer of the present invention is capable of removing ozone from the air.
[0073] In embodiments of the present invention, an air purification and sterilization method is also provided. As shown in FIG. 2, the air purification and sterilization method comprises:
[0074] a counter-corona plasma unit is provided to form a plasma, the counter-corona plasma unit being provided with a corona electrode, an auxiliary electrode, an integral VOCs catalyst and a grounding electrode in the direction of air flow in sequence, the integral VOCs catalyst comprising a honeycomb substrate and a VOCs catalyst coated on the inner and outer surfaces of the honeycomb substrate, the inner and outer surfaces of the honeycomb substrate comprising whiskers, the integral VOCs catalyst having an active component comprising Ce-BiVO4-TiO2/Ag.
[0075] Airborne VOCs and bacteria are treated by Ce-BiVO4-TiO2/Ag under radiation of visible and/or UV light;
[0076] Airborne VOCs and bacteria are treated by using active ingredient in a plasma.
[0077] In embodiments of the present invention, air purification and sterilization is achieved by treating airborne VOCs and bacteria, which is achieved by using
Ce-BiVO4-Ti0-/Ag in the integral catalyst for VOCs and active components (e.g., free electrons, energetic ions, and active particles) in the plasma. That is, synergistic treatment using both actions to purify air and sterilize bacteria greatly improves treatment efficiency compared to each individual technology.
[0078] In embodiments of the present invention, the active ingredients in LUS06377
Ce-BiVO4-TiO2/Ag (specifically, Ce, Bi, V, Ag) allow the method of the present invention to make the catalyst to function as a photocatalytic reaction in the presence of radiation from visible light. The method of the present invention is more efficient and less costly than TiO; catalyst that only absorbs UV radiation.
[0079] In an example, the method of air purification and sterilization further comprises: treating VOCs and bacteria in the air by a combination of the ultraviolet radiation of the first ultraviolet radiation with the second ultraviolet radiation.
[0080] Further, treatment of the VOCs by a combination of UV radiation comprises:
[0081] the combination of the UV radiation makes the molecular bonds of the VOCs to break and generate active molecular fragments;
[0082] oxygen and water vapor molecules in the air are made to generate first reactive species by a combination of the ultraviolet radiation, the first reactive species comprising reactive oxygen atoms and hydroxyl radicals;
[0083] the oxidation of the active of molecular fragments forming small molecule compounds is made possible by the first reactive species.
[0084] Embodiments of the present invention use a combination of different wavelengths of UV radiation, which can provide stronger radiation energy and help to treat the VOCs into the smallest possible active molecular fragments. The small active molecular fragments can be more easily oxidized, i.e., generate small molecular compounds. As a result, airborne
VOCs can be treated more efficiently using a combination of different wavelengths of UV radiation.
[0085] In an example embodiment, the air purification and sterilization method further comprises: connecting an electrostatic mesh to a negative DC high-voltage power source, causing dust in the air to be charged as it passes through the electrostatic mesh; and causing the charged dust to be adsorbed on the surface of the filter. As a result, embodiments of the present invention can effectively remove dust from the air and improve air quality.
[0086] In an example embodiment, the air purification and sterilization method further comprises: treating ozone in the air by the catalyst bed layer. As a result, embodiments of the present invention can effectively remove ozone from the air and avoid the hazards of ozone emissions to humans. LUs06377
[0087] The efficiency of the method of the present invention for treatment of airborne
VOCs will be illustrated in the following with a specific example.
[0088] 1. Preparation of the integral catalyst for VOCs
[0089] Cerium acetate, bismuth citrate, vanadium oxalate and citric acid are dissolved in 12:18:8:62 mass ratio to form a sol, dried at 90°C to form a gel, and then baked at 350°C for 5 hrs to obtain the active powder Ce-BiVO4 . The active powder Ce-BiVO4 is dissolved in water, then it is uniformly mixed with TiO, powder in the ratio of 18:82, and then reacts under the ultrasonic vibration for 1 hr, and after rotary drying at 80°C for 3 hrs and then baked at 400°C for 5 hrs to obtain Ce-BiVO4-TiO>. Silver nitrate (AgNOs) is mixed with Ce-BiVO4-TiOz in the ratio of 15:85 by mass, and glycerol is added into the mixed solution, which is rotary dried at 80 °C for 3 hrs and then baked at 400 °C for 5 hrs, to obtain Ce-BiVO4,-TiOz/Ag catalysts.
[0090] Boron trioxide, aluminum nitrate, anhydrous aluminum sulfate, and anhydrous sodium sulfate are added to the cordierite honeycomb substrate, so that the mass ratio of cordierite honeycomb substrate: boron trioxide: aluminum nitrate: anhydrous aluminum sulfate: anhydrous sodium sulfate is 30:15:15:20:15, and so that the cordierite honeycomb substrate is at least partially embedded by the boron trioxide, the aluminum nitrate, the anhydrous aluminum sulfate, and the anhydrous sodium sulfate, preferably fully embedded.
The mixture material is baked in a muffle furnace at 1000°C for 6 hrs and naturally cooled to room temperature, where dense aluminum borate whiskers grows on the surface of the cordierite honeycomb substrate.
[0091] Ce-BiVO4-TiOz/Ag catalyst powder is mixed uniformly with sodium carboxymethyl cellulose, silica sol, and water according to the mass ratio of 25: 28:12:35 to obtain the catalyst slurry, and by a vacuum coating machine,the catalyst slurry is coated on the cordierite honeycomb substrate with the aluminum borate whiskers growing on the surface, and the coated material is placed in a drying oven at 100 °C for 2 hrs, and then placed in a muffle furnace at 450 °C for 6 hrs to obtain the integral catalyst for VOCs of the present invention.
[0092] 2. Treatment of VOCs
[0093] Treatment is performed using the air purification device of the present invention.
[0094] VOCs simulation gas is provided, which includes three gases: 100ppm formaldehyde, 100ppm toluene and 100ppm styrene. The above three gases are precisely LUS06377 controlled by a mass flow meter to ensure that the flow rates of the three gases are the same, and the concentration of VOCs is 300ppm. The gases are fully mixed in the mixing tank and then passed into the reaction device, and air is selected as the carrier gas. The stabilized gas mixture is adjusted and directly fed into the reaction device. The plasma generation intensity of the counter-corona plasma unit is regulated by controlling the negative high-voltage DC power supply connected to the corona electrode. On-line gas chromatography is connected to the air outlet of the counter-corona plasma unit for real-time detection of VOCs concentration.
The negative high-voltage DC voltage strength of the negative corona plasma connected to the corona electrode is set to be 6 kV, 8 kV, 10 kV, 12 kV, 14 kV, and 16 kV, in that order. The embodiment of the present invention calculates the purification efficiency using the following formula:
The purification efficiency of VOCs = Inlet conc .of VOCs — Outlet conc.of VOCs
Inlet conc.of VOCs
[0095] In addition, comparative examples are provided. In the comparative examples, a catalyst slurry is not coated on a cordierite honeycomb substrate with whiskers growing on it, and the rest of the conditions are the same as in the embodiments of the present invention.
[0096] Table 1 illustrates the purification effect of the embodiments of the present invention with respect to the comparative examples. According to Table 1, it can be seen that the purification efficiency of the embodiment of the present invention for VOCs is as high as 96%, realizing a very high purification efficiency.
Table 1 comparative examples Examples of the invention counter-corona plasma VOCs purification
VOCs purification efficiency/%
Negative High efficiency (uncoated Ce-BiVO4-TiO2/Ag
Voltage DC (coated with slurry)
Voltage Ce-BiVO4-TiOz/Ag slurry)
Strength/kV
Ce ee oe | ew oo N
MM we #8 | ww
[0097] The foregoing is only a preferred embodiment of the present invention, and is not intended to limit the present invention, which may be subject to various changes and variations for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.
Claims (8)
1. A method of air purification and sterilization, comprising: providing a counter-corona plasma unit to form a plasma, wherein the counter-corona plasma unit is sequentially provided with a corona electrode, an auxiliary electrode, an integral catalyst for VOCs and a grounding electrode in a flowing direction of air flow, the integral catalyst for VOCs comprising a honeycomb substrate and VOCs catalysts coated on inner and outer surfaces of the honeycomb substrate, the inner and outer surfaces of the honeycomb substrate comprising whiskers, the integral catalyst for VOCs has an active component comprising Ce-BiVO4-TiO2/Ag; treating airborne VOCs and bacteria by Ce-BiVOs-TiO2/Ag under radiation of visible and/or UV light; treating airborne VOCs and bacteria using an active ingredient in a plasma, wherein the method of preparing the integral catalyst for VOCs comprises the steps of: providing the honeycomb substrate with whiskers growing on a surface thereof; providing Ce-BiVO.-TiO2/Ag catalysts; obtaining a first reactant by mixing the Ce-BiVO4-TiO2/Ag catalyst with sodium carboxymethyl cellulose, silica sol, and water in accordance with a first mass ratio, and the first reactant is coated on the inner and outer surfaces of a honeycomb substrate with whiskers grown, dried and then baked to obtain the integral catalyst for VOCs; wherein the step of providing a Ce-BiVO4-TiO»/Ag catalyst comprises: forming a sol by cerium source, bismuth source, vanadium source and citric acid according to a second mass ratio, and forming a gel by drying at 80-100°C, and obtaining the active powder Ce-BiVO4 by baking at 300-500°C for 3-8 hrs; obtaining Ce-BiVO4-Ti0> by mixing the active powder Ce-BiVO4 solution with TiO» according to a third mass ratio and reacting under ultrasonic conditions for 0.5-2 hrs, and then baking at 300-500°C for 3-8 hrs after drying at 60-100°C for 2-5 hrs; mixing silver source with Ce-BiVO4-TiO, according to a fourth mass ratio, adding a reducing agent to the mixed solution, and obtaining the Ce-BiVO4-TiOz/Ag catalyst by drying at 60-100°C for 2-5 hrs and then baking at 300-500°C for 3-8 hrs, during which Ag* is reduced to silver nanoparticles. LUS06377
2. The method of air purification and sterilization according to claim 1, wherein the first mass ratio is (20-30): (15-20): (10-15): (30-45); the cerium source comprises cerium acetate; the bismuth source comprises bismuth citrate; the vanadium source comprises vanadium oxalate; the second mass ratio is (10-15):(15-20):(5-10):(60-70); the third mass ratio is (15-20):(80-85); the fourth mass ratio is (10-20):(80-90); the reducing agent is glycerol.
3. The method of air purification and sterilization according to any one of claims 1-2, further comprising: providing a radiation unit upstream of the counter-corona plasma unit in the flowing direction of the air flow, the radiation unit comprising at least one UV source to emit a first ultraviolet radiation, the first ultraviolet radiation having a greater wavelength than the one of the second ultraviolet radiation in the plasma; treating airborne VOCs and bacteria by a combination of UV radiation of the first UV radiation with the second UV radiation.
4. The method of air purification and sterilization according to claim 3, wherein causing the molecular bonds of the VOCs to break to generate reactive molecular fragments by the combination of the UV radiation; making oxygen and water vapor molecules in the air to generate first reactive species by the combination of the UV radiation, the first reactive species comprising reactive oxygen atoms and hydroxyl radicals; oxiding the active molecular fragments by the first reactive species to form small molecule compounds.
5. The method of air purification and sterilization according to claim 4, wherein LUS06377 the radiation unit further comprising at least one visible light source to emit visible light, the airborne VOCs and bacteria are treated by Ce-BiVO4-TiO2/Ag under irradiation with the visible light and/or the first UV radiation.
6. The method of air purification and sterilization according to claim 5, further comprising: providing a filter unit upstream of the radiation unit in the flowing direction of air flow, the filter unit being provided with an electrostatic mesh and a filter in sequence in the flowing direction of air flow; connecting the electrostatic mesh to a negative high-voltage DC power supply to cause the airborne dust to become charged as it passes through the electrostatic mesh; allowing the charged dust to be attracted to a surface of the filter and grounding the filter.
7. The method of air purification and sterilization according to claim 6, further comprising: providing a catalyst bed layer downstream of the counter-corona plasma unit in the flowing direction of air flow, the catalyst bed layer comprising a 3D foam ceramic carrier and a manganese and cobalt bimetallic active component loaded on a surface of the 3D foam ceramic carrier; treating airborne ozone by the catalyst bed layer.
8. The method of air purification and sterilization according to claim 7, wherein providing a catalyst bed layer includes: forming a precursor solution by Mn(CH:COOz-4H20, Co(CH:COO)z -4H,0, anhydrous citric acid according to a mass ratio of (15-20):(25-30):(50-60), whereinionic concentration in the precursor solution was 0.5-2 mol/L, and the precursor solution is dried for 2-5 hrs at 60-100°C and then baked for 3-6 hrs at 300-500°C to obtain Co.Mn1..O« catalyst, a is in the range of 0.2-0.8; impregnating the 3D foam ceramics in a CoaMn1..0Ox catalyst solution under ultrasonic conditions for 0.5-1 hr, and then drying it at 60-100 °C for 2-8 hrs.
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| CN116081687B (en) * | 2022-12-14 | 2024-05-10 | 成都先进金属材料产业技术研究院股份有限公司 | Bismuth vanadate powder based on ultrasonic and/or microwave dispersion and preparation method thereof |
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| CN102284077A (en) * | 2010-06-18 | 2011-12-21 | 上海牛翼新能源科技有限公司 | Multifunctional high-efficiency air purifier for indoor (vehicle) environment |
| CN102958264B (en) * | 2012-11-20 | 2015-04-22 | 浙江大学 | Plasma generation device and method based on back corona creeping-surface breakdown of catalyst as well as application thereof |
| CN104190433A (en) * | 2014-08-15 | 2014-12-10 | 浙江省环境保护科学设计研究院 | Catalytic ozonation catalyst for volatile organic waste gas treatment as well as preparation method and application of catalytic ozonation catalyst |
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| CN115419974A (en) | 2022-12-02 |
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