CN111036285A - Photocatalyst of nitrogen modified perovskite composite molecular sieve and preparation method and application method thereof - Google Patents

Photocatalyst of nitrogen modified perovskite composite molecular sieve and preparation method and application method thereof Download PDF

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CN111036285A
CN111036285A CN201911291747.6A CN201911291747A CN111036285A CN 111036285 A CN111036285 A CN 111036285A CN 201911291747 A CN201911291747 A CN 201911291747A CN 111036285 A CN111036285 A CN 111036285A
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molecular sieve
aromatic compound
nitrogen
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吴敏
刘颖
厉明升
王传传
李志豪
赵颖丹
张仲琨
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Southeast University
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Abstract

The invention discloses a photocatalyst of a nitrogen modified perovskite composite molecular sieve, a preparation method and an application method thereof, wherein the photocatalyst is N-LaFeO3@ MCM-41, the preparation method of the photocatalyst is that the molar ratio of 1:1: 1-3: 3-7, weighing lanthanum nitrate, ferric nitrate, urea and MCM-41, adding water to dissolve, and stirring to form solution A; dissolving a complexing agent in water, and stirring to form a solution B, wherein the molar ratio of the complexing agent to lanthanum nitrate is1-4: 1; and slowly adding the solution B into the solution A to polymerize into sol, drying and calcining to obtain the photocatalyst, and providing an application method of the photocatalyst for treating the aromatic compound organic wastewater. The photocatalyst can efficiently degrade the aromatic compound organic wastewater, the preparation method is convenient to operate and low in cost, and the photocatalyst is applied to the aromatic compound organic wastewater, does not produce secondary pollution, is energy-saving and environment-friendly.

Description

Photocatalyst of nitrogen modified perovskite composite molecular sieve and preparation method and application method thereof
Technical Field
The invention relates to a photocatalyst and a preparation method and an application method thereof, in particular to a photocatalyst of a nitrogen modified perovskite composite molecular sieve and a preparation method and an application method thereof.
Background
Aromatic compounds are compounds with benzene ring structure, and have stable structure, difficult decomposition and strong toxicity. Aromatic compounds are derived from, on the one hand, lignin and secondary metabolic processes of higher plants and, on the other hand, from various chemical products synthesized industrially, such as pesticides, herbicides, dyes, explosives, etc. Aromatic compounds such as benzene, benzonitrile and phenol are produced in an amount of millions of tons per year, and these compounds are widely used for fuels and industrial solvents, and they are used as initial raw materials for producing medicines, agricultural chemicals, plastic polymers, explosives and other daily necessities together with polycyclic aromatic compounds and chlorobiphenyl. They can enter the environment through various ways, and the artificially synthesized products are difficult to be degraded by microorganisms in the environment, are inevitably leaked into the environment during utilization, cause serious pollution to water, soil and atmosphere, can cause serious damage to the human body, and generate canceration, mutation and distortion effects. Therefore, the treatment of the aromatic compound waste water is a very important problem.
The existing aromatic compound wastewater treatment methods mainly comprise physical treatment methods, chemical treatment methods, biological treatment methods and other methods such as low-temperature plasma technology, nano photocatalysis technology and the like. Although the biodegradation method has a mature treatment process and low cost, the biodegradation method is only suitable for treating low-concentration aromatic compounds; the chemical oxidation and advanced oxidation technology method is a method of adding a certain amount of oxidant (oxygen, hydrogen peroxide, ozone, etc.) into wastewater, generating strong oxidant under a certain condition, so that aromatic compounds are oxidized and degraded, and finally completely mineralized into carbon dioxide and water. Although the method has good treatment effect, the use of the method is influenced because the recovery of the oxidant is difficult and the operation cost is expensive; the adsorption method is an effective method for treating aromatic compounds, and mainly utilizes porous materials to adsorb pollutants in wastewater, the pollutants in the wastewater can enter the inside of the adsorbent through the pore structure of the adsorbent, and then the adsorbent can be treated to a certain extent, so that the adsorbent can be recycled. But the equipment investment is large, the reutilization property of the adsorbent is low and the regeneration problem needs to be solved; the cold plasma wastewater treatment technology is a brand-new wastewater treatment technology integrating functions of high-energy electron radiation, ozone oxidation, ultraviolet photolysis and the like, but the method has higher energy consumption; the nano photocatalysis technology has mild reaction conditions, can directly and indirectly convert pollutants into CO2, water and other harmless substances by utilizing conditions such as ultraviolet light, sunlight and the like, has low energy consumption and cannot generate secondary pollution. The common photocatalyst such as TiO2 has the defects of wide forbidden band width, incapability of fully utilizing visible light, low quantum efficiency and the like, while the perovskite catalyst has the defects of narrow forbidden band width and small band gap and is a better photocatalyst, but the perovskite has the problem of high electron-hole recombination rate and has poor response to wide-range visible light.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a high-efficiency, convenient, energy-saving and environment-friendly photocatalyst of a nitrogen-modified perovskite composite molecular sieve, a preparation method of the photocatalyst and an application method of the photocatalyst.
The technical scheme is as follows: the photocatalyst of the nitrogen modified perovskite composite molecular sieve is N-LaFeO3@MCM-41。
The preparation method of the photocatalyst comprises the following steps:
(1) according to the mol ratio of 1:1: 1-3: 3-7, weighing lanthanum nitrate, ferric nitrate, urea and MCM-41, adding water to dissolve, and stirring to form solution A;
(2) dissolving a complexing agent in water, and stirring to form a solution B, wherein the molar ratio of the complexing agent to lanthanum nitrate is 1-4: 1;
(3) and slowly adding the solution B into the solution A to polymerize sol, drying and calcining to obtain the photocatalyst.
Further, in the step (1), a soft template agent is added into the solution A.
Preferably, the soft template agent is Cetyl Trimethyl Ammonium Bromide (CTAB), and the size of the material is controlled and the specific surface area of the material is increased.
Further, in the step (2), the complexing agent is any one of tartaric acid, malic acid, aspartic acid or lactic acid.
The application method of the photocatalyst of the nitrogen modified perovskite composite molecular sieve for degrading the aromatic compound organic wastewater comprises the following steps: adding a photocatalyst, a hole trapping agent and aromatic compound organic wastewater into a photocatalytic reactor to carry out photocatalytic reaction.
Further, the aromatic compound is one of benzonitrile, p-methoxybenzonitrile, terephthalonitrile or bisphenol A.
Furthermore, the volume ratio of the hole trapping agent to the aromatic compound is 1:8-16, and the adding amount of the photocatalyst in each liter of the mixture of the hole trapping agent and the aromatic compound is 0.2-0.6 g.
Further, dark adsorption is performed prior to the photocatalytic reaction.
Further, the hole trapping agent is one of methanol or ammonium oxalate.
Further, the photocatalytic reaction provides visible light through a xenon lamp.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) the photocatalyst reduces the forbidden bandwidth of the catalyst by using nitrogen modified perovskite, and improves the absorbable area of visible light, thereby improving the efficiency of degrading aromatic compound organic wastewater; the molecular sieve MCM-41 is used as a carrier, so that the contact area of the catalyst and the organic wastewater is obviously increased, and the rapid catalytic degradation is promoted;
(2) the preparation method of the photocatalyst is convenient to operate and low in cost; the method has the advantages of simple equipment, flexible process, high purity of the material and easy control of the particle size; the method can utilize chemical reaction in solution to uniformly mix raw materials at a molecular level, thereby obtaining a product with high uniformity, wherein the uniformity can reach the size of molecules or atoms;
(3) the photocatalyst does not use various oxidants in the application process, so that the problem of oxidant recovery is not needed to be worried about, and the cost is greatly saved; no sludge and secondary pollution are generated; the reaction is carried out at low temperature and normal pressure, and the visible light is fully utilized, so that the energy is saved.
Drawings
FIG. 1 is a photocatalytic degradation mechanism of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Example 1
2.1646g of lanthanum nitrate, 2.02g of ferric nitrate, 0.3g of urea and 0.9012g of MCM-41 are weighed according to the molar ratio of 1:1:1:3, are added into a three-neck flask, and are dissolved in 50mL of distilled water and are uniformly stirred to form solution A; according to the weight ratio of tartaric acid: 0.7505g of tartaric acid is added into lanthanum nitrate with the molar ratio of 1:1, 15mL of distilled water is added, and the solution is dissolved and stirred uniformly to form solution B. Slowly adding the solution B into the solution A under stirring, reacting and polymerizing the solution B into sol in water bath at the temperature of 80 ℃, drying the sol overnight to obtain dry gel, and calcining the dry gel at the temperature of 700 ℃ for 4 hours at the speed of 2 ℃/min to obtain the catalyst N-LaFeO3@MCM-41-1。
Adding N-LaFeO into a photocatalytic reactor3The method comprises the following steps of (1) carrying out photocatalytic reaction on a @ MCM-41-1 catalyst, methanol and bisphenol A wastewater, wherein the volume ratio of the methanol to the bisphenol A wastewater is 1:8, and the adding amount of the photocatalyst in each liter of mixture of the methanol and the bisphenol A wastewater is 0.20 g; firstly, dark adsorption reaction is carried out for 30min to achieveAfter the adsorption balance is reached, visible light is provided by a xenon lamp, catalytic reaction is carried out at normal temperature, the supernatant is taken and filtered by a filter membrane of 0.45 mu m at the same interval time period, and the removal rate of bisphenol A is determined to be more than 90 percent and the removal rate of COD in the reaction system is determined to be 90 percent.
Example 2
2.1646g of lanthanum nitrate, 2.02g of ferric nitrate, 0.9g of urea and 2.1028g of MCM-41 are weighed according to the molar ratio of 1:1:3:7 and are added into a three-neck flask to be dissolved in 50mL of distilled water, and the mixture is uniformly stirred to form solution A; according to the proportion of malic acid: 1.3409g of malic acid is added into lanthanum nitrate with the molar ratio of 2:1, 30mL of distilled water is added, and the solution is dissolved and stirred uniformly to form solution B. Slowly adding the solution B into the solution A under stirring, reacting and polymerizing the solution B into sol in a water bath at the temperature of 80 ℃, drying the sol overnight to obtain dry gel, and calcining the dry gel at the temperature of 700 ℃ for 4 hours at the speed of 2 ℃/min to obtain the catalyst N-LaFeO3@MCM-41-2。
Adding N-LaFeO into a photocatalytic reactor3Carrying out photocatalytic reaction on the @ MCM-41-2 catalyst, methanol and benzonitrile wastewater, wherein the volume ratio of the methanol to the benzonitrile wastewater is 1:16, and the adding amount of the photocatalyst in each liter of mixture of the methanol and the benzonitrile wastewater is 0.60 g; firstly carrying out dark adsorption reaction for 30min, providing visible light through a xenon lamp after reaching adsorption balance, carrying out catalytic reaction at normal temperature, taking supernatant fluid and passing through a 0.45 mu m filter membrane, and determining that the removal rate of benzonitrile reaches more than 90% and the removal rate of COD in the reaction system is 92%.
Example 3
2.1646g of lanthanum nitrate, 2.02g of ferric nitrate, 0.6g of urea and 1.502g of MCM-41 are weighed in a three-neck flask according to the molar ratio of 1:1:2:5, and 50mL of distilled water is added to dissolve and stir evenly to form solution A; according to lactic acid: 1.3512g of lactic acid as a complexing agent is added into lanthanum nitrate according to the molar ratio of 3:1, 45mL of distilled water is added, and the solution is dissolved and stirred uniformly to form solution B. Slowly adding the solution B into the solution A under stirring, reacting and polymerizing the solution B into sol in water bath at the temperature of 80 ℃, drying the sol overnight to obtain dry gel, and calcining the dry gel at the temperature of 700 ℃ for 4 hours at the speed of 2 ℃/min to obtain the catalyst N-LaFeO3@MCM-41-3。
Adding N-LaFeO into a photocatalytic reactor3@ MCM-41-3 catalyst, methanol andcarrying out a photocatalytic reaction on the p-methoxybenzonitrile wastewater, wherein the volume ratio of methanol to the p-methoxybenzonitrile wastewater is 1:12, and the adding amount of a photocatalyst in a mixture of each liter of methanol and the p-methoxybenzonitrile wastewater is 0.40 g; firstly carrying out dark adsorption reaction for 30min, providing visible light through a xenon lamp after adsorption equilibrium is achieved, carrying out catalytic reaction, taking supernatant fluid, passing through a 0.45 mu m filter membrane, and determining that the removal rate of p-methoxybenzonitrile reaches more than 90% and the removal rate of COD in a reaction system is 91%.
Example 4
2.1646g of lanthanum nitrate, 2.02g of ferric nitrate, 0.3g of urea and 1.2016g of MCM-41 are weighed according to the molar ratio of 1:1:1:4, are added into a three-neck flask, and are dissolved in 50mL of distilled water and are uniformly stirred to form solution A; according to the aspartic acid: 2.662g of aspartic acid serving as a complexing agent is added into lanthanum nitrate according to the molar ratio of 4:1, 60mL of distilled water is added, and the solution is dissolved and stirred uniformly to form solution B. Slowly adding the solution B into the solution A under stirring, reacting and polymerizing the solution B into sol in water bath at the temperature of 80 ℃, drying the sol overnight to obtain dry gel, and calcining the dry gel at the temperature of 700 ℃ for 4 hours at the speed of 2 ℃/min to obtain the catalyst N-LaFeO3@MCM-41-4。
Adding N-LaFeO into a photocatalytic reactor3The method comprises the following steps of (1) carrying out photocatalytic reaction on a @ MCM-41-4 catalyst, methanol and bisphenol A wastewater, wherein the volume ratio of the methanol to the bisphenol A wastewater is 1:8, and the adding amount of the photocatalyst in each liter of mixture of the methanol and the bisphenol A wastewater is 0.20 g; firstly carrying out dark adsorption reaction for 30min, providing visible light through a xenon lamp after reaching adsorption balance, carrying out catalytic reaction at normal temperature, taking supernatant fluid and passing through a 0.45 mu m filter membrane, and determining that the removal rate of bisphenol A is more than 90% and the removal rate of COD in a reaction system is 91%.
Example 5
2.1646g of lanthanum nitrate, 2.02g of ferric nitrate, 0.6g of urea and 1.502g of MCM-41 are weighed according to the molar ratio of 1:1:2:5, are added into a three-neck flask, and are dissolved in 50mL of distilled water and are uniformly stirred to form solution A; according to the weight ratio of tartaric acid: 1.5009g of tartaric acid as a complexing agent is added into lanthanum nitrate according to the molar ratio of 2:1, 30mL of distilled water is added, and the solution is dissolved and stirred uniformly to form solution B. Slowly adding the solution B into the solution A under stirring,reacting and polymerizing into sol in 80 ℃ water bath, drying overnight to obtain dry gel, calcining at 700 ℃ for 4h at the speed of 2 ℃/min to obtain the catalyst N-LaFeO3@MCM-41-5。
Adding N-LaFeO into a photocatalytic reactor3The method comprises the following steps of (1) carrying out photocatalytic reaction on a @ MCM-41-5 catalyst, methanol and bisphenol A wastewater, wherein the volume ratio of the methanol to the bisphenol A wastewater is 1:8, and the adding amount of the photocatalyst in each liter of mixture of the methanol and the bisphenol A wastewater is 0.20 g; firstly carrying out dark adsorption reaction for 30min, providing visible light through a xenon lamp after reaching adsorption balance, carrying out catalytic reaction at normal temperature, taking supernatant fluid and passing through a 0.45 mu m filter membrane, and determining that the removal rate of bisphenol A is more than 90% and the removal rate of COD in a reaction system is 94%.
Example 6
2.1646g of lanthanum nitrate, 2.02g of ferric nitrate, 0.9g of urea and 1.8024g of MCM-41 are weighed into a three-neck flask according to the molar ratio of 1:1:3:6, 50mL of distilled water is added for dissolving, and then the components are mixed according to the weight ratio of the nitrates: adding 1.8223g of CTAB as a template agent to improve the specific surface area of the catalyst with the molar ratio of CTAB of 1:1, and uniformly stirring to form solution A; according to lactic acid: 1.3512g of lactic acid serving as a complexing agent is added into lanthanum nitrate according to the molar ratio of 3:1, 45mL of distilled water is added, and the solution is dissolved and stirred uniformly to form solution B. Slowly adding the solution B into the solution A under stirring, reacting and polymerizing the solution B into sol in water bath at the temperature of 80 ℃, drying the sol overnight to obtain dry gel, and calcining the dry gel at the temperature of 700 ℃ for 4 hours at the speed of 2 ℃/min to obtain the catalyst N-LaFeO3@MCM-41-6。
Adding N-LaFeO into a photocatalytic reactor3The method comprises the following steps of (1) carrying out a photocatalytic reaction on a @ MCM-41-6 catalyst, oxalic acid and terephthalonitrile wastewater, wherein the volume ratio of the oxalic acid to the terephthalonitrile wastewater is 1:8, and the adding amount of the photocatalyst in each liter of the mixture of the oxalic acid and the terephthalonitrile wastewater is 0.20 g; firstly carrying out dark adsorption reaction for 30min, providing visible light through a xenon lamp after reaching adsorption balance, carrying out catalytic reaction, taking supernatant fluid and passing through a 0.45 mu m filter membrane, and determining that the removal rate of terephthalonitrile reaches more than 90% and the removal rate of COD in a reaction system is 93%.
Comparative example 1
According to the molar ratio2.1646g of lanthanum nitrate, 2.02g of ferric nitrate and 0.9012g of MCM-41 are weighed in a three-neck flask in a ratio of 1:1:3, 50mL of distilled water is added for dissolving, and the mixture is uniformly stirred to form solution A; according to the weight ratio of tartaric acid: 0.7505g of tartaric acid is added into lanthanum nitrate with the molar ratio of 1:1, 15mL of distilled water is added, and the solution is dissolved and stirred uniformly to form solution B. Slowly adding the solution B into the solution A under stirring, reacting and polymerizing the solution B into sol in water bath at the temperature of 80 ℃, drying the sol overnight to obtain dry gel, and calcining the dry gel at the temperature of 700 ℃ for 4 hours at the speed of 2 ℃/min to obtain the catalyst N-LaFeO3@MCM-41-7。
Adding N-LaFeO into a photocatalytic reactor3The method comprises the following steps of (1) carrying out photocatalytic reaction on a @ MCM-41-7 catalyst, methanol and bisphenol A wastewater, wherein the volume ratio of the methanol to the bisphenol A wastewater is 1:8, and the adding amount of the photocatalyst in each liter of mixture of the methanol and the bisphenol A wastewater is 0.20 g; firstly carrying out dark adsorption reaction for 30min, providing visible light through a xenon lamp after reaching adsorption balance, carrying out catalytic reaction at normal temperature, taking supernatant fluid and passing through a 0.45 mu m filter membrane, and determining that the removal rate of bisphenol A does not reach 80% and the removal rate of COD in a reaction system is 70%.
Comparative example 2
2.1646g of lanthanum nitrate, 2.02g of ferric nitrate, 0.3g of urea and 1.5294g of gamma-Al are weighed in a molar ratio of 1:1:1:32O3Adding 50mL of distilled water into a three-neck flask for dissolving, and uniformly stirring to form a solution A; according to the weight ratio of tartaric acid: 0.7505g of tartaric acid is added into lanthanum nitrate with the molar ratio of 1:1, 15mL of distilled water is added, and the solution is dissolved and stirred uniformly to form solution B. Slowly adding the solution B into the solution A under stirring, reacting and polymerizing the solution B into sol in water bath at the temperature of 80 ℃, drying the sol overnight to obtain dry gel, and calcining the dry gel at the temperature of 700 ℃ for 4 hours at the speed of 2 ℃/min to obtain the catalyst N-LaFeO3@γ-Al2O3。
Adding N-LaFeO into a photocatalytic reactor3The method comprises the following steps of (1) carrying out photocatalytic reaction on a @ MCM-41-8 catalyst, methanol and bisphenol A wastewater, wherein the volume ratio of the methanol to the bisphenol A wastewater is 1:8, and the adding amount of the photocatalyst in each liter of mixture of the methanol and the bisphenol A wastewater is 0.20 g; firstly carrying out dark adsorption reaction for 30min, providing visible light through a xenon lamp after reaching adsorption balance, carrying out catalytic reaction at normal temperature at the same interval time period,the supernatant was filtered through a 0.45 μm filter and the removal rate of bisphenol A was determined to be 80% and the removal rate of COD in the reaction system was determined to be 78%.
Comparative example 3
2.1646g of lanthanum nitrate, 2.02g of ferric nitrate, 0.3g of urea and 0.9012g of MCM-41 are weighed according to the molar ratio of 1:1:1:3, are added into a three-neck flask, and are dissolved in 50mL of distilled water and are uniformly stirred to form solution A; according to the citric acid: 0.9607g of citric acid and 15mL of distilled water are added into lanthanum nitrate according to the molar ratio of 1:1, and the solution is dissolved and stirred uniformly to form solution B. Slowly adding the solution B into the solution A under stirring, reacting and polymerizing the solution B into sol in water bath at the temperature of 80 ℃, drying the sol overnight to obtain dry gel, and calcining the dry gel at the temperature of 700 ℃ for 4 hours at the speed of 2 ℃/min to obtain the catalyst N-LaFeO3@MCM-41-9。
Adding N-LaFeO into a photocatalytic reactor3The method comprises the following steps of (1) carrying out photocatalytic reaction on a @ MCM-41-9 catalyst, methanol and bisphenol A wastewater, wherein the volume ratio of the methanol to the bisphenol A wastewater is 1:8, and the adding amount of the photocatalyst in each liter of mixture of the methanol and the bisphenol A wastewater is 0.20 g; carrying out dark adsorption reaction for 30min, providing visible light through a xenon lamp after adsorption equilibrium is reached, carrying out catalytic reaction at normal temperature, measuring bisphenol A after supernatant fluid is taken and filtered by a 0.45 mu m filter membrane at the same interval time period, and the result shows that the removal rate of the bisphenol A only reaches 80 percent and the removal rate of COD in the reaction system is 72 percent.
In the examples 1-6, any one of tartaric acid, malic acid, aspartic acid and lactic acid is used as a complexing agent, urea is used as a mineralizer, MCM-41 is used as a carrier, a nitrogen-doped modified composite catalyst N-LaFeO3@ MCM-41 is successfully prepared by a sol-gel method, a certain amount of hole trapping agent is added under visible light to catalytically degrade any one of organic wastewater of aromatic compounds, namely benzonitrile, p-methoxybenzonitrile, terephthalonitrile and bisphenol A, and the degradation efficiency of the compounds and COD is over 90%.
Comparative example 1 for LaFeO3The @ MCM-41 catalyst is not modified by nitrogen, the effect of the catalyst on degrading aromatic compound wastewater is not ideal, and compared with the nitrogen-modified catalyst, the effect of removing organic matter concentration and COD of wastewater is not ideal.
The support of comparative example 2 was gamma-Al2O3Prepared catalyst N-LaFeO3@γ-Al2O3The efficiency of degrading aromatic compounds is not high because of gamma-Al2O3The specific surface area of (A) is not as large as that of MCM-41, and the contact area during degradation is not sufficient, so that the removal rate is not satisfactory.
Comparative example 3 the reaction time for synthesizing the catalyst by using citric acid as the complexing agent is longer, and the whole experimental period is obviously longer than that of the complexing agent used in the patent. The catalyst obtained by the method has undesirable effect of degrading aromatic compounds, and the concentration and COD removal rate of the wastewater do not reach 90%.

Claims (10)

1. A photocatalyst of nitrogen modified perovskite composite molecular sieve is characterized in that: the photocatalyst is N-LaFeO3@MCM-41。
2. A method for preparing the photocatalyst of the nitrogen-modified perovskite composite molecular sieve as claimed in claim 1, which is characterized by comprising the following steps:
(1) according to the mol ratio of 1:1: 1-3: 3-7, weighing lanthanum nitrate, ferric nitrate, urea and MCM-41, adding water to dissolve, and stirring to form solution A;
(2) dissolving a complexing agent in water, and stirring to form a solution B, wherein the molar ratio of the complexing agent to lanthanum nitrate is 1-4: 1;
(3) and slowly adding the solution B into the solution A to polymerize sol, drying and calcining to obtain the photocatalyst.
3. The method for preparing the photocatalyst of the nitrogen-modified perovskite composite molecular sieve as claimed in claim 2, wherein the method comprises the following steps: in the step (1), a soft template agent is added into the solution A.
4. The method for preparing the photocatalyst of the nitrogen-modified perovskite composite molecular sieve as claimed in claim 2, wherein the method comprises the following steps: in the step (2), the complexing agent is any one of tartaric acid, malic acid, aspartic acid or lactic acid.
5. The application method of the photocatalyst of the nitrogen-modified perovskite composite molecular sieve to degrade aromatic compound organic wastewater, which is characterized by comprising the following steps: adding a photocatalyst, a hole trapping agent and aromatic compound organic wastewater into a photocatalytic reactor to carry out photocatalytic reaction.
6. The application method of the photocatalyst of the nitrogen-modified perovskite composite molecular sieve for degrading the aromatic compound organic wastewater as claimed in claim 5, is characterized in that: the aromatic compound is one of benzonitrile, p-methoxyphenylnitrile, terephthalonitrile or bisphenol A.
7. The application method of the photocatalyst of the nitrogen-modified perovskite composite molecular sieve for degrading the aromatic compound organic wastewater as claimed in claim 5, is characterized in that: the volume ratio of the hole trapping agent to the aromatic compound is 1:8-16, and the adding amount of the photocatalyst in each liter of the mixture of the hole trapping agent and the aromatic compound is 0.2-0.6 g.
8. The application method of the photocatalyst of the nitrogen-modified perovskite composite molecular sieve for degrading the aromatic compound organic wastewater as claimed in claim 5, is characterized in that: dark adsorption is performed prior to the photocatalytic reaction.
9. The application method of the photocatalyst of the nitrogen-modified perovskite composite molecular sieve for degrading the aromatic compound organic wastewater as claimed in claim 5, is characterized in that: the hole trapping agent is one of methanol or ammonium oxalate.
10. The application method of the photocatalyst of the nitrogen-modified perovskite composite molecular sieve for degrading the aromatic compound organic wastewater as claimed in claim 5, is characterized in that: the photocatalytic reaction provides visible light through a xenon lamp.
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