CN113181974A - Bismuth oxide-carbon nitride-porphyrin composite photocatalyst and preparation method thereof - Google Patents
Bismuth oxide-carbon nitride-porphyrin composite photocatalyst and preparation method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 55
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- 229910000416 bismuth oxide Inorganic materials 0.000 claims abstract description 34
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims abstract description 34
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- 239000002245 particle Substances 0.000 claims description 3
- JHXKRIRFYBPWGE-UHFFFAOYSA-K bismuth chloride Chemical compound Cl[Bi](Cl)Cl JHXKRIRFYBPWGE-UHFFFAOYSA-K 0.000 claims description 2
- 229910000380 bismuth sulfate Inorganic materials 0.000 claims description 2
- BEQZMQXCOWIHRY-UHFFFAOYSA-H dibismuth;trisulfate Chemical compound [Bi+3].[Bi+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BEQZMQXCOWIHRY-UHFFFAOYSA-H 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims 1
- 230000001699 photocatalysis Effects 0.000 abstract description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 14
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- 230000000052 comparative effect Effects 0.000 description 6
- 229920000877 Melamine resin Polymers 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 4
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- 230000015556 catabolic process Effects 0.000 description 3
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- 238000005215 recombination Methods 0.000 description 3
- 230000006798 recombination Effects 0.000 description 3
- 238000002390 rotary evaporation Methods 0.000 description 3
- STZCRXQWRGQSJD-UHFFFAOYSA-M sodium;4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate Chemical compound [Na+].C1=CC(N(C)C)=CC=C1N=NC1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-UHFFFAOYSA-M 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- VCUVETGKTILCLC-UHFFFAOYSA-N 5,5-dimethyl-1-pyrroline N-oxide Chemical compound CC1(C)CCC=[N+]1[O-] VCUVETGKTILCLC-UHFFFAOYSA-N 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
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- 239000004202 carbamide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
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- 231100000719 pollutant Toxicity 0.000 description 1
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- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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- B01J35/39—
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- 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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/0234—Nitrogen-, phosphorus-, arsenic- or antimony-containing compounds
- B01J31/0235—Nitrogen containing compounds
- B01J31/0254—Nitrogen containing compounds on mineral substrates
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- B01J35/40—
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- B01J35/51—
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/40—Organic compounds containing sulfur
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Abstract
The invention discloses a bismuth oxide-carbon nitride-porphyrin composite photocatalyst and a preparation method thereof. The bismuth oxide-carbon nitride-porphyrin composite photocatalyst comprises bismuth oxide microspheres and porphyrin-sensitized carbon nitride loaded on the bismuth oxide microspheres, and the preparation method comprises the following steps: 1) dispersing soluble bismuth salt in alcohol-ketone mixed solution, and carrying out solvothermal reaction to obtain bismuth oxide microspheres; 2) dispersing carbon nitride and porphyrin in ethanol, and reacting to obtain porphyrin-sensitized carbon nitride; 3) dispersing the bismuth oxide microspheres and the porphyrin-sensitized carbon nitride in water, and reacting to obtain the bismuth oxide-carbon nitride-porphyrin composite photocatalyst. The bismuth oxide-carbon nitride-porphyrin composite photocatalyst has excellent photocatalytic performance, and is simple in preparation method, mild in preparation conditions, low in cost and suitable for large-area popularization and application.
Description
Technical Field
The invention relates to the technical field of photocatalytic materials, in particular to a bismuth oxide-carbon nitride-porphyrin composite photocatalyst and a preparation method thereof.
Background
With the development of global economy, the problem of environmental pollution is prominent, and among the numerous methods for solving the problem of environmental pollution, the photocatalytic technology has become one of the most potential methods for solving the problem of environmental pollution due to the advantages of low cost, no secondary pollution and the like, and the development of efficient photocatalysts has become a hotspot for research.
Titanium dioxide and bismuth oxide are two common photocatalysts, but both suffer from significant drawbacks, such as: the titanium dioxide has the advantages of no toxicity, no pollution, sanitation, safety, good photochemical stability and the like, plays an important role in environmental purification, but has large forbidden bandwidth and has a photoresponse effect only in an ultraviolet region with the wavelength below 400 nm; the forbidden band width of bismuth oxide is 2.8eV, the bismuth oxide has visible light activity and is concerned with, but the application of the bismuth oxide is limited because the rapid recombination of self-photoproduction electron-hole is serious and the photocatalysis performance is general.
Therefore, in order to meet the practical application requirements, it is necessary to develop a photocatalyst having more excellent overall properties.
Disclosure of Invention
The invention aims to provide a bismuth oxide-carbon nitride-porphyrin composite photocatalyst and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
a bismuth oxide-carbon nitride-porphyrin composite photocatalyst comprises bismuth oxide microspheres and porphyrin-sensitized carbon nitride loaded on the bismuth oxide microspheres.
Preferably, the particle size of the bismuth oxide microspheres is 1-3 μm.
The preparation method of the bismuth oxide-carbon nitride-porphyrin composite photocatalyst comprises the following steps:
1) dispersing soluble bismuth salt in alcohol-ketone mixed solution, and carrying out solvothermal reaction to obtain bismuth oxide microspheres;
2) dispersing carbon nitride and porphyrin in ethanol, and reacting to obtain porphyrin-sensitized carbon nitride;
3) dispersing the bismuth oxide microspheres and the porphyrin-sensitized carbon nitride in water, and reacting to obtain the bismuth oxide-carbon nitride-porphyrin composite photocatalyst.
Preferably, the soluble bismuth salt in the step 1) is at least one of bismuth nitrate, bismuth trichloride and bismuth sulfate.
Preferably, the alcohol in step 1) is at least one of ethylene glycol and glycerol.
Preferably, the ketone in step 1) is at least one of acetone, butanone and 2-pentanone.
Preferably, the volume ratio of the alcohol to the ketone in the alcohol-ketone mixed solution in the step 1) is 1: 1-1: 4.
Preferably, the solvothermal reaction in the step 1) is carried out at 140-160 ℃, and the reaction time is 4-6 h.
Preferably, the carbon nitride in step 2) is prepared by the following method: heating the carbon nitride precursor to 500-600 ℃ at the speed of 0.5-2 ℃/min, keeping the temperature for 3-5 h, grinding, heating to 400-500 ℃ at the speed of 5-10 ℃/min, and keeping the temperature for 2-3 h to obtain the carbon nitride.
Preferably, the carbon nitride precursor is at least one of melamine, dicyandiamide and urea.
Preferably, the amount of the porphyrin in the step 2) is 0.05-0.5% of the mass of the carbon nitride.
Preferably, the reaction in the step 2) is carried out at normal temperature, and the reaction time is 6-12 h.
Preferably, the mass ratio of the bismuth oxide microspheres in the step 3) to the porphyrin-sensitized carbon nitride is 5: 1-20: 1.
Preferably, the reaction in the step 3) is carried out at 60-90 ℃, and the reaction time is 1-3 h.
The invention has the beneficial effects that: the bismuth oxide-carbon nitride-porphyrin composite photocatalyst has excellent photocatalytic performance, and is simple in preparation method, mild in preparation conditions, low in cost and suitable for large-area popularization and application.
Specifically, the method comprises the following steps:
1) the bismuth oxide-carbon nitride-porphyrin composite photocatalyst can form a self-driven Fenton system by utilizing hydrogen peroxide generated by carbon nitride-porphyrin under visible light, so that more hydroxyl radicals can be generated;
2) the bismuth oxide in the bismuth oxide-carbon nitride-porphyrin composite photocatalyst has visible light absorption capacity, and generated photo-generated electrons can react with hydrogen peroxide and then be used for subsequent degradation reaction, so that the recombination efficiency of electrons and holes generated in the bismuth oxide can be reduced, and the photocatalytic performance can be improved;
3) porphyrin in the bismuth oxide-carbon nitride-porphyrin composite photocatalyst has strong light absorption capacity, the electron-hole separation efficiency of carbon nitride can be improved, and the hydrogen peroxide generation capacity of carbon nitride sensitized by porphyrin is obviously improved.
Drawings
Fig. 1 is an SEM image of the bismuth oxide-carbon nitride-porphyrin composite photocatalyst of example 2.
Fig. 2 is a photoluminescence spectrum of the bismuth oxide-carbon nitride-porphyrin composite photocatalyst of example 2 and the bismuth oxide-carbon nitride composite photocatalyst of the comparative example.
FIG. 3 is a graph of the production of hydrogen peroxide in water by visible light exposure for carbon nitride and porphyrin-sensitized carbon nitride of example 2 over time.
FIG. 4 is an electron spin resonance spectrum of the hydroxyl radical DMPO after the bismuth oxide-carbon nitride-porphyrin composite photocatalyst of example 2 and the bismuth oxide-carbon nitride composite photocatalyst of the comparative example were irradiated with visible light for 10min in water.
Detailed Description
The invention will be further explained and illustrated with reference to specific examples.
Example 1:
a bismuth oxide-carbon nitride-porphyrin composite photocatalyst and a preparation method thereof comprise the following steps:
1) dissolving 0.96g of bismuth nitrate in an alcohol-ketone mixed solution consisting of 25mL of ethylene glycol and 25mL of acetone, transferring the solution into a reaction kettle with a polytetrafluoroethylene lining, reacting for 4 hours at 160 ℃, filtering, washing the filtered solid with deionized water for 3 times, and drying at 60 ℃ to obtain bismuth oxide microspheres;
2) adding 5g of melamine into a muffle furnace, heating to 550 ℃ at the speed of 1 ℃/min, calcining for 4h, grinding, heating to 500 ℃ at the speed of 5 ℃/min, and calcining for 2h to obtain carbon nitride;
3) dispersing 0.3g of carbon nitride in 30mL of ethanol, adding 1.5mL of porphyrin solution with the concentration of 0.2mg/mL, reacting at normal temperature for 12h, and performing rotary evaporation to obtain porphyrin-sensitized carbon nitride;
4) dispersing 0.3g of bismuth oxide and 15mg of porphyrin-sensitized carbon nitride in 50mL of deionized water, reacting for 2h at 90 ℃, filtering, washing the filtered solid with deionized water, and drying at 60 ℃ to obtain the bismuth oxide-carbon nitride-porphyrin composite photocatalyst.
Example 2:
a bismuth oxide-carbon nitride-porphyrin composite photocatalyst and a preparation method thereof comprise the following steps:
1) dissolving 0.96g of bismuth nitrate in an alcohol-ketone mixed solution consisting of 25mL of ethylene glycol and 50mL of acetone, transferring the solution into a reaction kettle with a polytetrafluoroethylene lining, reacting for 6 hours at 160 ℃, filtering, washing the filtered solid with deionized water for 3 times, and drying at 60 ℃ to obtain bismuth oxide microspheres;
2) adding 5g of melamine into a muffle furnace, heating to 600 ℃ at the speed of 2 ℃/min, calcining for 4h, grinding, heating to 450 ℃ at the speed of 5 ℃/min, and calcining for 2h to obtain carbon nitride;
3) dispersing 0.3g of carbon nitride in 30mL of ethanol, adding 2mL of porphyrin solution with the concentration of 0.3mg/mL, reacting for 8 hours at normal temperature, and performing rotary evaporation to obtain porphyrin-sensitized carbon nitride;
4) dispersing 0.3g of bismuth oxide and 30mg of porphyrin-sensitized carbon nitride in 50mL of deionized water, reacting for 3h at 90 ℃, filtering, washing the filtered solid with deionized water, and drying at 60 ℃ to obtain the bismuth oxide-carbon nitride-porphyrin composite photocatalyst.
Example 3:
a bismuth oxide-carbon nitride-porphyrin composite photocatalyst and a preparation method thereof comprise the following steps:
1) dissolving 0.96g of bismuth nitrate in an alcohol-ketone mixed solution consisting of 20mL of ethylene glycol and 60mL of acetone, transferring the solution into a reaction kettle with a polytetrafluoroethylene lining, reacting for 6 hours at 160 ℃, filtering, washing the filtered solid with deionized water for 3 times, and drying at 60 ℃ to obtain bismuth oxide microspheres;
2) adding 5g of melamine into a muffle furnace, heating to 500 ℃ at the speed of 1 ℃/min, calcining for 5h, grinding, heating to 400 ℃ at the speed of 10 ℃/min, and calcining for 3h to obtain carbon nitride;
3) dispersing 0.3g of carbon nitride in 30mL of ethanol, adding 4mL of porphyrin solution with the concentration of 0.25mg/mL, reacting at normal temperature for 12h, and performing rotary evaporation to obtain porphyrin-sensitized carbon nitride;
4) dispersing 0.3g of bismuth oxide and 30mg of porphyrin-sensitized carbon nitride in 50mL of deionized water, reacting for 2h at 90 ℃, filtering, washing the filtered solid with deionized water, and drying at 60 ℃ to obtain the bismuth oxide-carbon nitride-porphyrin composite photocatalyst. Comparative example:
the preparation method of the bismuth oxide-carbon nitride composite photocatalyst comprises the following steps:
1) dissolving 0.96g of bismuth nitrate in an alcohol-ketone mixed solution consisting of 25mL of ethylene glycol and 50mL of acetone, transferring the solution into a reaction kettle with a polytetrafluoroethylene lining, reacting for 6 hours at 160 ℃, filtering, washing the filtered solid with deionized water for 3 times, and drying at 60 ℃ to obtain bismuth oxide microspheres;
2) adding 5g of melamine into a muffle furnace, heating to 550 ℃ at the speed of 1 ℃/min, calcining for 4h, grinding, heating to 500 ℃ at the speed of 5 ℃/min, and calcining for 2h to obtain carbon nitride;
3) dispersing 0.3g of bismuth oxide and 30mg of carbon nitride in 50mL of deionized water, reacting for 2h at 90 ℃, filtering, washing the filtered solid with deionized water, and drying at 60 ℃ to obtain the bismuth oxide-carbon nitride composite photocatalyst.
And (3) performance testing:
1) degradation performance test of the photocatalyst:
preparing a methyl orange solution with the concentration of 20mg/L as a simulated pollutant, dispersing a photocatalyst in the methyl orange solution, stirring in a dark environment to reach adsorption balance, measuring the absorbance of the methyl orange solution by using an ultraviolet-visible spectrophotometer and calculating the initial concentration c of the methyl orange0Then, the solution is irradiated for 1 hour under visible light by using a 300W xenon lamp and a 420nm light-cutting sheet, the absorbance of the solution is measured by using an ultraviolet-visible spectrophotometer, the final concentration c of the methyl orange is calculated, and the degradation rate of the photocatalyst to the methyl orange is finally measured (1-c/c)0)×100％。
Through tests, the bismuth oxide-carbon nitride-porphyrin composite photocatalyst of the examples 1-3 and the bismuth oxide-carbon nitride composite photocatalyst of the comparative example are subjected to a photocatalytic degradation test on methyl orange, visible light is irradiated for 1 hour, and the degradation rates of the catalysts on the methyl orange are 56.7%, 73.6%, 69.4% and 47.5% in sequence.
2) A Scanning Electron Microscope (SEM) image of the bismuth oxide-carbon nitride-porphyrin composite photocatalyst of example 2 is shown in fig. 1, photoluminescence spectra of the bismuth oxide-carbon nitride-porphyrin composite photocatalyst of example 2 and the bismuth oxide-carbon nitride composite photocatalyst of comparative example are shown in fig. 2, a change curve of hydrogen peroxide yield with time of the bismuth oxide-carbon nitride-porphyrin composite photocatalyst of example 2 and the porphyrin-sensitized carbon nitride in water under visible light irradiation is shown in fig. 3, and an electron spin resonance spectrum of hydroxyl radical DMPO after the bismuth oxide-carbon nitride-porphyrin composite photocatalyst of example 2 and the bismuth oxide-carbon nitride composite photocatalyst of comparative example are irradiated with visible light for 10min in water is shown in fig. 4.
As can be seen from fig. 1: the particle size of the bismuth oxide microspheres is 1-3 μm, and the sheet-shaped substance on the surfaces of the bismuth oxide microspheres is the composite carbon nitride-porphyrin, which indicates that the bismuth oxide-carbon nitride-porphyrin composite photocatalyst is successfully prepared.
As can be seen from fig. 2: the photoluminescence intensity of the bismuth oxide-carbon nitride-porphyrin composite photocatalyst is obviously lower than that of the bismuth oxide-carbon nitride composite photocatalyst, which shows that the recombination of photo-generated electron-hole pairs is obviously reduced.
As can be seen from fig. 3 and 4: the yield of hydrogen peroxide (5.29 μ M) of porphyrin-sensitized carbon nitride in 60min is about 6.45 times that of carbon nitride (0.82 μ M), and more hydrogen peroxide consumes more photogenerated electrons in bismuth oxide and generates more hydroxyl radicals in the self-driven fenton system of bismuth oxide and carbon nitride-porphyrin, which corresponds to the conclusion of fig. 2 on one hand and the detection of higher hydroxyl radical peak intensity in the bismuth oxide-carbon nitride-porphyrin composite photocatalyst in fig. 4 on the other hand.
In conclusion, the bismuth oxide-carbon nitride-porphyrin composite photocatalyst can form a self-driven Fenton system, so that the bismuth oxide-carbon nitride-porphyrin composite photocatalyst has excellent photocatalytic performance, and the preparation method of the bismuth oxide-carbon nitride-porphyrin composite photocatalyst has the advantages of simple steps, low cost, mild preparation conditions and easiness in industrial production.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The bismuth oxide-carbon nitride-porphyrin composite photocatalyst is characterized by comprising bismuth oxide microspheres and porphyrin-sensitized carbon nitride loaded on the bismuth oxide microspheres.
2. The bismuth oxide-carbon nitride-porphyrin composite photocatalyst as claimed in claim 1, wherein: the particle size of the bismuth oxide microspheres is 1-3 μm.
3. The preparation method of the bismuth oxide-carbon nitride-porphyrin composite photocatalyst as claimed in claim 1 or 2, characterized by comprising the following steps:
1) dispersing soluble bismuth salt in alcohol-ketone mixed solution, and carrying out solvothermal reaction to obtain bismuth oxide microspheres;
2) dispersing carbon nitride and porphyrin in ethanol, and reacting to obtain porphyrin-sensitized carbon nitride;
3) dispersing the bismuth oxide microspheres and the porphyrin-sensitized carbon nitride in water, and reacting to obtain the bismuth oxide-carbon nitride-porphyrin composite photocatalyst.
4. The method for preparing the bismuth oxide-carbon nitride-porphyrin composite photocatalyst according to claim 3, wherein the method comprises the following steps: the soluble bismuth salt in the step 1) is at least one of bismuth nitrate, bismuth trichloride and bismuth sulfate; the alcohol in the step 1) is at least one of ethylene glycol and glycerol; the ketone in the step 1) is at least one of acetone, butanone and 2-pentanone.
5. The method for preparing the bismuth oxide-carbon nitride-porphyrin composite photocatalyst according to claim 3 or 4, wherein the method comprises the following steps: the volume ratio of alcohol to ketone in the alcohol-ketone mixed solution in the step 1) is 1: 1-1: 4.
6. The method for preparing the bismuth oxide-carbon nitride-porphyrin composite photocatalyst according to claim 3 or 4, wherein the method comprises the following steps: the solvent thermal reaction in the step 1) is carried out at 140-160 ℃, and the reaction time is 4-6 h.
7. The method for preparing the bismuth oxide-carbon nitride-porphyrin composite photocatalyst according to claim 3, wherein the method comprises the following steps: the amount of porphyrin in the step 2) is 0.05-0.5% of the mass of carbon nitride.
8. The method for preparing the bismuth oxide-carbon nitride-porphyrin composite photocatalyst according to any one of claims 3, 4 and 7, wherein: the reaction in the step 2) is carried out at normal temperature, and the reaction time is 6-12 h.
9. The method for preparing the bismuth oxide-carbon nitride-porphyrin composite photocatalyst according to claim 3, wherein the method comprises the following steps: the mass ratio of the bismuth oxide microspheres to the porphyrin-sensitized carbon nitride in the step 3) is 5: 1-20: 1.
10. The method for preparing the bismuth oxide-carbon nitride-porphyrin composite photocatalyst according to any one of claims 3, 4, 7 and 9, wherein: the reaction in the step 3) is carried out at the temperature of 60-90 ℃ for 1-3 h.
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| CN115254026B (en) * | 2022-08-23 | 2023-12-22 | 邯郸市赵都精细化工有限公司 | Bismuth-based adsorption chlorine removal material and preparation method and application thereof |
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