CN110721722A - CuS/In2S3@C3N4Visible light response photocatalyst and preparation method thereof - Google Patents
CuS/In2S3@C3N4Visible light response photocatalyst and preparation method thereof Download PDFInfo
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 230000004298 light response Effects 0.000 title claims abstract description 14
- 229910000000 metal hydroxide Inorganic materials 0.000 claims abstract description 30
- 150000004692 metal hydroxides Chemical class 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 239000000243 solution Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000008367 deionised water Substances 0.000 claims abstract description 25
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 25
- 239000011259 mixed solution Substances 0.000 claims abstract description 19
- 239000002244 precipitate Substances 0.000 claims abstract description 16
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004202 carbamide Substances 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000012266 salt solution Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 11
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 claims abstract description 10
- PSCMQHVBLHHWTO-UHFFFAOYSA-K indium(iii) chloride Chemical compound Cl[In](Cl)Cl PSCMQHVBLHHWTO-UHFFFAOYSA-K 0.000 claims abstract description 10
- YUKQRDCYNOVPGJ-UHFFFAOYSA-N thioacetamide Chemical compound CC(N)=S YUKQRDCYNOVPGJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- DLFVBJFMPXGRIB-UHFFFAOYSA-N thioacetamide Natural products CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 238000010992 reflux Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000000227 grinding Methods 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 14
- 239000010949 copper Substances 0.000 claims description 12
- 239000007795 chemical reaction product Substances 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- -1 polytetrafluoroethylene Polymers 0.000 abstract description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract description 6
- 239000000843 powder Substances 0.000 description 12
- 230000001699 photocatalysis Effects 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007146 photocatalysis Methods 0.000 description 3
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 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 2
- 229940012189 methyl orange Drugs 0.000 description 2
- 238000013032 photocatalytic reaction Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Classifications
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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
-
- 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
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/04—Sulfides
-
- B01J35/39—
-
- 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
-
- 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
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- 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 relates to a photocatalyst, in particular to a photocatalyst C3N4 as visible light photocatalyst and its preparation process. Visible light response photocatalyst CuS/In2S3@C3N4The preparation method comprises the following steps: adding a urea solution into a mixed solution of copper nitrate and indium chloride, mixing and stirring to obtain a salt solution, sequentially adding an alkali solution to precipitate, adjusting the pH to 5.8-6.3, heating to 95-100 ℃, performing reflux reaction for 7-9 hours to obtain a precipitate, and drying to obtain a metal hydroxide; adding metal hydroxide and thioacetamide into deionized water, mixing, and adding polytetrafluoroethylene at 70-90 DEG CHeating and reacting for 11-13 hours to obtain CuS/In2S3@C3N4. The photocatalyst obtained by the invention has visible light response capability, can effectively utilize the response capability of visible light in sunlight, improves the utilization rate of the sunlight and improves the reaction efficiency.
Description
Technical Field
The invention relates to a photocatalyst, in particular to a photocatalyst C3N4 as visible light photocatalyst and its preparation process.
Background
Solar energy is a clean energy source, and a photocatalysis technology is an excellent means for utilizing the solar energy. The research directions of photocatalysis mainly include photocatalytic degradation of pollutants, photocatalytic decomposition of water to produce hydrogen, photocatalytic organic synthesis reaction, photocatalytic carbon dioxide conversion and the like, wherein the photocatalyst is the core of different photocatalytic reactions, and the excellent photocatalyst can accelerate the chemical reaction rate and improve the chemical reaction selectivity. TiO 22Is the first photocatalyst discovered, and intensive research has been conducted, but TiO2TiO can only absorb and utilize ultraviolet rays in sunlight and cannot utilize visible light with a large proportion, so that TiO can only absorb and utilize ultraviolet rays in sunlight2The efficiency of the photocatalyst cannot be significantly improved.
g-C3N4The composite visible-light-induced photocatalyst is a visible-light-responsive photocatalyst and has a photocatalytic capacity, and a CdS/g-C3N4 composite visible-light-induced photocatalyst is disclosed in a Chinese patent with the patent publication number of CN103191766A, but the composite visible-light-induced photocatalyst has poor stability and low photoresponsive capacity for visible light. The CdS has high toxicity and causes secondary environmental pollution.
Disclosure of Invention
Technical problem to be solved
In order to solve the above problems of the prior art, the present invention provides a CuS/In for improving the utilization rate and reaction efficiency of visible light catalyst sunlight2S3@C3N4A visible light response photocatalyst and a preparation method thereof.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a visible light response photocatalyst which is CuS/In2S3@C3N4。
In the above scheme, the visible light responds to the lightCatalyst CuS/In2S3@C3N4The preparation method comprises the following steps:
s1 Metal hydroxide preparation
Adding a urea solution into a mixed solution of copper nitrate and indium chloride, mixing and stirring to obtain a salt solution, sequentially adding an alkali solution to precipitate, adjusting the pH to 5.8-6.3, heating to 95-100 ℃, performing reflux reaction for 7-9 hours to obtain a precipitate, and drying to obtain a metal hydroxide;
s2, adding the metal hydroxide and the thioacetyl into deionized water, mixing the mixture with polytetrafluoroethylene, heating and reacting at 70-90 ℃ for 11-13 hours to obtain CuS/In2S3@C3N4。
Further, In step S1, the concentrations of Cu and In the mixed solution are 0.008 to 0.013mol/ml and 0.015 to 0.025mol/ml, respectively. Further, in step S1, the concentration of the urea solution is 3.5-4.5 g/100ml, and the urea solution and the mixed solution are mixed according to the volume ratio of 1: 0.5-1.
Further, in step S1, the alkali solution is a sodium hydroxide solution with a concentration of 1-3 g/100 ml.
Further, in step S1, the obtained precipitate is sequentially subjected to centrifugal separation, deionized water washing, drying at 50-65 ℃ for 9-11 h, and grinding to obtain the metal hydroxide.
Further, in step S2, the metal hydroxide and thioacetamide are mixed according to the mass ratio of Cu to S substance of 1: 3-5, and dissolved in deionized water with the same volume portion as the mixed solution in step S1.
Further, In step S2, the reaction product obtained after the heating reaction is centrifuged at 1000rpm for 25-35 min, washed with deionized water and absolute ethyl alcohol, dried at 55-65 ℃ for 11-13 h, calcined at 500-600 ℃ for 3-6 h, naturally cooled to room temperature, and ground to obtain CuS/In2S3@C3N4。
(III) advantageous effects
The invention has the beneficial effects that:
1. the photocatalyst obtained by the invention has visible light response capability, can effectively utilize the response capability of visible light in sunlight, improves the utilization rate of the sunlight and improves the reaction efficiency.
2. The catalyst of the invention greatly reduces the toxicity of the CdS, the photoproduction charge of the CdS is easy to be compounded In vivo, and the CuS/In catalyst of the invention2S3A heterojunction structure is formed, photo-generated charges are more easily separated and are not easily compounded due to different energy levels, and the effect of the catalyst is improved.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention by way of specific embodiments thereof.
A visible light response photocatalyst which is CuS/In2S3@C3N4。
The visible light response photocatalyst CuS/In the scheme2S3@C3N4The preparation method comprises the following steps:
s1 Metal hydroxide preparation
Adding a urea solution into a mixed solution of copper nitrate and indium chloride, mixing and stirring to obtain a salt solution, sequentially adding an alkali solution to precipitate, adjusting the pH to 5.8-6.3, heating to 95-100 ℃, performing reflux reaction for 7-9 hours to obtain a precipitate, and drying to obtain a metal hydroxide;
s2, adding the metal hydroxide and the thioacetyl into deionized water, mixing the mixture with polytetrafluoroethylene, heating and reacting at 70-90 ℃ for 11-13 hours to obtain CuS/In2S3@C3N4。
Further, In step S1, the concentrations of Cu and In the mixed solution are 0.008 to 0.013mol/ml and 0.015 to 0.025mol/ml, respectively.
Further, in step S1, the concentration of the urea solution is 3.5-4.5 g/100ml, and the urea solution and the mixed solution are mixed according to the volume ratio of 1: 0.5-1.
Further, in step S1, the alkali solution is a sodium hydroxide solution with a concentration of 1-3 g/100 ml.
Further, in step S1, the obtained precipitate is sequentially subjected to centrifugal separation, deionized water washing, drying at 50-65 ℃ for 9-11 h, and grinding to obtain metal hydroxide;
further, in step S2, the metal hydroxide and thioacetamide are mixed according to the mass ratio of Cu to S substance of 1: 3-5, and dissolved in deionized water with the same volume portion as the mixed solution in step S1.
Further, In step S2, centrifuging the reaction product obtained after the heating reaction at 1000rpm for 25-35 min, washing the reaction product with deionized water for 3 times, then washing the reaction product with absolute ethyl alcohol for three times, drying the reaction product at 55-65 ℃ for 11-13 hours, then roasting the reaction product at 500-600 ℃ for 3-6 hours, naturally cooling the roasting product to room temperature, and grinding the roasting product to obtain the CuS/In2S3@C3N4。
Example 1
Visible light response photocatalyst CuS/In2S3@C3N4The preparation method comprises the following steps:
s1 Metal hydroxide preparation
S11, dissolving copper nitrate and indium chloride In 100ml of deionized water according to the Cu to In mass ratio of 1:2 to obtain mixed solution with the concentrations of the copper nitrate and the indium chloride being 0.01mol/ml and 0.02mol/ml respectively; pouring the obtained mixed solution into a three-neck flask, adding 100ml of urea solution with the concentration of 4g/100ml, and magnetically stirring to uniformly mix the urea solution and the urea solution to obtain a salt solution;
s12, adding 100ml of sodium hydroxide with the concentration of 2g/100ml into the obtained salt solution to dissolve out a precipitate, adjusting the pH to 6 by using 0.1mol/L hydrochloric acid, carrying out reflux reaction at 100 ℃ for 8 hours, taking out the precipitate after the reaction is finished, carrying out centrifugal separation, washing 3 times by using deionized water, drying at 60 ℃ for 10 hours, and grinding to obtain metal hydroxide;
s2 adding the metal hydroxide and thioacetamide into 100ml deionized water according to the mass ratio of Cu in the metal hydroxide to S substance in the thioacetamide of 1:4, mixing, transferring into a polytetrafluoroethylene lining belonging to a reaction kettle, putting into a stainless steel reaction kettle, heating and reacting at 80 ℃ for 12 hours. After the reaction is finished, centrifuging at 1000rpm for 30min, washing for 3 times by using deionized water, then washing for three times by using absolute ethyl alcohol, drying for 12 hours at 60 ℃, and grinding to obtain solid powder; roasting the obtained solid powder for 4 hours at 550 ℃, naturally cooling to room temperature, and grinding to obtain CuS/In2S3@C3N4。
Example 2
Visible light response photocatalyst CuS/In2S3@C3N4The preparation method comprises the following steps:
s1 Metal hydroxide preparation
S11, dissolving copper nitrate and indium chloride In deionized water according to the mass ratio of Cu to In of 1:1.5 to obtain mixed solution with the concentrations of the copper nitrate and the indium chloride being 0.008mol/ml and 0.012mol/ml respectively; pouring the obtained mixed solution into a three-neck flask, adding 3.5g/100ml urea solution according to the volume ratio of 1: 0.5, and magnetically stirring to uniformly mix the solution to obtain a salt solution;
s12, adding the obtained salt solution into sodium hydroxide with the volume 0.5 times that of the salt solution and the concentration of 1g/100ml to dissolve out precipitate, adjusting the pH to 5.8 by using 0.1mol/L hydrochloric acid, carrying out reflux reaction at 95 ℃ for 7 hours, taking out the precipitate after the reaction is finished, carrying out centrifugal separation, washing with deionized water for 3 times, drying at 50 ℃ for 9 hours, and grinding to obtain metal hydroxide;
s2 adding the metal hydroxide and thioacetamide into 100ml of deionized water according to the mass ratio of Cu in the metal hydroxide to S substances in the thioacetamide of 1:3, mixing, transferring into a polytetrafluoroethylene lining belonging to a reaction kettle, putting into a stainless steel reaction kettle, and heating and reacting for 11-13 hours at 70 ℃. After the reaction is finished, centrifuging at 1000rpm for 25min, washing for 3 times by using deionized water, then washing for three times by using absolute ethyl alcohol, drying for 11 hours at 55 ℃, and grinding to obtain solid powder; roasting the obtained solid powder at 500 ℃ for 3 hours, naturally cooling to room temperature, and grinding to obtain CuS/In2S3@C3N4。
Example 3
Visible light response photocatalyst CuS/In2S3@C3N4The preparation method comprises the following steps:
s1 Metal hydroxide preparation
S11, dissolving copper nitrate and indium chloride In deionized water according to the mass ratio of Cu to In of 1:2.5 to obtain copper nitrate and indium chloride with the concentrations of 0.008mol/ml and 0.02mol/ml respectively; pouring the obtained mixed solution into a three-neck flask, adding a urea solution with the concentration of 4.5g/100ml according to the volume ratio of 1:1, and magnetically stirring to uniformly mix the mixed solution to obtain a salt solution;
s12, adding the obtained salt solution into sodium hydroxide with the concentration of 3g/100ml and the volume of 2 times of that of the salt solution to dissolve out precipitates, adjusting the pH value to 6.3 by using 0.1mol/L hydrochloric acid, carrying out reflux reaction at 100 ℃ for 9 hours, taking out the precipitates after the reaction is finished, carrying out centrifugal separation, washing the precipitates for 3 times by using deionized water, drying the precipitates for 11 hours at 65 ℃, and grinding the precipitates to obtain metal hydroxide;
s2 adding the metal hydroxide and thioacetamide into 100ml deionized water according to the mass ratio of Cu in the metal hydroxide to S substance in the thioacetamide of 1:5, mixing, transferring into a polytetrafluoroethylene lining belonging to a reaction kettle, putting into a stainless steel reaction kettle, and heating and reacting for 13 hours at 90 ℃. After the reaction is finished, centrifuging at 1000rpm for 35min, washing for 3 times by using deionized water, then washing for three times by using absolute ethyl alcohol, drying for 13 hours at 65 ℃, and grinding to obtain solid powder; roasting the obtained solid powder at 600 ℃ for 6 hours, naturally cooling to room temperature, and grinding to obtain CuS/In2S3@C3N4。
The embodiments 1 to 3 of the invention can be effectively applied to photocatalytic degradation of organic pollutants, such as methyl orange containing nitrogen-nitrogen double bonds.
Example 4
In is mixed with2S3@C3N4And CuS/In obtained In step S22S3@C3N4The powder and the CuS powder respectively take the same molar number to be used for photocatalytic degradation of methyl orange containing nitrogen-nitrogen double bonds through visible light photocatalytic reaction under the same condition, and the powder and the CuS powder can be obtained through calculation within the same time period: CuS/In2S3@C3N4Degradation ofThe efficiency reaches 90 percent, while the degradation efficiency of the metal hydroxide solid powder is 70 percent, and the degradation efficiency of the CuS powder is 55 percent, thereby obtaining the product of CuS/In2S3@C3N4In the structure of2S3@C3N4Can improve the visible light photocatalysis efficiency of CuS, and CuS can also improve In2S3@C3N4So that CuS/In2S3@C3N4The photocatalyst has stronger degradation effect when being used as a visible light response photocatalyst.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A visible light response photocatalyst is characterized In that the photocatalyst is CuS/In2S3@C3N4。
2. The visible-light-responsive photocatalyst CuS/In of claim 12S3@C3N4The preparation method is characterized by comprising the following steps:
s1 Metal hydroxide preparation
Adding a urea solution into a mixed solution of copper nitrate and indium chloride, mixing and stirring to obtain a salt solution, sequentially adding an alkali solution to precipitate, adjusting the pH to 5.8-6.3, heating to 95-100 ℃, performing reflux reaction for 7-9 hours to obtain a precipitate, and drying to obtain a metal hydroxide;
s2, adding metal hydroxide and thioacetyl into deionized water, mixing, heating at 70-90 ℃ for reaction for 11-13 hours to obtain CuS/In2S3@C3N4。
3. The method of claim 1Visible light response photocatalyst CuS/In2S3@C3N4The preparation method is characterized by comprising the following steps: in the step S1, the concentrations of Cu and In the mixed solution are 0.008-0.013 mol/ml and 0.015-0.025 mol/ml respectively.
4. The visible-light-responsive photocatalyst CuS/In of claim 12S3@C3N4The preparation method is characterized by comprising the following steps: in the step S1, the concentration of the urea solution is 3.5-4.5 g/100ml, and the urea solution and the mixed solution are mixed according to the volume ratio of 1: 0.5-1.
5. The visible-light-responsive photocatalyst CuS/In of claim 12S3@C3N4The preparation method is characterized by comprising the following steps: in step S1, the alkali solution is a sodium hydroxide solution with a concentration of 1-3 g/100 ml.
6. The visible-light-responsive photocatalyst CuS/In of claim 12S3@C3N4The preparation method is characterized by comprising the following steps: and in the step S1, the obtained precipitate is sequentially subjected to centrifugal separation, deionized water washing, drying at 50-65 ℃ for 9-11 h, and grinding to obtain the metal hydroxide.
7. The visible-light-responsive photocatalyst CuS/In of claim 12S3@C3N4The preparation method is characterized by comprising the following steps: in step S2, the metal hydroxide and thioacetamide are mixed according to the mass ratio of Cu to S being 1: 3-5, and are dissolved in deionized water with the same volume portion as the mixed solution in step S1.
8. The visible-light-responsive photocatalyst CuS/In of claim 12S3@C3N4The preparation method is characterized by comprising the following steps: in step S2, the reaction product obtained after the heating reaction is further centrifuged at 1000rpm for 25-35 min, washed with deionized water and absolute ethyl alcohol, and then subjected toDrying at 55-65 ℃ for 11-13 hours, roasting at 500-600 ℃ for 3-6 hours, naturally cooling to room temperature, and grinding to obtain CuS/In2S3@C3N4。
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