CN111203265A - Heterojunction composite visible light catalyst and preparation method thereof - Google Patents
Heterojunction composite visible light catalyst and preparation method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000003054 catalyst Substances 0.000 title description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000008367 deionised water Substances 0.000 claims abstract description 50
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 50
- 239000011941 photocatalyst Substances 0.000 claims abstract description 40
- 238000003756 stirring Methods 0.000 claims abstract description 36
- 239000000243 solution Substances 0.000 claims abstract description 33
- 230000002378 acidificating effect Effects 0.000 claims abstract description 27
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims abstract description 22
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 17
- 238000010335 hydrothermal treatment Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- RXPAJWPEYBDXOG-UHFFFAOYSA-N hydron;methyl 4-methoxypyridine-2-carboxylate;chloride Chemical compound Cl.COC(=O)C1=CC(OC)=CC=N1 RXPAJWPEYBDXOG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000007864 aqueous solution Substances 0.000 claims abstract description 10
- 238000003760 magnetic stirring Methods 0.000 claims abstract description 6
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 4
- 239000000725 suspension Substances 0.000 claims description 30
- 238000006243 chemical reaction Methods 0.000 claims description 17
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 15
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 claims description 14
- 150000001621 bismuth Chemical class 0.000 claims description 13
- 238000000862 absorption spectrum Methods 0.000 claims description 12
- -1 polytetrafluoroethylene Polymers 0.000 claims description 12
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 12
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 12
- 238000001556 precipitation Methods 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 238000013329 compounding Methods 0.000 claims description 8
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 claims description 7
- 229960004889 salicylic acid Drugs 0.000 claims description 7
- 229910000014 Bismuth subcarbonate Inorganic materials 0.000 claims description 6
- FBXVOTBTGXARNA-UHFFFAOYSA-N bismuth;trinitrate;pentahydrate Chemical compound O.O.O.O.O.[Bi+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FBXVOTBTGXARNA-UHFFFAOYSA-N 0.000 claims description 6
- FWIZHMQARNODNX-UHFFFAOYSA-L dibismuth;oxygen(2-);carbonate Chemical compound [O-2].[O-2].[Bi+3].[Bi+3].[O-]C([O-])=O FWIZHMQARNODNX-UHFFFAOYSA-L 0.000 claims description 6
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 6
- 239000002135 nanosheet Substances 0.000 claims description 6
- 241000446313 Lamella Species 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 241000764238 Isis Species 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000003197 catalytic effect Effects 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 230000001699 photocatalysis Effects 0.000 description 9
- 239000000969 carrier Substances 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
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- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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- 239000002086 nanomaterial Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000002371 ultraviolet--visible spectrum Methods 0.000 description 1
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Abstract
The invention relates to a heterojunction composite visible-light-driven photocatalyst and a preparation method thereof, wherein the molecular formula of the heterojunction composite visible-light-driven photocatalyst is Bi6O6(OH)3(NO3)3‑Bi2WO6The morphology is a 3D flower-like superstructure composed of lamellae. Preparing a bismuth nitrate aqueous solution with a certain concentration in acidic deionized water; then slowly dropwise adding the sodium tungstate solution into the bismuth nitrate solution under magnetic stirring, and stirring until the solution becomes clear; adding CTAB (cetyltrimethyl ammonium bromide) for ultrasonic dispersion; and carrying out one-step hydrothermal treatment to obtain the composite photocatalyst. The preparation method provided by the invention has the advantages of no environmental pollution, simple and convenient process and flow, wide parameter adjustable range, strong repeatability and low production cost, and can be used for large-batch productionAnd (5) industrial-grade production. The prepared composite photocatalyst has the characteristics of high quantum efficiency, large specific surface area and high catalytic efficiency.
Description
Technical Field
The invention relates to a heterojunction composite visible-light-driven photocatalyst and a preparation method thereof, belonging to the field of nanometer preparation.
Background
The photocatalysis technology is an environment control technology which utilizes sunlight, has no secondary pollution and can thoroughly decompose organic pollutants. It has been developed for more than 30 years to attract more and more attention of researchers, but in general, the photocatalytic technology is still in the stage of theoretical research and experimental exploration. Among them, insufficient utilization of visible light and low quantum efficiency of the catalyst become major factors that restrict the development of photocatalytic technology. Therefore, it is urgent to develop a photocatalytic technology to expand a photoresponse range of a photocatalyst and to improve quantum efficiency of the catalyst.
Bi2WO6It is the simplest member of the Aurivillius family of oxides, with a perovskite-like structure, because of its wide interest in having visible light photocatalytic properties. Bi2WO6The crystal is composed of [ WO4]2-And [ Bi ]2O2]2+The structural unit is formed and has a layered structure. The layered structure is beneficial to the transfer of photon-generated carriers in the photocatalysis process, and the quantum efficiency of the photocatalyst is improved. However, in fact Bi alone2WO6The photocatalytic performance of (a) is still not ideal enough.
Increase Bi2WO6The method of photocatalyst performance is mainly manifested in two aspects:
1) increase Bi2WO6Specific surface area of the photocatalyst. Since the photocatalytic reaction is mainly a first-order or second-order kinetic reaction, the adsorption of pollutants on the surface of the catalyst is the first step of ensuring the catalytic reaction. Experiments prove that the 3D self-assembled nano structure has larger specific surface area.
2) The quantum efficiency of the catalyst is improved. The oxidative species which play a role in degradation in the photocatalytic process are generated by photo-generated electrons and photo-generated holes, so that the key for improving the quantum efficiency of the catalyst is to prevent the recombination of the photo-generated electrons and the photo-generated holes. In this respect, since the energy band positions of the heterojunction type photocatalyst are matched with each other, photogenerated carriers can be timely transferred from one semiconductor surface to another semiconductor surface in the photocatalytic process, and photogenerated electrons and photogenerated holes are effectively separated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a heterojunction composite visible-light-driven photocatalyst with a molecular formula of Bi6O6(OH)3(NO3)3-Bi2WO6。
Yet another object of the present invention is to: provides a preparation method of the heterojunction composite visible-light-driven photocatalyst product.
The purpose of the invention is realized by the following scheme: a heterojunction composite visible-light-driven photocatalyst with a molecular formula of Bi6O6(OH)3(NO3)3-Bi2WO6The morphology of the structure is a 3D flower-shaped superstructure consisting of lamellar layers.
The invention provides a preparation method of a heterojunction composite visible-light-driven photocatalyst, which adopts a one-step hydrothermal method to prepare a bismuth nitrate aqueous solution with a certain concentration in acidic deionized water; then slowly dropwise adding the sodium tungstate solution into the bismuth nitrate solution under magnetic stirring, and stirring until the solution becomes clear; adding CTAB (cetyltrimethyl ammonium bromide) for ultrasonic dispersion; and a composite photocatalyst is obtained through one-step hydrothermal treatment, and the method comprises the following steps:
(1) preparing a bismuth salt aqueous solution with a certain concentration in acidic deionized water with the pH of 3-5; then slowly dropwise adding the sodium tungstate solution into the bismuth nitrate solution under magnetic stirring, so that the molar ratio of sodium tungstate to bismuth salt is 1: (1-3), stirring until the total volume of the reaction solution is 70ml and the solution becomes clear; adding 0.1-0.5mmol CTAB, and ultrasonic dispersing for 30 min;
(2) putting the suspension obtained in the step (1) into a stainless steel autoclave lined with polytetrafluoroethylene, and carrying out hydrothermal treatment for 12-24 h at the temperature of 373-473K;
(3) after the reaction is stopped, the precipitation product is washed by deionized water and dried to obtain flower-shaped Bi6O6(OH)3(NO3)3-Bi2WO6And (4) compounding heterocrystals.
Wherein, in the step (1), the bismuth salt is anhydrous or bismuth nitrate with crystal water, bismuth oxycarbonate, or a mixture of the bismuth salts.
Further, the preparation method of the acidic deionized water in the step (1) is to add citric acid or salicylic acid into the deionized water until the pH value is 3-5.
In view of Bi2WO6The invention provides a way for improving the performance of a photocatalyst and the current research situation, and the invention prepares a Bi6O6(OH)3(NO3)3-Bi2WO6 heterojunction composite visible-light-driven photocatalyst, and the absorption spectrum of the composite visible-light-driven photocatalyst is more than 550 nm.
The invention has the advantages that: the heterojunction composite visible-light-driven photocatalyst with high quantum efficiency and large specific surface area is prepared by a one-step hydrothermal method. The heterojunction composite photocatalyst prepared by the preparation method is in a 3D flower-shaped superstructure, has high photoelectric and catalytic performances, high chemical stability, high purity and high crystallinity, and has wide application prospects in the fields of industrial catalysis, medical industry, special glass manufacturing industry, electronic industry, new materials and the like.
Drawings
FIG. 1 shows the UV-VIS absorption spectra of the visible-light-induced photocatalyst obtained according to examples 1 to 5, wherein the molar ratios of sodium tungstate and bismuth salt are 1:1, 1:1.5, 1:2, 1:2.5 and 1:3, respectively.
Detailed Description
The following examples illustrate the invention in detail: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and an operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
Example 1
A heterojunction composite visible light catalyst adopts a one-step hydrothermal method to prepare a bismuth nitrate aqueous solution in acidic deionized water; then slowly dropwise adding the sodium tungstate solution into the bismuth nitrate solution under magnetic stirring, and stirring until the solution becomes clear; adding CTAB (cetyltrimethyl ammonium bromide) for ultrasonic dispersion; the composite photocatalyst is obtained through one-step hydrothermal treatment and prepared according to the following steps:
(1) adding citric acid into 50ml of deionized water, and adjusting the pH value to 3 to obtain acidic deionized water; adding 1mmol of bismuth oxycarbonate into the acidic deionized water to prepare a bismuth salt aqueous solution; then, after primary stirring, adding 1mmol of sodium tungstate, and rapidly stirring while adding to form uniform suspension; then adjusting the total volume of the suspension to 70ml, and stirring until the solution becomes clear; adding 0.1mmol Cetyl Trimethyl Ammonium Bromide (CTAB) and ultrasonic dispersing for 30 min;
(2) putting the suspension obtained in the step (1) into a stainless steel autoclave with a volume of 100 ml and a polytetrafluoroethylene lining, and carrying out hydrothermal reaction for 24h at a temperature of 383K;
(3) after the reaction is stopped, the precipitation product is washed by deionized water, and the product is flower-shaped Bi after drying6O6(OH)3(NO3)3-Bi2WO6And (4) compounding heterocrystals.
The shape of the flower ball is a flower ball superstructure consisting of nano sheets, the thickness of the sheet layer is 10nm, the diameter of the flower ball is about 1 mu m, and the absorption spectrum is expanded to 550 nm. The ultraviolet and visible absorption spectrum of the obtained visible-light-driven photocatalyst is shown in figure 1.
Example 2
A heterojunction composite visible-light-driven photocatalyst is similar to that in example 1, and is prepared by the following steps:
(1) adding salicylic acid into 50ml of deionized water, and adjusting the pH value to 5 to obtain acidic deionized water; adding 1.5mmol of bismuth nitrate pentahydrate into acidic deionized water to prepare a bismuth salt aqueous solution; then, after primary stirring, adding 1mmol of sodium tungstate, rapidly stirring while adding to form uniform suspension, then adjusting the total volume of the suspension to 70ml, and stirring until the solution becomes clear; adding 0.3mmol CTAB, and ultrasonically dispersing for 30 min;
(2) putting the suspension obtained in the step (1) into a stainless steel autoclave with a capacity of 100 ml and a polytetrafluoroethylene lining, and carrying out hydrothermal treatment at the temperature of 473K for 12 h;
(3) after the reaction is stopped, the precipitation product is washed by deionized water and dried to obtain flower-shaped Bi6O6(OH)3(NO3)3-Bi2WO6And (4) compounding heterocrystals.
The flower ball is in a flower ball superstructure composed of nanosheets, the thickness of the lamella is 15nm, the diameter of the flower ball is 1-2 mu m, and the absorption spectrum is expanded to 570 nm. The ultraviolet and visible absorption spectrum of the obtained visible-light-driven photocatalyst is shown in figure 1.
Example 3
A heterojunction composite visible-light-driven photocatalyst is similar to that in example 1, and is prepared by the following steps:
(1) adding salicylic acid into 50ml of deionized water, and adjusting the pH value to 4 to obtain acidic deionized water; adding 2mmol of bismuth nitrate pentahydrate into acidic deionized water; after primary stirring, adding 1mmol of sodium tungstate, rapidly stirring while adding to form uniform suspension, then adjusting the total volume of the suspension to 70ml, and stirring until the solution becomes clear; adding 0.4mmol CTAB, and ultrasonically dispersing for 30 min;
(2) putting the suspension obtained in the step (1) into a stainless steel autoclave with a volume of 100 ml and a polytetrafluoroethylene lining, and carrying out hydrothermal treatment at a temperature of 413K for 18 h;
(3) after the reaction is stopped, the precipitation product is washed by deionized water and dried to obtain flower-shaped Bi6O6(OH)3(NO3)3-Bi2WO6And (4) compounding heterocrystals.
The flower ball is a flower ball superstructure composed of nanosheets, the thickness of the lamella is 10-15nm, the diameter of the flower ball is about 2 mu m, and the absorption spectrum is expanded to 570 nm. The ultraviolet and visible absorption spectrum of the obtained visible-light-driven photocatalyst is shown in figure 1.
Example 4
A heterojunction composite visible-light-driven photocatalyst is similar to that in example 1, and is prepared by the following steps:
(1) adding citric acid into 50ml of deionized water, and adjusting the pH value to 4 to obtain acidic deionized water; adding 3mmol of bismuth nitrate pentahydrate into acidic deionized water, primarily stirring, adding 1mmol of sodium tungstate, rapidly stirring while adding to form uniform suspension, wherein the total volume of the reaction solution is 70ml, and stirring until the solution becomes clear; adding 0.5mmol CTAB, and ultrasonic dispersing for 30 min;
(2) putting the suspension obtained in the step (1) into a stainless steel autoclave with a volume of 100 ml and a polytetrafluoroethylene lining, and carrying out hydrothermal treatment at a temperature of 413K for 15 h;
(3) after the reaction is stopped, the precipitation product is washed by deionized water and dried to obtain flower-shaped Bi6O6(OH)3(NO3)3-Bi2WO6A composite heterocrystalline product.
The shape of the flower ball is a flower ball superstructure consisting of nano sheets, the thickness of the sheet layer is 10-15nm, the diameter of the flower ball is about 2 mu m, and the absorption spectrum is expanded to 580 nm. The ultraviolet and visible absorption spectrum of the obtained visible-light-driven photocatalyst is shown in figure 1.
Example 5
A heterojunction composite visible-light-driven photocatalyst is similar to that in example 1, and is prepared by the following steps:
(1) adding salicylic acid into 50ml of deionized water, and adjusting the pH value to 4 to obtain acidic deionized water; adding 2.5mmol of bismuth oxycarbonate into acidic deionized water, primarily stirring, adding 1mmol of sodium tungstate, rapidly stirring while adding to form uniform suspension, adjusting the total volume of the suspension to 70ml, and stirring until the solution becomes clear; adding 0.25mmol CTAB, and ultrasonic dispersing for 30 min;
(2) putting the suspension obtained in the step (1) into a stainless steel autoclave with a volume of 100 ml and a polytetrafluoroethylene lining, and carrying out hydrothermal treatment at a temperature of 413K for 18 h;
(3) after the reaction is stopped, the precipitation product is washed by deionized water and dried to obtain flower-shaped Bi6O6(OH)3(NO3)3-Bi2WO6A composite heterocrystalline product.
The shape of the flower ball is a flower ball superstructure consisting of nanosheets, the thickness of the lamella is 10-15nm, the diameter of the flower ball is about 2 mu m, and the absorption spectrum is expanded to 575 nm. The ultraviolet and visible absorption spectrum of the obtained visible-light-driven photocatalyst is shown in figure 1.
Claims (8)
1. A heterojunction composite visible-light-driven photocatalyst with a molecular formula of Bi6O6(OH)3(NO3)3-Bi2WO6Which isIs characterized in that the morphology is a 3D flower-like superstructure composed of lamellae.
2. The preparation method of the heterojunction composite visible-light-driven photocatalyst according to claim 1, wherein a one-step hydrothermal method is adopted, and a bismuth nitrate aqueous solution is prepared in acidic deionized water; then slowly dropwise adding the sodium tungstate solution into the bismuth nitrate solution under magnetic stirring, and stirring until the solution becomes clear; adding CTAB (cetyltrimethyl ammonium bromide) for ultrasonic dispersion; and a composite photocatalyst is obtained through one-step hydrothermal treatment, and the method comprises the following steps:
(1) preparing a bismuth salt aqueous solution with a certain concentration in acidic deionized water with the pH of 3-5; then slowly dropwise adding the sodium tungstate solution into the bismuth nitrate solution under magnetic stirring, so that the molar ratio of sodium tungstate to bismuth salt is 1: (1-3), stirring until the total volume of the reaction solution is 70ml and the solution becomes clear; adding 0.1-0.5mmol CTAB, and ultrasonic dispersing for 30 min;
(2) putting the suspension obtained in the step (1) into a stainless steel autoclave lined with polytetrafluoroethylene, and carrying out hydrothermal treatment for 12-24 h at the temperature of 373-473K;
(3) after the reaction is stopped, the precipitation product is washed by deionized water and dried to obtain flower-shaped Bi6O6(OH)3(NO3)3-Bi2WO6And (4) compounding heterocrystals.
3. The method for preparing the heterojunction composite visible-light-driven photocatalyst according to claim 2, wherein: the bismuth salt in the step (1) is anhydrous or bismuth nitrate with crystal water, bismuth oxycarbonate or a mixture of the bismuth salts.
4. The method for preparing the heterojunction composite visible-light-driven photocatalyst according to claim 2 or 3, wherein: comprises the following steps:
(1) adding citric acid into 50ml of deionized water, and adjusting the pH value to 3 to obtain acidic deionized water; adding 1mmol of bismuth oxycarbonate into the acidic deionized water to prepare a bismuth salt aqueous solution; then, after primary stirring, adding 1mmol of sodium tungstate, and rapidly stirring while adding to form uniform suspension; then adjusting the total volume of the suspension to 70ml, and stirring until the solution becomes clear; adding 0.1mmol Cetyl Trimethyl Ammonium Bromide (CTAB) and ultrasonic dispersing for 30 min;
(2) putting the suspension obtained in the step (1) into a stainless steel autoclave with a volume of 100 ml and a polytetrafluoroethylene lining, and carrying out hydrothermal reaction for 24h at a temperature of 383K;
(3) after the reaction is stopped, the precipitation product is washed by deionized water, and the product is flower-shaped Bi after drying6O6(OH)3(NO3)3-Bi2WO6And (4) compounding heterocrystals.
5. The method for preparing the heterojunction composite visible-light-driven photocatalyst according to claim 2 or 3, wherein: comprises the following steps:
(1) adding salicylic acid into 50ml of deionized water, and adjusting the pH value to 5 to obtain acidic deionized water; adding 1.5mmol of bismuth nitrate pentahydrate into acidic deionized water to prepare a bismuth salt aqueous solution; then, after primary stirring, adding 1mmol of sodium tungstate, rapidly stirring while adding to form uniform suspension, then adjusting the total volume of the suspension to 70ml, and stirring until the solution becomes clear; adding 0.3mmol CTAB, and ultrasonically dispersing for 30 min;
(2) putting the suspension obtained in the step (1) into a stainless steel autoclave with a capacity of 100 ml and a polytetrafluoroethylene lining, and carrying out hydrothermal treatment at the temperature of 473K for 12 h;
(3) after the reaction is stopped, the precipitation product is washed by deionized water and dried to obtain flower-shaped Bi6O6(OH)3(NO3)3-Bi2WO6And (4) compounding heterocrystals.
6. The method for preparing the heterojunction composite visible-light-driven photocatalyst according to claim 2 or 3, wherein: comprises the following steps:
(1) adding salicylic acid into 50ml of deionized water, and adjusting the pH value to 4 to obtain acidic deionized water; adding 2mmol of bismuth nitrate pentahydrate into acidic deionized water; after primary stirring, adding 1mmol of sodium tungstate, rapidly stirring while adding to form uniform suspension, then adjusting the total volume of the suspension to 70ml, and stirring until the solution becomes clear; adding 0.4mmol CTAB, and ultrasonically dispersing for 30 min;
(2) putting the suspension obtained in the step (1) into a stainless steel autoclave with a volume of 100 ml and a polytetrafluoroethylene lining, and carrying out hydrothermal treatment at a temperature of 413K for 18 h;
(3) after the reaction is stopped, the precipitation product is washed by deionized water and dried to obtain flower-shaped Bi6O6(OH)3(NO3)3-Bi2WO6And (4) compounding heterocrystals.
7. The method for preparing the heterojunction composite visible-light-driven photocatalyst according to claim 2 or 3, wherein: comprises the following steps:
(1) adding citric acid into 50ml of deionized water, and adjusting the pH value to 4 to obtain acidic deionized water; adding 3mmol of bismuth nitrate pentahydrate into acidic deionized water, primarily stirring, adding 1mmol of sodium tungstate, rapidly stirring while adding to form uniform suspension, wherein the total volume of the reaction solution is 70ml, and stirring until the solution becomes clear; adding 0.5mmol CTAB, and ultrasonic dispersing for 30 min;
(2) putting the suspension obtained in the step (1) into a stainless steel autoclave with a volume of 100 ml and a polytetrafluoroethylene lining, and carrying out hydrothermal treatment at a temperature of 413K for 15 h;
(3) after the reaction is stopped, the precipitation product is washed by deionized water and dried to obtain flower-shaped Bi6O6(OH)3(NO3)3-Bi2WO6A composite heterocrystalline product.
8. The method for preparing the heterojunction composite visible-light-driven photocatalyst according to claim 2 or 3, wherein: comprises the following steps:
(1) adding salicylic acid into 50ml of deionized water, and adjusting the pH value to 4 to obtain acidic deionized water; adding 2.5mmol of bismuth oxycarbonate into acidic deionized water, primarily stirring, adding 1mmol of sodium tungstate, rapidly stirring while adding to form uniform suspension, adjusting the total volume of the suspension to 70ml, and stirring until the solution becomes clear; adding 0.25mmol CTAB, and ultrasonic dispersing for 30 min;
(2) putting the suspension obtained in the step (1) into a stainless steel autoclave with a volume of 100 ml and a polytetrafluoroethylene lining, and carrying out hydrothermal treatment at a temperature of 413K for 18 h;
(3) after the reaction is stopped, the precipitation product is washed by deionized water and dried to obtain flower-shaped Bi6O6(OH)3(NO3)3-Bi2WO6A composite heterocrystalline product.
The shape of the flower ball is a flower ball superstructure consisting of nanosheets, the thickness of the lamella is 10-15nm, the diameter of the flower ball is about 2 mu m, and the absorption spectrum is expanded to 575 nm.
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