CN112844437A - Preparation method of high-crystalline carbon nitride photo-Fenton catalyst and application of high-crystalline carbon nitride photo-Fenton catalyst in degradation of emerging pollutants - Google Patents
Preparation method of high-crystalline carbon nitride photo-Fenton catalyst and application of high-crystalline carbon nitride photo-Fenton catalyst in degradation of emerging pollutants Download PDFInfo
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- 125000001246 bromo group Chemical group Br* 0.000 description 4
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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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
-
- 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
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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
- C02F2101/38—Organic compounds containing nitrogen
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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
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention belongs to the technical field of treatment of emerging pollutants, and particularly relates to a preparation method of a high-crystalline carbon nitride photo-Fenton catalyst and application thereof in degradation of emerging pollutants, wherein dicyanodiamine is calcined to obtain carbon nitride, then the carbon nitride is mixed with halogen salt, and the mixture is calcined again in an inert gas atmosphere; and finally, preparing the high-crystallization carbon nitride photo-Fenton catalyst after suction filtration, washing and drying. The method has simple synthesis process and good repeatability, can be used for large-scale production, and the prepared carbon nitride photo-Fenton catalyst has obviously improved crystallinity and improved electron transfer rate. Under the condition of existence of a strong oxidant, the catalytic degradation performance of the composite material is greatly enhanced, the composite material has a strong degradation effect on PPCPs, can be applied to degrading emerging pollutants, has a synergistic effect when being applied to treating the wastewater of the emerging pollutants, and can prevent secondary pollution.
Description
Technical Field
The invention belongs to the technical field of emerging pollutant treatment, and particularly relates to a preparation method of a high-crystalline carbon nitride photo-Fenton catalyst and application of the high-crystalline carbon nitride photo-Fenton catalyst in degrading emerging pollutants.
Background
The emerging Pollutants may be chemicals that may affect human health or the ecosystem, but are not currently (or only recently) regulated, such as Pharmaceuticals and Personal Care Products (PPCPs), Persistent Organic Pollutants (POPs), Disinfection By-Products (DBPs), mercury, and the like, and their degradation Products. Among them, the most common PPCPs include human and veterinary drugs such as anti-inflammatory agents, analgesics, antibiotics, beta-blockers, antidepressants, lipid regulators, and disinfectants or fragrances in personal care products. Although the concentration of PPCPs in the environment is generally between ng/L and mug/L, the PPCPs have certain polarity and are difficult to volatilize, and the PPCPs are continuously accumulated in the water environment, so that the physiological activities of algae and aquatic organisms are influenced, and the balance of an ecological system is seriously damaged.
Different scholars have carried out a great deal of research aiming at the PPCPs removal method, mainly comprising biodegradation, physical-chemical method, advanced oxidation and combination technology thereof, and the difference of the removal rate of the PPCPs by the methods is large. Although various methods for processing PPCPs at the present stage in China have certain effects, the methods also have some limitations. The biological treatment method has good degradation effect on partial PPCPs, but is not ideal for removing the PPCPs with poor biodegradability. In the degradation process, the toxicity of some intermediate products is higher than that of the parent products, which poses serious threat to the water environment safety in China. Therefore, it is very important to find a high-efficiency, green and economic degradation technology.
Graphitized carbon nitride, commonly known as g-C3N4The graphene is a polymer layered material, and the structure of the graphene is similar to that of graphene. It has the advantages of high stability, low toxicity, easy preparation, etc. and is excellent photocatalytic material. However, due to g-C3N4Severe recombination probability of photogenerated carriers, limited inversionDue to the defects of active sites and the like, the photocatalytic activity of the photocatalyst is low, and the degradation of PPCPs and other new pollutants in a water body is limited. Therefore, it is necessary to control g-C3N4The catalyst is modified to improve the catalytic performance of the catalyst, so that the catalyst has better application value.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of a high-crystallization carbon nitride photo-Fenton catalyst, the preparation method is simple, the cost and the energy consumption are low, the prepared catalyst has high catalytic degradation efficiency and excellent stability, has a strong degradation effect on PPCPs, and can be applied to degrading new pollutants.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a preparation method of a high-crystallization carbon nitride photo-Fenton catalyst, which comprises the following steps:
s1, calcining dicyanodiamine at high temperature to obtain carbon nitride;
s2, mixing carbon nitride with halogen salt, grinding, and heating and calcining in an inert gas atmosphere to obtain a yellow-green solid;
and S3, adding water into the yellow-green solid, heating and stirring, and then carrying out suction filtration, washing and drying to obtain the high-crystalline carbon nitride photo-Fenton catalyst.
According to the invention, the carbon nitride is modified by calcining the carbon nitride and the halogen salt, so that the carbon nitride photo-Fenton catalyst with obviously improved crystallinity is prepared, the preparation cost is low, the preparation process is simple, the requirement on preparation conditions is low, the catalyst can be repeatedly used for many times, and a complex regeneration process is not needed. Meanwhile, the method can also improve the electron transfer rate of the carbon nitride material, reduce the electron hole recombination rate and improve the catalytic performance, when the method is applied to treating wastewater containing PPCPs, the wastewater can efficiently degrade the PPCPs in the water due to the photo-Fenton reaction, on one hand, the reaction conditions are mild, and persulfate can be activated to generate active substances such as hydroxyl radicals, sulfate radicals, superoxide radicals and the like; on the other hand, has synergistic effect and can continuously generate substances (H) with strong oxidizing property+、O2 -、SO4 -And OH) to efficiently remove antibiotic substances in water and mineralize the antibiotic substances into H2O and CO2And the like, so as to prevent secondary pollution; in addition, the carbon nitride photo-Fenton catalyst is used for carrying out the photo-Fenton reaction of wastewater, so that the problems that the pH value of a reaction system is too strict by the traditional Fenton oxidation method, the treated water has colors, a large amount of sludge is generated and the like can be solved.
Preferably, the calcining temperature in step S2 is 350-600 ℃, the time is 3-5 h, and the temperature rise rate is 4-5 ℃ per min. Further, the temperature of the calcination is 350 ℃, 450 ℃, 500 ℃, 550 ℃ or 600 ℃. Specifically, the temperature of the calcination is 550 ℃ or 600 ℃.
Preferably, the halogen salt in step S2 is a mixture of a plurality of halogen salts. Further, the halogen salt in step S2 is a mixture of two halogen salts of the same halogen. Further, in step S2, the mass ratio of the two halogen salts is 1: 1-1.6: 1. Specifically, the mass ratio of the two halogen salts in step S2 is 1.0: 1. 1.2: 1. 1.4: 1. 1.6: 1.
specifically, the halogen salt mixture is lithium chloride, a potassium chloride mixture or a potassium bromide and lithium bromide mixture. More specifically, the mass ratio of lithium chloride to potassium chloride or potassium bromide to lithium bromide is 1.0: 1. 1.2: 1. 1.4: 1. 1.6: 1.
preferably, the calcining temperature in step S1 is 450-550 ℃, the time is 2-4 h, and the temperature rise rate is 2-4 ℃ per min. Further, the calcination temperature in step S1 is 550 ℃, the time is 3h, and the temperature rise rate is 3 ℃/min.
Preferably, the inert gas of step S2 includes, but is not limited to, nitrogen.
Preferably, in the step S3, the heating and stirring are performed at 80-90 ℃ for not less than 0.5 h. Further, the heating and stirring are carried out at 85 ℃ for 0.5 h.
Preferably, the washing in step S3 is washing with water and ethanol several times.
The invention also provides the high-crystalline carbon nitride photo-Fenton catalyst prepared by the preparation method.
The invention also provides application of the high-crystalline carbon nitride photo-Fenton catalyst in degrading emerging pollutants.
The invention also provides application of the high-crystalline carbon nitride photo-Fenton catalyst in treatment of wastewater containing emerging pollutants.
Preferably, the emerging contaminants are PPCPs. Further, the PPCPs include, but are not limited to, Naproxen (NPX), Indomethacin (IDM), Carbamazepine (CBZ), Triclosan (TCS), Sulfamethoxazole (SMZ), Enrofloxacin (ENR), and Diclofenac (DCF) or diclofenac sodium.
The invention also provides a treatment method of wastewater containing PPCPs, which comprises the following steps:
s1, adding the high-crystalline carbon nitride photo-Fenton catalyst into wastewater containing PPCPs pollutants, and stirring in the absence of light to achieve adsorption-desorption balance;
and S2, adding persulfate, then turning on a light source and continuously stirring to enable the wastewater containing the PPCPs to generate a photo-Fenton reaction.
Preferably, the amount of the highly crystalline carbon nitride photo-Fenton catalyst to be added is (0.1 to 0.9) g/L. Further, the amount of the highly crystalline carbon nitride photo-fenton catalyst to be charged was 0.5 g/L.
Preferably, the addition amount of the persulfate is (0.2-2) mmol/L. Further, the persulfate includes, but is not limited to, potassium persulfate.
Preferably, the concentration of the PPCPs in the wastewater is not more than 40 mg/L.
Preferably, the stirring time in the step S1 is 0.5-1 h.
Preferably, the time of the photo-fenton reaction in step S2 is 0.5 to 2 hours. Further, the time of the photo-fenton reaction was 1 hour.
Preferably, the light source used in the photo-fenton reaction in step S2 is a 500W xenon lamp, and a 420nm filter is used to filter out the uv light.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a preparation method of a high-crystallization carbon nitride photo-Fenton catalyst, which comprises the steps of firstly calcining dicyanodiamine to obtain carbon nitride, then mixing the carbon nitride with halogen salt, and calcining again in an inert gas atmosphere; and finally, preparing the high-crystallization carbon nitride photo-Fenton catalyst after suction filtration, washing and drying. The method has simple synthesis process and good repeatability, can be used for large-scale production, and the prepared carbon nitride photo-Fenton catalyst has obviously improved crystallinity and improved electron transfer rate. Under the condition of existence of a strong oxidant, the catalytic degradation performance of the catalyst is greatly enhanced, the catalyst has a strong degradation effect on PPCPs, and the catalyst can be applied to degrading new pollutants. The composite material has a synergistic effect when being applied to treating emerging pollutant wastewater, can continuously generate strong oxidizing substances under visible light to efficiently remove emerging pollutants in water, mineralizes the emerging pollutants into harmless micromolecular substances, and prevents secondary pollution.
Drawings
FIG. 1 is a TEM test result chart (A is CCN-550; B is carbon nitride BCN);
FIG. 2 shows the photo-Fenton degradation efficiency of CCN-T on diclofenac sodium;
FIG. 3 shows the efficiency of CCN-550 in degrading different PPCPs contaminants;
FIG. 4 shows the degradation efficiency of CCN-550 on diclofenac under different concentrations of potassium persulfate.
Detailed Description
The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The experimental procedures in the following examples were carried out by conventional methods unless otherwise specified, and the test materials used in the following examples were commercially available by conventional methods unless otherwise specified.
Example 1 highly crystalline carbon nitride photo-fenton catalyst prepared from different calcination temperatures
The preparation method comprises the following steps:
(1) weighing 4g of dicyanodiamine, placing the dicyanodiamine in an alumina crucible, transferring the alumina crucible to a muffle furnace, heating to 550 ℃ at a heating rate of 3 ℃/min, calcining, and keeping the temperature for 3 hours to obtain light yellow solid BCN (BCN is carbon nitride which is not calcined by molten salt);
(2) mixing 0.4g of BCN, 2.2g of potassium chloride and 1.8g of lithium chloride, fully grinding the obtained solid mixture (7000 meshes), transferring the solid mixture to a tubular furnace, heating to 350-600 ℃ at a heating rate of 4.5 ℃/min in a nitrogen atmosphere, calcining, and keeping for 4 hours to obtain a yellow-green solid.
(3) Adding 500mL of ultrapure water into the calcined yellow-green solid, and heating and stirring at 85 ℃ for 0.5 h; and then carrying out suction filtration, washing the obtained product for 3 times by using ultrapure water after the suction filtration, then washing the obtained product for 2 times by using absolute ethyl alcohol, drying the obtained product for 24 hours in an oven at 50 ℃, and grinding and sieving the obtained product (7000 meshes) after the obtained product is cooled to room temperature to obtain the CCN-T photo-Fenton catalyst (powder). Wherein T is the corresponding calcining temperature in the step (2), and T is 350, 450, 500, 550 and 600.
The CCN-550 photo-fenton catalyst prepared above was subjected to Transmission Electron Microscopy (TEM) test, and the test results are shown in fig. 1. As can be seen from FIG. 1, CCN-550 is more crystalline and has a distinct lattice structure (compare to carbon nitride BCN).
In addition, the TEM test results of CCN-350, CCN-450, CCN-500, and CCN-600 are similar to that of CCN-550.
Example 2 preparation of highly crystalline carbon nitride photo-Fenton catalyst from Bromide salt
The preparation method comprises the following steps:
(1) weighing 4g of dicyanodiamine, placing the dicyanodiamine in an alumina crucible, transferring the alumina crucible to a muffle furnace, raising the temperature to 550 ℃ at a heating rate of 3 ℃/min, calcining, and keeping the temperature for 3 hours to obtain light yellow solid BCN;
(2) mixing 0.4g of BCN, 2.2g of potassium bromide and 1.8g of lithium bromide, fully grinding the obtained solid mixture (7000 meshes), transferring the solid mixture to a tubular furnace, raising the temperature to 550 ℃ at the heating rate of 4.5 ℃/min under the nitrogen atmosphere, calcining, and keeping for 4 hours to obtain a yellow-green solid;
(3) adding 500mL of ultrapure water into the calcined yellow-green solid, and heating and stirring at 85 ℃ for 0.5 h; and then carrying out suction filtration, washing the obtained product for 3 times by using ultrapure water after the suction filtration, then washing the obtained product for 2 times by using absolute ethyl alcohol, drying the obtained product for 24 hours in a drying oven at 50 ℃, and grinding and sieving the obtained product (7000 meshes) after the obtained product is cooled to room temperature to obtain the CCN-Br photo-Fenton catalyst (powder).
The TEM test results of CCN-Br were similar to that of CCN-550.
Example 3 high crystalline carbon nitride photo-Fenton catalysts prepared from different halide salt ratios
The preparation method comprises the following steps:
(1) weighing 4g of dicyanodiamine, placing the dicyanodiamine in an alumina crucible, transferring the alumina crucible to a muffle furnace, raising the temperature to 550 ℃ at a heating rate of 3 ℃/min, calcining, and keeping the temperature for 3 hours to obtain light yellow solid BCN;
(2) adding 0.4g of BCN into a certain proportion of mixed chlorine salt (potassium chloride and lithium chloride in a mass ratio of 1: 1-1.6: 1), fully grinding the obtained solid mixture (7000 meshes), transferring the solid mixture into a tubular furnace, heating to 550 ℃ at a heating rate of 4.5 ℃/min in the nitrogen atmosphere, calcining, and keeping for 4 hours to obtain a yellow-green solid;
(3) adding 500mL of ultrapure water into the calcined yellow-green solid, and heating and stirring at 85 ℃ for 0.5 h; and then carrying out suction filtration, washing the obtained product for 3 times by using ultrapure water after the suction filtration, then washing the obtained product for 2 times by using absolute ethyl alcohol, drying the obtained product for 24 hours in a drying oven at 50 ℃, and grinding and sieving the obtained product (7000 meshes) after the obtained product is cooled to room temperature to obtain the CCN-R photo-Fenton catalyst (powder). R is the mass ratio of potassium chloride to lithium chloride, and R is 1.0: 1,1.2: 1,1.4: 1,1.6: 1.
the TEM test results of CCN-R are similar to that of CCN-550.
Experimental example 1 application of high-crystalline carbon nitride photo-Fenton catalyst in diclofenac sodium wastewater treatment
(1) 25mg of the BCN, CCN-T, CCN-Br and CCN-R catalysts prepared in examples 1-3 were weighed into a quartz photolysis tube, 50mL of a diclofenac sodium solution with a concentration of 20mg/L was added, and the solution was placed in a photochemical reaction chamber (Zhongzhijin source, model: CEL-LB 70-3).
(2) After adsorbing for 30min, 1mmol/L potassium persulfate was added, a 500W xenon lamp (using a 420nm filter to filter out the UV portion) was turned on and the photo-Fenton reaction was carried out with continuous stirring for 1 h. The concentration C of diclofenac sodium remaining in the solution was determined using liquid chromatography. According to the formula N ═ C0-C)/C0X 100%, and calculating the removal rate N of diclofenac sodium, wherein C0Is the initial concentration of diclofenac sodium. Finally obtaining the removal rate of the diclofenac sodium by the photo-Fenton catalyst.
As shown in Table 1, compared with catalysts calcined by bromine salt and chlorine salt, the material calcined by mixed chlorine salt has better catalytic performance; compared with a catalyst calcined under the condition of different proportions of potassium chloride and lithium chloride, the material calcined under the condition that the mass ratio of the potassium chloride to the lithium chloride is 1.2:1 has better catalytic performance.
The effect of CCN-T in application example 1 on diclofenac sodium removal is shown in Table 1 and FIG. 2. For materials calcined at different temperatures, the degradation effect is CCN-550 > CCN-600 > CCN-500 > CCN-450 > CCN-350, which may be related to the crystallinity of the material.
TABLE 1 photo-Fenton degradation rate of CCN-T on diclofenac sodium
| Catalyst and process for preparing same | Removal Rate (%) |
| BCN | 19.02 |
| CCN-350 | 25.28 |
| CCN-450 | 26.53 |
| CCN-500 | 46.26 |
| CCN-550 | 98.54 |
| CCN-600 | 80.94 |
| CCN-Br | 56.67 |
| CCN-1.0：1 | 63.54 |
| CCN-1.2：1 | 98.54 |
| CCN-1.4：1 | 67.21 |
| CCN-1.6：1 | 50.93 |
Experimental example 2 application of high-crystalline carbon nitride photo-Fenton catalyst in PPCPs wastewater treatment
(1) 25mg of the CCN-550 catalyst prepared in example 1 was weighed into a quartz photolysis tube, 50mL of a 20mg/L Naproxen (NPX) solution, an Indomethacin (IDM) solution, a Carbamazepine (CBZ) solution, a Triclosan (TCS) solution, a Sulfamethoxazole (SMZ) solution, an Enrofloxacin (ENR) solution and a Diclofenac (DCF) solution were added, and the mixture was placed in a photochemical reaction chamber.
(2) After adsorbing for 30min, 1mmol/L potassium persulfate was added, a 500W xenon lamp (using a 420nm filter to filter out the UV portion) was turned on and the photo-Fenton reaction was carried out with continuous stirring for 1 h. Determination of solutions using liquid chromatographyC concentration of remaining contaminants. According to the formula N ═ C0-C)/C0X 100%, and calculating the removal rate N of the contaminants, wherein C0Is the initial concentration of the contaminant. Finally obtaining the degradation efficiency of CCN-550 on different PPCPs pollutants.
Table 2 and fig. 3 show the photo-fenton degradation effect of CCN-550 in application example 1 on different PPCPs contaminants. As can be seen from Table 2 and FIG. 3, CCN-550 has strong degradation effect on different PPCPs pollutants.
TABLE 2 CCN-550 degradation efficiency for different PPCPs contaminants
Experimental example 3 treatment effect of highly crystalline carbon nitride photo-Fenton catalyst on diclofenac wastewater under the condition of different concentrations of potassium persulfate
(1) 25mg of the CCN-550 catalyst prepared in example 1 was weighed into a quartz photolysis tube, 50mL of a diclofenac sodium solution with a concentration of 20mg/L was added, and the mixture was placed in a photochemical reaction chamber.
(2) After adsorbing for 30min, adding 0.2-2 mmol/L potassium persulfate, starting a 500W xenon lamp (filtering out ultraviolet part by using a 420nm filter) and continuously stirring for carrying out the photo-Fenton reaction for 1 h. The concentration C of diclofenac sodium remaining in the solution was determined using liquid chromatography. According to the formula N ═ C0-C)/C0X 100%, and calculating the removal rate N of diclofenac sodium, wherein C0Is the initial concentration of diclofenac sodium. Finally obtaining the removal rate of the diclofenac sodium of the photo-Fenton catalyst under the condition of different addition amounts of potassium persulfate.
As can be seen from Table 3 and FIG. 4, when the concentration of potassium persulfate is 0.2 mM-1.0 mM, the efficiency of degrading diclofenac by CCN-550 increases with the increase of the concentration of potassium persulfate; when the concentration of the potassium persulfate is more than 1.0mM, the degradation efficiency of the diclofenac by the CCN-550 is not obviously improved. Therefore, 1.0mM was the optimum concentration for potassium persulfate.
TABLE 3 degradation efficiency of diclofenac by CCN-550 under different concentrations of potassium persulfate
| Concentration of potassium persulfate | Removal Rate (%) |
| 0.2mM | 90.94 |
| 0.5mM | 94.33 |
| 1.0mM | 98.47 |
| 1.5mM | 99.62 |
| 2.0mM | 99.79 |
The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (10)
1. A preparation method of a high-crystallization carbon nitride photo-Fenton catalyst is characterized by comprising the following steps:
s1, calcining dicyanodiamine at high temperature to obtain carbon nitride;
s2, mixing carbon nitride with halogen salt, grinding, and heating and calcining in an inert gas atmosphere to obtain a yellow-green solid;
and S3, adding water into the yellow-green solid, heating and stirring, and then carrying out suction filtration, washing and drying to obtain the high-crystalline carbon nitride photo-Fenton catalyst.
2. The method for preparing a highly crystalline carbon nitride photo-fenton catalyst according to claim 1, wherein the calcination temperature in step S2 is (350-600) c, the calcination time is (3-5) h, and the temperature rise rate is (4-5) c/min.
3. The method of claim 1, wherein the halogen salt in step S2 is a mixture of a plurality of halogen salts.
4. The method of claim 3, wherein the halogen salt in step S2 is a mixture of two halogen salts with halogen.
5. The method for preparing a highly crystalline carbon nitride photo-fenton catalyst according to claim 4, wherein the mass ratio of the two halogen salts is 1: 1-1.6: 1.
6. The highly crystalline carbon nitride photo-Fenton catalyst prepared by the preparation method according to any one of claims 1 to 5.
7. Use of the highly crystalline carbon nitride photo-fenton catalyst of claim 6 for the degradation of emerging contaminants.
8. A method for treating wastewater containing PPCPs is characterized by comprising the following steps:
s1, adding the high-crystalline carbon nitride photo-Fenton catalyst in the claim 7 into wastewater containing PPCPs pollutants, and stirring the wastewater under the condition of no light to reach the adsorption-desorption balance;
and S2, adding persulfate, then turning on a light source and continuously stirring to enable the PPCPs wastewater to have a photo-Fenton reaction.
9. The method for treating wastewater containing PPCPs according to claim 8, wherein the amount of the highly crystalline carbon nitride photo-Fenton catalyst added is (0.1-0.9) g/L.
10. The method for treating wastewater containing PPCPs according to claim 8, wherein the persulfate is added in an amount of (0.2-2) mmol/L.
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