CN108310969B - Outdoor air purification module and purification method - Google Patents
Outdoor air purification module and purification method Download PDFInfo
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- CN108310969B CN108310969B CN201810161211.1A CN201810161211A CN108310969B CN 108310969 B CN108310969 B CN 108310969B CN 201810161211 A CN201810161211 A CN 201810161211A CN 108310969 B CN108310969 B CN 108310969B
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- 238000004887 air purification Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 26
- 238000000746 purification Methods 0.000 title abstract description 17
- 230000003197 catalytic effect Effects 0.000 claims abstract description 56
- 239000000428 dust Substances 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 10
- 238000003912 environmental pollution Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 239000000919 ceramic Substances 0.000 claims description 53
- WYCDUUBJSAUXFS-UHFFFAOYSA-N [Mn].[Ce] Chemical compound [Mn].[Ce] WYCDUUBJSAUXFS-UHFFFAOYSA-N 0.000 claims description 32
- 239000002131 composite material Substances 0.000 claims description 29
- 238000006555 catalytic reaction Methods 0.000 claims description 25
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000007800 oxidant agent Substances 0.000 claims description 10
- 230000001590 oxidative effect Effects 0.000 claims description 10
- 239000011572 manganese Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 8
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical group [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 8
- 150000000703 Cerium Chemical class 0.000 claims description 7
- 150000002696 manganese Chemical class 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 238000009210 therapy by ultrasound Methods 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical group [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 239000012716 precipitator Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052684 Cerium Inorganic materials 0.000 claims description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 3
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- 239000007772 electrode material Substances 0.000 claims description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 229910021380 Manganese Chloride Inorganic materials 0.000 claims description 2
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical compound Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 claims description 2
- HKVFISRIUUGTIB-UHFFFAOYSA-O azanium;cerium;nitrate Chemical compound [NH4+].[Ce].[O-][N+]([O-])=O HKVFISRIUUGTIB-UHFFFAOYSA-O 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 229910052878 cordierite Inorganic materials 0.000 claims description 2
- 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 claims description 2
- 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 claims description 2
- 238000007598 dipping method Methods 0.000 claims description 2
- 239000011565 manganese chloride Substances 0.000 claims description 2
- 235000002867 manganese chloride Nutrition 0.000 claims description 2
- 229940099607 manganese chloride Drugs 0.000 claims description 2
- 229940099596 manganese sulfate Drugs 0.000 claims description 2
- 239000011702 manganese sulphate Substances 0.000 claims description 2
- 235000007079 manganese sulphate Nutrition 0.000 claims description 2
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052863 mullite Inorganic materials 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- -1 polytetrafluoroethylene Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910000881 Cu alloy Inorganic materials 0.000 claims 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000009413 insulation Methods 0.000 claims 1
- 239000012774 insulation material Substances 0.000 claims 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000003915 air pollution Methods 0.000 abstract description 2
- 230000000593 degrading effect Effects 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 43
- 239000003570 air Substances 0.000 description 39
- 239000003344 environmental pollutant Substances 0.000 description 17
- 231100000719 pollutant Toxicity 0.000 description 17
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 14
- 239000003054 catalyst Substances 0.000 description 12
- 239000007789 gas Substances 0.000 description 12
- 239000012855 volatile organic compound Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 8
- LQWKWJWJCDXKLK-UHFFFAOYSA-N cerium(3+) manganese(2+) oxygen(2-) Chemical compound [O--].[Mn++].[Ce+3] LQWKWJWJCDXKLK-UHFFFAOYSA-N 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 239000010419 fine particle Substances 0.000 description 6
- 239000000809 air pollutant Substances 0.000 description 4
- 231100001243 air pollutant Toxicity 0.000 description 4
- 238000000975 co-precipitation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 229960004106 citric acid Drugs 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical group [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- YASYEJJMZJALEJ-UHFFFAOYSA-N Citric acid monohydrate Chemical compound O.OC(=O)CC(O)(C(O)=O)CC(O)=O YASYEJJMZJALEJ-UHFFFAOYSA-N 0.000 description 1
- 244000248349 Citrus limon Species 0.000 description 1
- 235000005979 Citrus limon Nutrition 0.000 description 1
- 229910016978 MnOx Inorganic materials 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- AUFVVJFBLFWLJX-UHFFFAOYSA-N [Mn].[La] Chemical compound [Mn].[La] AUFVVJFBLFWLJX-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- QQZMWMKOWKGPQY-UHFFFAOYSA-N cerium(3+);trinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O QQZMWMKOWKGPQY-UHFFFAOYSA-N 0.000 description 1
- 229960002303 citric acid monohydrate Drugs 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
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- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002135 nanosheet Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
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- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
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- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
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Images
Classifications
-
- 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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- 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
- B01D53/32—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 by electrical effects other than those provided for in group B01D61/00
-
- 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
- B01D53/8671—Removing components of defined structure not provided for in B01D53/8603 - B01D53/8668
- B01D53/8675—Ozone
-
- 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
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
-
- B01J35/56—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
Abstract
The invention belongs to the field of air purification devices, and discloses an outdoor air purification module which comprises a plasma dust removal part and a normal-temperature catalytic purification part, and specifically comprises an insulating support, a discharge unit, a normal-temperature catalytic module and a fan. The invention drives the airflow around the module to flow and enter the purification module through the fan, the environmental pollution airflow firstly enters the plasma dust removal part to filter particles, and the filtered air degrades NOx and O through the normal temperature air purification module3And discharging the polluted gas through the top air duct. The functions of filtering particles and degrading polluted gas are achieved, and outdoor air pollution is effectively relieved.
Description
Technical Field
The invention belongs to the field of air pollution control and environmental engineering, and relates to a method for removing outdoor air fine particulate matters and typical gaseous pollutants, such as nitrogen oxides (NOx), Volatile Organic Compounds (VOCs) and ozone (O)3) A purification module and a purification method.
Background
With the rapid development of economy in China, the continuous improvement of industrialization and urbanization levels, the number of motor vehicles is rapidly increased, the discharge amount of fine particulate matters and typical gaseous pollutants in the air is increased year by year, and the ecological environment and the quality of human life are seriously damaged; at present, particulate matters, NOx and VOCs discharged in the industrial production process are mainly reduced through a source control technology at home and abroad, and because the economic quantity of China is large, even if the industrial source discharge reaches the national standard, the total quantity of pollutants released into the environment is still large, so that the development of effective environmental air purification equipment and technical means has important practical significance for controlling the whole atmospheric environmental pollution; for example, chinese patent CN104141993A discloses an outdoor air purifier including a housing, a filtering system, and a solar battery; CN205481453A discloses an outdoor air purifier comprising a chassis and a fan chamber; however, the above devices are all matched with a fixed shape and cannot be flexibly installed according to the requirements of different occasions, so that a purification module which can be flexibly adjusted according to devices with different shapes needs to be researched and developed urgently to meet the requirements of different occasions;
the plasma technology is a new air purification technology, and compared with the traditional purification technology, the plasma technology has the advantages of few byproducts, no radioactive substance, short action time and the like, and has great market potential; the manganese-cerium composite oxide has good oxidation-reduction property, and can be used as a high-efficiency catalytic material for low-temperature catalytic oxidation of NOx and VOCs; chinese patent CN101791550A discloses a method for removing NO by high-efficiency catalytic oxidation under the condition of plasma, which is characterized in that gas is activated by low-temperature plasma and then purified by a fixed bed reactor filled with a catalyst, wherein the catalyst is manganese oxide, manganese lanthanum composite oxide or manganese cerium composite oxide and the like prepared by a citric acid method; however, the method removes NOx by catalytic oxidation at a high temperature of 80-150 ℃, has high reaction energy consumption, and is difficult to effectively purify typical air pollutants under the conditions of normal temperature and normal pressure;
therefore, the manganese-cerium composite oxide is prepared by an improved oxidation-coprecipitation method on the basis of combining low-temperature plasma air purification; developing a shape which can be flexibly adjusted according to different occasions to remove PM2.5Equal fine particles and normal-temperature efficient catalytic degradation of NOx、VOCs、O3The outdoor air purification module.
Disclosure of Invention
Aiming at the defects of the existing environmental atmosphere pollution control technology, the invention provides an outdoor air purification module which comprises a low-temperature plasma dust removal module and a normal-temperature catalysis module, wherein the low-temperature plasma dust removal module and the normal-temperature catalysis module have synergistic effect, so that PM in air can be effectively removed2.5When the fine particles are mixed, the NOx and O can be efficiently removed under the conditions of normal temperature and normal pressure3And typical air pollutants such as VOCs;
the invention also provides an outdoor air purification method;
the technical scheme of the invention is as follows:
an outdoor air purification module comprises a low-temperature plasma dust removal module and a normal-temperature catalysis module, wherein the low-temperature plasma dust removal module comprises an insulating support, a sealing gasket and a plurality of discharge units; each discharge unit is fixed on the insulating support through a clamping groove, and the sealing gasket ensures that the low-temperature plasma dedusting module is good in air tightness; each discharge unit comprises a ground electrode and a high-voltage electrode which are coaxially arranged; the normal temperature catalysis module is integrated by a honeycomb ceramic catalysis unit and an axial flow fan;
according to the invention, the upper part and the lower part of the air purification module shell are respectively provided with an arc door with the radius of 220mm and the height of 52-152mm, and sealing rings are added on the periphery to ensure good air tightness;
according to the invention, the air purification module further comprises a housing 1, a bottom plate and a top plate; a low-temperature plasma dedusting module is arranged near the bottom plate, and a normal-temperature catalysis module is arranged near the top plate; an air inlet 2 is formed in the position, close to the bottom plate, of the shell 1, a coarse filter screen 3 is arranged at the air inlet, the bottom plate comprises a coarse filter screen 4, and the top plate is provided with an air outlet 13;
according to the invention, in the low-temperature plasma dedusting module, each discharge unit consists of an outer-layer metal cylinder, an inner-layer insulating cylinder bracket and a metal corona wire; the outer layer metal cylinder is a ground electrode, and the ground electrode is made of a conductive material such as stainless steel, copper, aluminum alloy and the like; the inner layer insulating cylinder is used for fixing the high-voltage electrode and is made of polytetrafluoroethylene; the high-voltage electrode can be in a linear, zigzag or needle shape, and the high-voltage electrode material is selected from conductive materials such as copper, stainless steel, tungsten, carbon fiber and the like; the metal corona wires are fixed on the inner-layer insulating cylinder bracket through screws; the outer layer metal cylinder is connected with a grounding end of a high-voltage power supply, the inner metal wire is connected with a high-voltage end of the power supply, and a discharge reaction channel is formed between the inner metal wire and the outer layer metal cylinder; the inner layer insulating support is of a solid structure so as to ensure that gas flows through the discharge reaction channel; according to the invention, the low-temperature plasma purification module shell is provided with a handle;
according to the invention, the low-temperature plasma purification module is set to three gears, and the discharge voltage is respectively 8 kV, 12 kV and 16 kV;
according to the invention, the normal-temperature catalytic module comprises a round cake-shaped honeycomb ceramic catalytic unit and an axial-flow fan;
according to the invention, the preparation method of the normal-temperature catalytic module comprises the following steps:
a. integrating a honeycomb ceramic catalytic unit and an axial flow fan into a whole, and installing 2-8 round cake-shaped honeycomb ceramics in a normal-temperature catalytic module, wherein the round cake-shaped honeycomb ceramics have the size of 50-300mm in diameter, 50-150mm in thickness and 1-5mm in pore diameter;
b. arranging an arc door with the radius of 50-300mm and the height of 52-152mm at the position of the normal-temperature catalytic module corresponding to the air purification module shell;
c. the axial flow fan is arranged at the top of the normal temperature catalysis module, the diameter is 50-300mm, and the air quantity is 500-3000m3H, sealing the interface;
according to the invention, the honeycomb ceramic catalytic unit comprises an active component manganese cerium composite oxide and a honeycomb ceramic carrier; the preparation method of the manganese-cerium composite oxide comprises the following steps:
a) adding soluble manganese salt and soluble cerium salt into deionized water, and stirring until the soluble manganese salt and the soluble cerium salt are completely dissolved to obtain a uniformly mixed solution, wherein the molar ratio of Mn to Ce is 1/10-10/1;
b) slowly adding an oxidant into the solution obtained in the step a, and stirring at room temperature until the oxidant is dissolved;
c) slowly dropwise adding a precipitator into the solution obtained in the step b to obtain a tan precipitate;
d) filtering, washing, drying and roasting to prepare the manganese-cerium composite oxide material;
according to the invention, in step a), the soluble manganese salt is selected from manganese nitrate, manganese sulfate, manganese chloride, preferably a 50% manganese nitrate solution; the soluble cerium salt is selected from cerium nitrate and ammonium cerium nitrate, preferably cerium nitrate;
according to the invention, in the step b), the oxidant is persulfate which comprises ammonium persulfate and potassium persulfate, wherein the molar ratio of the total molar weight of the oxidant to the total molar weight of manganese and cerium is 0.5-1.5;
according to the invention, in the step c), a precipitator is slowly dripped to adjust the pH value of the solution to 9-11, and the solution is stirred for 2-6 hours at a constant temperature of 50-90 ℃; the precipitant is selected from ammonia water (with concentration of 10-30%), sodium carbonate (0.5-2 mol/L), sodium bicarbonate (0.5-2 mol/L) and sodium hydroxide (0.1-0.5 mol/L);
according to the invention, in the step d), the sample is washed to be neutral, the drying temperature is 60-110 ℃, the drying time is 12 hours, the roasting temperature is 200-500 ℃, and the roasting time is 3-7 hours;
according to the invention, the preparation method of the honeycomb ceramic catalytic unit comprises the following steps:
a. adding a manganese-cerium composite oxide powder material into deionized water, stirring, performing ultrasonic treatment, and uniformly dispersing to obtain a dispersion liquid;
b. b, adding a certain amount of sol into the dispersion liquid obtained in the step a, stirring, performing ultrasonic treatment, and uniformly dispersing;
c. b, putting the honeycomb ceramic carrier into the mixed solution obtained in the step b for dipping;
d. taking out the impregnated honeycomb ceramic, and drying to obtain a honeycomb ceramic catalytic unit loaded with the manganese-cerium composite oxide;
according to the invention, in the step a, the particle size of the manganese-cerium composite oxide powder material is larger than 400 meshes, and the concentration of the dispersion liquid is 5-100 g/L;
according to the invention, in the step b, the volume ratio of the sol to the dispersion liquid is 0.01-0.1, wherein the sol is one or two of titanium dioxide sol and silicon dioxide sol;
according to the invention, in the step c, the honeycomb ceramic carrier is one or more of cordierite, mullite, silicon carbide, alumina and activated carbon, and before the honeycomb ceramic carrier is used, the honeycomb ceramic carrier is cleaned by deionized water and ethanol to remove water-soluble substances and organic substances on the surface, and is dried at the temperature of 80 ℃, and the impregnation time is 0.5-12 hours;
according to the invention, in the step d, the drying temperature is 60-120 ℃, and the drying is carried out for 1-24 hours;
according to the present invention, an air cleaning method according to the air cleaning module, the cleaning method includes the steps of:
1) the environmental pollution gas enters a low-temperature plasma purification module;
2) the air passing through the low-temperature plasma purification module enters a normal-temperature catalysis module;
according to the present invention, preferably, an air cleaning method according to the air cleaning module, the cleaning method includes the steps of:
1) the environmental pollution gas enters the low-temperature plasma purification module through the coarse filter screen;
2) the air after passing through the low-temperature plasma purification module enters a normal-temperature catalysis module, and after normal-temperature catalytic reaction of the honeycomb ceramic catalysis unit, clean air is discharged from an air outlet through an axial flow fan;
the low-temperature plasma dedusting module can remove particles and has a certain gaseous pollutant degradation function; when outside air is sucked into a low-temperature plasma discharge area by a fan, the following reactions mainly occur: (1) high-energy electrons generated in the low-temperature plasma field charge the particles, and the particles are gathered under the action of the electric field, so that the dust collection effect is realized; (2) a large number of active species (OH, O and the like) generated in the low-temperature plasma field and typical gaseous pollutants such as toluene and the like undergo a series of oxidation-reduction reactions, so that the gaseous pollutants are decomposed into non-toxic and harmless components;
the normal-temperature catalytic module efficiently and quickly degrades NOx and O in the atmosphere at room temperature3Typical gaseous pollutants such as VOCs; the manganese-cerium composite oxide in the honeycomb ceramic catalytic unit is prepared by adopting an oxidation-coprecipitation method, the preparation process is simple, the scale-up production is easy, and the selectivity of toxic byproducts generated by catalytic reaction is low; the honeycomb ceramic carrier has a large number of parallel uniform pore channels, is low in wind resistance and large in specific surface area, is beneficial to the full contact of pollutant gas and the manganese-cerium composite oxide in the pore channels, and improves the reaction efficiency; the honeycomb ceramic has high mechanical strength, is not easy to wear, is convenient to process into different sizes and has wide applicability; the honeycomb ceramic catalytic unit has low cost, does not generate secondary pollutants and is suitable for large-scale production and preparation;
the invention has the beneficial effects that:
1. the invention firstly utilizes the low-temperature plasma dust removal module to filter PM2.5When fine particles are subjected to dust removal, a normal-temperature catalytic module is added behind the dust removal module, so that low-concentration typical gaseous pollutants in the air are further eliminated, the process avoids the fine particles from blocking the active sites of the catalyst, and reduces the friction between large particles and the catalyst, thereby prolonging the service life of the catalyst; the air purification module can efficiently remove typical gaseous pollutants in the air at normal temperature and normal pressure;
2. the dust removal module adopts a low-temperature plasma technology, fine particles in the atmosphere can be effectively removed, the device can be periodically disassembled and cleaned, the maintenance is convenient, the replacement is not needed, and the cost is low;
3. the catalytic material of the invention is prepared by an improved oxidation-coprecipitation technology, and can simultaneously remove NOx, VOCs and O3Three types of polluted gases effectively purify the ambient air; the catalytic material and the honeycomb ceramic carrier are bonded and formed, the process is simple and feasible, and the large-scale popularization is easy;
4. the air purification device can be flexibly installed by combining different application carriers such as landscape lamps, advertising boards, garbage cans and the like according to the requirements of different occasions.
Drawings
FIG. 1 shows the Mn-Ce composite oxides and CeO with different Mn-Ce molar ratios2XRD spectrum of (JCPDS number 34-0394)
FIG. 2 is a SEM image of a manganese-cerium composite oxide (molar ratio Mn: Ce =5: 1)
FIG. 3 is an overall view of the air cleaning device
FIG. 4 is a schematic diagram of the internal structure of the catalytic module
FIG. 5 is an external view of the air purifying device
FIG. 6 is a schematic diagram of a discharge cell structure
Wherein, the names corresponding to the reference numbers are as follows:
1. the device comprises a shell, 2, an air inlet, 3, coarse filter screens I and 4, coarse filter screens II and 5, a low-temperature plasma dust removal module, 6, a discharge unit, 6-1, screws, 6-2, metal corona wires, 6-3, a metal cylinder, 6-4, an inner-layer insulating support, 7, an insulating support, 8, a buckle, 9, a handle, 10, a normal-temperature catalysis module, 11, a buckle, 12, an axial flow fan, 13, an air outlet, 14 and a groove.
Detailed Description
The air purification module comprises a shell 1, a low-temperature plasma dust removal module 5 and a normal-temperature catalysis module 10, wherein the low-temperature plasma dust removal module 5 comprises an insulating support 7, a sealing gasket and a plurality of discharge units 6; each discharge unit 6 is fixed on an insulating bracket 7 through a clamping groove, and a sealing gasket prevents the low-temperature plasma dust removal module from air leakage; each discharge unit comprises a ground electrode and a high-voltage electrode which are coaxially arranged; the shell of the low-temperature plasma purification module is provided with a handle; the normal temperature catalytic module 10 is integrated by a honeycomb ceramic catalytic unit and an axial flow fan 12, and the number of the honeycomb ceramic catalytic unit modules is selected and installed according to specific requirements; an arc door with the radius of 50-300mm and the height of 52-152mm is arranged at the position, corresponding to the purification module unit shell, of the honeycomb ceramic catalysis unit arranged in the normal-temperature catalysis module, and sealing rings are arranged on the periphery of the arc door; the air purification module also comprises a bottom plate and a top plate; a low-temperature plasma dedusting module 5 is arranged near the bottom plate, and a normal-temperature catalytic module 10 is arranged near the top plate; an air inlet 2 is arranged on the shell 1 close to the bottom plate, a coarse filter screen 3 is arranged at the air inlet, the bottom plate comprises a coarse filter screen 4, and the top plate is provided with an air outlet 13; the fixing seat of the spring buckle 8 is connected with the normal temperature catalytic module 10, and the normal temperature catalytic module cylinder and the low temperature plasma module cylinder are tightly and fixedly connected into a whole through a spring hasp; the groove 14 is welded with the inner wall of the normal temperature catalytic module cylinder into a whole to play a role in supporting the normal temperature catalytic module 10;
the working principle of the device is as follows:
the axial flow fan is opened, pollutants are preliminarily filtered by the coarse filter screen 3 and the coarse filter screen 4 of the air inlet 2 to remove coarse particles, and then PM in the ambient air is efficiently removed by the low-temperature plasma purification module 52.5When air enters the low-temperature plasma discharge region, the following reactions mainly occur: (1) high-energy electrons generated in the low-temperature plasma field charge the particles, and the particles are gathered under the action of the electric field, so that the dust collection effect is realized; (2) a large number of active species (OH, O and the like) generated in the low-temperature plasma field and gaseous pollutants such as toluene and the like undergo a series of oxidation-reduction reactions, so that the gaseous pollutants are decomposed into carbon dioxide and water; the filtered and dedusted polluted gas enters a normal temperature catalytic module 10, and NOx and O in the air are treated by the honeycomb ceramic catalytic unit3Gaseous pollutants such as VOCs and the like are thoroughly catalytically degraded, and the purified air is discharged through the air outlet 13;
example 1:
the preparation method of the honeycomb ceramic catalytic unit comprises the following steps:
1) the preparation method of the powder catalyst comprises the following steps:
the preparation method comprises the following steps of preparing manganese-cerium composite oxide powder with a manganese-cerium molar ratio of 1:5 by using a 50% manganese nitrate solution and cerium nitrate hexahydrate as raw materials, ammonium persulfate as an oxidant and ammonia water as a precipitator, and specifically:
a. 0.62 mL of 50% Mn (NO)3)2Solution and 5.79 g Ce (NO)3)3•6H2Adding O into 20 mL of deionized water, and stirring at room temperature to dissolve;
b. slowly add 3.65 g (NH)4)2S2O8Adding into the solution obtained in the step a, stirring and dissolving, and adding 25% NH3•H2Adjusting pH to 10 slowly, stirring at 60 deg.C for 2 hr, filtering the obtained precipitate, washing, drying at 70 deg.C for 12 hr,
c. roasting for 6 hours in a muffle furnace at 300 ℃ to obtain manganese-cerium composite oxide powder with the manganese-cerium molar ratio of 1: 5;
2) the catalyst molding preparation step:
a. grinding manganese cerium oxide powder with a molar ratio of 1:5, sieving with a 400-mesh sieve, weighing 10 g, adding into 1L deionized water, stirring for 30 min, and performing ultrasonic treatment for 10 min to uniformly disperse the powder to obtain manganese cerium oxide powder mixed solution;
b. measuring 50 mL of silica sol, adding the mixed solution of the manganese-cerium oxide powder, stirring for 30 min, and performing ultrasonic treatment for 10 min to obtain a mixed solution of the manganese-cerium oxide powder and the silica;
c. cleaning the alumina honeycomb ceramic by using deionized water and ethanol, drying at 80 ℃, soaking the pretreated alumina honeycomb ceramic in the mixed solution of the manganese cerium oxide powder and the silicon dioxide for 30 min, taking out the soaked alumina honeycomb ceramic, drying at 80 ℃, and repeating the soaking and drying for 3 times to obtain the alumina honeycomb ceramic loaded with the manganese cerium oxide powder;
example 2
A honeycomb ceramic catalyst was prepared according to the method of example 1, except that the molar ratio of manganese to cerium was 1: 1;
example 3
A honeycomb ceramic catalyst was prepared according to the method of example 1, except that the manganese-cerium molar ratio was 5: 1;
FIG. 1 shows that CeO synthesized by the method of the present invention2The catalytic material is cubic phase structure, synthesized MnOxIs in an amorphous structure; the crystallinity of the synthesized manganese-cerium composite oxide is weakened along with the increase of the Mn/Ce molar ratio, and when the manganese-cerium molar ratio is 5:1, the manganese-cerium composite oxide with an amorphous structure begins to appear;
as can be seen from FIG. 2, the manganese-cerium composite oxide synthesized by the method has a good morphology, and presents a flower ball shape formed by self-assembling thin-layer nanosheets, and the specific microscopic morphology enables the material to have a large specific surface area, so that adsorption and removal of pollutants are facilitated;
comparative example:
a honeycomb ceramic catalyst was prepared according to the method of example 1, except that the manganese-cerium composite oxide was prepared by a citric acid method, and the manganese-cerium molar ratio was 5: 1;
a. 3.10 mL of 50% Mn (NO)3)2Solution, 1.16 g Ce (NO)3)3•6H2O and 3.36 g of citric acid monohydrate are added into 20 mL of deionized water and stirred at 80 ℃ to form yellow sol;
b. drying the obtained sol at 100 ℃ for 12 h, and then roasting the sol in a muffle furnace at 300 ℃ for 6 h to obtain composite oxide powder with the manganese-cerium molar ratio of 5: 1;
application example
The air purification device module consists of a low-temperature plasma dedusting module with the lower height of 35-50 cm and a normal-temperature catalytic module with the upper height of 45-60 cm, and the whole device is a barrel with the diameter of 35 cm; the low-temperature plasma dust removal module comprises an insulating support and 8 kV, 12 kV and 16 kV discharging units with different gears; each discharge unit comprises a ground electrode and a high-voltage electrode which are coaxially arranged and fixed on the insulating bracket through a clamping groove; the low-temperature plasma dedusting module and the normal-temperature catalysis module are hermetically connected through a spring buckle; the normal temperature catalysis module comprises 2-8 round cake-shaped honeycomb ceramic catalysis units with the diameter of 50-300mm, the thickness of 50-150mm and the aperture of 1-5mm, andthe air quantity is 500-1500 m3The axial flow fan is integrated, pollutants are filtered by the low-temperature plasma dust removal module, and then Nitric Oxide (NO), methylbenzene and O are purified by the normal-temperature catalytic module3Waiting for polluting gas, and finally discharging clean gas flow through a top fan;
under the conditions of normal temperature and normal pressure, NO, toluene and O are used3The mixed gas was subjected to performance tests in the air purification modules equipped with the honeycomb ceramic catalytic units of examples 1 to 3 and comparative example, respectively; the NO concentration in the mixed gas is 500 ppb, the toluene concentration is 200 ppb, and O3The concentration is 500 ppb, and the air quantity of the fan is 1000 m3The low-temperature plasma discharge voltage is 12 kV, and the overall capability of the air purification module in dedusting and degrading polluted gas is tested; the experimental results are shown in table 1;
TABLE 1 typical air contaminant removal Rate
As can be seen from Table 1, the outdoor air purification module of the present invention can not only effectively remove PM in air2.5When the fine particles are mixed, the NOx and O can be efficiently removed under the conditions of normal temperature and normal pressure3And typical air pollutants such as VOCs; compared with the existing manganese-cerium composite oxide catalyst prepared by lemon hair, the manganese-cerium composite oxide catalyst prepared by the improved oxidation-coprecipitation method has better effect of removing NOx and O3And the effects of typical air pollutants such as VOCs;
it should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides an outdoor air purification module which characterized in that: the air purification module comprises a low-temperature plasma dust removal module and a normal-temperature catalysis module, wherein the low-temperature plasma dust removal module comprises an insulating support, a sealing gasket and a plurality of discharge units; each discharge unit is fixed on the insulating support through a clamping groove, and the sealing gasket ensures that the low-temperature plasma dedusting module is good in air tightness; each discharge unit comprises a ground electrode and a high-voltage electrode which are coaxially arranged; the normal temperature catalysis module is integrated by a honeycomb ceramic catalysis unit and an axial flow fan;
the honeycomb ceramic catalytic unit comprises an active component manganese cerium composite oxide and a honeycomb ceramic carrier; the preparation method of the manganese-cerium composite oxide comprises the following steps:
a) adding soluble manganese salt and soluble cerium salt into deionized water, and stirring until the soluble manganese salt and the soluble cerium salt are completely dissolved to obtain a uniformly mixed solution, wherein the molar ratio of Mn to Ce is 1/10-10/1;
b) slowly adding an oxidant into the solution obtained in the step a, and stirring at room temperature until the oxidant is dissolved;
c) slowly dropwise adding a precipitator into the solution obtained in the step b to obtain a tan precipitate;
d) filtering, washing, drying and roasting to prepare the manganese-cerium composite oxide material;
wherein the oxidant is ammonium persulfate or potassium persulfate.
2. The outdoor air purification module according to claim 1, wherein: the air purification module also comprises a shell (1), a bottom plate and a top plate; a low-temperature plasma dedusting module is arranged near the bottom plate, and a normal-temperature catalysis module is arranged near the top plate; the shell (1) is close to bottom plate department and sets up air inlet (2), and air inlet department sets up coarse filter screen (3), the bottom plate includes coarse filter screen (4), the roof sets up gas outlet (13).
3. The outdoor air purification module according to claim 1, wherein: the upper part and the lower part of the air purification module shell are respectively provided with an arc door with the radius of 220mm and the height of 52-152mm, and sealing rings are added on the periphery to ensure good air tightness; in the low-temperature plasma dedusting module, each discharge unit consists of an outer-layer metal cylinder, an inner-layer insulating support and a metal corona wire; the outer layer metal cylinder is a ground electrode, and the ground electrode material is selected from conductive materials, such as stainless steel, copper and aluminum alloy; the inner layer insulation support is used for fixing the high-voltage electrode, and the inner layer insulation material is polytetrafluoroethylene; the high-voltage electrode can be in a linear, zigzag or needle shape, and the high-voltage electrode material is selected from conductive materials such as copper, stainless steel, tungsten and carbon fiber; the metal corona wires are fixed on the inner layer insulating support through screws; the outer metal cylinder is connected with a grounding end of a high-voltage power supply, the inner metal wire is connected with a high-voltage end of the power supply, and a discharge reaction channel is formed between the inner metal corona wire and the outer metal cylinder; the inner layer insulating support is of a solid structure so as to ensure that gas flows through the discharge reaction channel; and a handle is arranged on the shell of the low-temperature plasma dust removal module.
4. The outdoor air purification module according to claim 1, wherein: 2-8 round cake-shaped honeycomb ceramic catalytic units are arranged in the normal-temperature catalytic module, the diameter of each round cake-shaped honeycomb ceramic catalytic unit is 50-300mm, the thickness of each round cake-shaped honeycomb ceramic catalytic unit is 50-150mm, and the pore diameter of each round cake-shaped honeycomb ceramic catalytic unit is 1-5 mm.
5. The outdoor air purification module according to claim 1, wherein: the preparation method of the normal-temperature catalytic module comprises the following steps:
a. the honeycomb ceramic catalytic unit and the axial flow fan are integrated into a whole, 2-8 round cake-shaped honeycomb ceramic catalytic units are arranged in the normal-temperature catalytic module, the diameter of each round cake-shaped honeycomb ceramic catalytic unit is 50-300mm, the thickness of each round cake-shaped honeycomb ceramic catalytic unit is 50-150mm, and the pore diameter of each round cake-shaped honeycomb ceramic catalytic unit is 1-5 mm;
b. arranging an arc door with the radius of 50-300mm and the height of 52-152mm at the position of the normal-temperature catalytic module corresponding to the air purification module shell;
c. the axial flow fan is arranged at the top of the normal temperature catalysis module, the diameter is 50-300mm, and the air quantity is 500-3000m3And h, sealing the interface.
6. The outdoor air purification module according to claim 1, wherein in step a), the soluble manganese salt is selected from manganese nitrate, manganese sulfate, manganese chloride; the soluble cerium salt is selected from cerium nitrate and ammonium cerium nitrate; in the step b), the oxidant is ammonium persulfate or potassium persulfate, wherein the molar ratio of the total molar weight of the oxidant to the manganese and cerium is 0.5-1.5; in the step c), a precipitator is slowly dripped to adjust the pH value of the solution to 9-11, and the solution is stirred for 2-6 hours at a constant temperature of 50-90 ℃; the precipitant is selected from 10-30% ammonia water, 0.5-2mol/L sodium carbonate, 0.5-2mol/L sodium bicarbonate, 0.1-0.5mol/L sodium hydroxide; in the step d), the sample is washed to be neutral, the drying temperature is 60-110 ℃, the drying time is 12 hours, the roasting temperature is 200-500 ℃, and the roasting time is 3-7 hours.
7. The outdoor air purification module according to claim 6, wherein the soluble manganese salt is a 50% manganese nitrate solution; the soluble cerium salt is cerium nitrate.
8. The outdoor air purification module according to any one of claims 1 to 5, wherein the honeycomb ceramic catalytic unit is prepared by a method comprising the steps of:
a. adding a manganese-cerium composite oxide powder material into deionized water, stirring, performing ultrasonic treatment, and uniformly dispersing to obtain a dispersion liquid;
b. b, adding a certain amount of sol into the dispersion liquid obtained in the step a, stirring, performing ultrasonic treatment, and uniformly dispersing;
c. b, putting the honeycomb ceramic carrier into the mixed solution obtained in the step b for dipping;
d. and taking out the impregnated honeycomb ceramic, and drying to obtain the honeycomb ceramic catalytic unit loaded with the manganese-cerium composite oxide.
9. The outdoor air purification module according to claim 8, wherein in step a, the particle size of the manganese-cerium composite oxide powder material is larger than 400 meshes, and the concentration of the dispersion liquid is 5-100 g/L; in the step b, the volume ratio of the sol to the dispersion liquid is 0.01-0.1, wherein the sol is one or two of titanium dioxide sol and silicon dioxide sol; in the step c, the honeycomb ceramic carrier is one or more of cordierite, mullite, silicon carbide, alumina and active carbon, and is cleaned by deionized water and ethanol before being used, water-soluble substances and organic matters on the surface are removed, and the honeycomb ceramic carrier is dried at the temperature of 80 ℃ and is soaked for 0.5 to 12 hours; in the step d, the drying temperature is 60-120 ℃, and the drying time is 1-24 hours.
10. An air cleaning method of an outdoor air cleaning module according to any one of claims 2 to 9, comprising:
1) the environmental pollution gas enters the low-temperature plasma dedusting module through the coarse filter screen;
2) and the air after passing through the low-temperature plasma dust removal module enters a normal-temperature catalytic module, and after the normal-temperature catalytic reaction of the honeycomb ceramic catalytic unit occurs, clean air is discharged from an air outlet through an axial flow fan.
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