CN114247452A - Bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst and preparation method and application thereof - Google Patents
Bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst and preparation method and application thereof Download PDFInfo
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- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000002131 composite material Substances 0.000 title claims abstract description 50
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 46
- -1 Bismuth-bismuth sulfide-bismuth Chemical compound 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 54
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 39
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 19
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims abstract description 19
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 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 18
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- 229910052797 bismuth Inorganic materials 0.000 abstract description 26
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- 230000001699 photocatalysis Effects 0.000 description 19
- NNLOHLDVJGPUFR-UHFFFAOYSA-L calcium;3,4,5,6-tetrahydroxy-2-oxohexanoate Chemical compound [Ca+2].OCC(O)C(O)C(O)C(=O)C([O-])=O.OCC(O)C(O)C(O)C(=O)C([O-])=O NNLOHLDVJGPUFR-UHFFFAOYSA-L 0.000 description 14
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- RBWFXUOHBJGAMO-UHFFFAOYSA-N sulfanylidenebismuth Chemical group [Bi]=S RBWFXUOHBJGAMO-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
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- 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
- B01J27/047—Sulfides with chromium, molybdenum, tungsten or polonium
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- 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
- C02F2101/34—Organic compounds containing oxygen
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/44—Time
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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
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- C02F2305/10—Photocatalysts
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Abstract
The invention discloses a bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst and a preparation method and application thereof. Respectively dissolving bismuth nitrate and sodium tungstate in ethylene glycol, and dissolving thiourea in an ethanol solution; mixing the three solutions to obtain a precursor solution; and carrying out solvothermal reaction on the precursor solution, washing and drying the black precipitate obtained by the reaction to obtain the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst. The invention synthesizes the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst by regulating and controlling the proportion of thiourea and sodium tungstate, simultaneously utilizing a reducing additive to generate metal bismuth and utilizing a solvothermal method in one pot. The invention has the advantages of simple preparation, easily obtained raw materials, low production cost and environmental protection. The bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst has the advantages of wide visible light absorption range, low photo-generated carrier recombination rate, stable performance and high activity of photocatalytic degradation of plasticizer, and has wide application prospect in the aspects of visible light utilization and environmental protection.
Description
Technical Field
The invention relates to the technical field, and particularly relates to a bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst as well as a preparation method and application thereof.
Background
With the increase of population and the development of economic society, the environmental pollution problem becomes more serious. A large amount of environmental pollutants which are difficult to naturally degrade cause damage to the living environment of animals and plants and threaten the health of human beings. In order to solve the problem of environmental pollution, various technical means are used to promote the degradation of pollutants, wherein the photocatalytic technology utilizes light energy to degrade the pollutants, so that the photocatalytic technology is more economical and environment-friendly, and is widely accepted by people. The photocatalytic degradation technology is that a photocatalytic semiconductor material is combined, an electron-hole pair is generated under the irradiation of ultraviolet light or visible light, then the electron-hole pair reacts with oxygen or water through the reducibility and the oxidizability of electrons and holes to generate superoxide radical or hydroxyl radical, and then the active radicals are utilized to attack pollutants to convert the pollutants into nontoxic substances. The organic matter in the wastewater can undergo photocatalytic oxidation reaction, so that most of the organic matter which is difficult to degrade is oxidized or coupled, and finally the organic matter is degraded into carbon dioxide and water. The core of the photocatalytic technology is photocatalytic materials, and therefore, development of photocatalytic materials with excellent performance is a major research point.
Among numerous semiconductor photocatalysts, bismuth-based semiconductor materials have received much attention due to their excellent chemical and thermal stability, non-toxicity, and unique band structure. Bismuth tungstate (Bi)2WO6) One of p-type semiconductor materials has a perovskite lamellar structure, has a band gap of about 2.7eV, has strong absorption in the visible light region having a wavelength of more than 420nm, and is highly favored by researchers because it can utilize both ultraviolet light and visible light in sunlight. However, the rapid recombination and the weak surface adsorption capacity of the photo-generated electron-hole pairs enable Bi to be generated2WO6The photocatalytic efficiency of the bismuth sulfide (Bi) is low, so that a composite photocatalyst with effectively improved performance is needed, the separation efficiency of a photogenerated carrier is further improved, the catalytic activity is enhanced, and the bismuth sulfide (Bi) is matched with an energy band2S3) The heterojunction is constructed, and simultaneously, the metal bismuth capable of promoting electron transmission is introduced, so that the recombination of photo-generated electrons and holes is effectively inhibited, and the photocatalytic activity is greatly improved.
Disclosure of Invention
Aiming at the prior art, the invention aims to provide a bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst and a preparation method and application thereof. The composite photocatalyst has the advantages of wide visible light absorption range, excellent photocatalytic performance, good stability and strong reusability; the preparation method has mild reaction conditions, simple operation flow and environmental protection, and can be used for preparing the bismuth-bismuth sulfide-bismuth tungstate composite photocatalytic material in a large scale.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of a bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst, which is characterized by comprising the following steps of:
(1) respectively dissolving bismuth nitrate and sodium tungstate in ethylene glycol to obtain a solution A and a solution B, and dissolving thiourea in ethanol to obtain a solution C; sequentially adding the solution B and the solution C into the solution A, and uniformly stirring to obtain a precursor solution;
(2) carrying out solvothermal reaction on the precursor solution, washing and drying the black precipitate obtained by the reaction to obtain the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst, which is recorded as Bi-Bi2S3-Bi2WO6。
Preferably, in the step (1), the bismuth nitrate is dissolved in ethylene glycol by ultrasonic dissolution to obtain a solution A; dissolving the sodium tungstate in ethylene glycol through ultrasonic dissolution to obtain a solution B; dissolving the thiourea in ethanol by ultrasonic dissolution to obtain a solution C; the ultrasonic dissolving time is 10-30 min.
Preferably, in the step (1), the concentration of bismuth nitrate in the solution A is 0.1-3M; the concentration of sodium tungstate in the solution B is 0.01-1M; the concentration of thiourea in the solution C is 0.005-2M.
Preferably, in the step (1), the stirring time is 10-60 min.
Preferably, in step (1), the molar ratio of bismuth nitrate, sodium tungstate and thiourea in the precursor solution is 2.1:1, (0.3-3).
Preferably, in the step (2), the temperature of the solvothermal reaction is 140-220 ℃ and the time is 3-24 hours.
Preferably, in the step (2), the drying temperature is 60-90 ℃, and the drying time is 8-24 hours.
In a second aspect of the invention, the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst prepared by the preparation method is provided.
In a third aspect of the invention, an application of the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst in photocatalytic degradation of a plasticizer is provided.
The invention has the beneficial effects that:
the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst is prepared by a one-step synthesis method, and is simple in preparation method and high in controllability. The prepared bismuth-bismuth sulfide-bismuth tungstate composite catalyst has stable performance, and shows higher catalytic activity and higher catalytic efficiency compared with single bismuth tungstate and bismuth sulfide. Compared with other conventional methods, the preparation method disclosed by the invention is mild in required conditions and simple to operate, and the prepared material is high in crystallization degree and difficult to change in properties. The preparation method has the advantages of mild reaction conditions, simple operation flow, environmental protection and the like, can be used for large-scale preparation, is convenient for industrial utilization, and has good application prospect.
Drawings
FIG. 1: bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst (Bi/Bi) prepared in example2S3/Bi2WO6) XRD pattern of (a).
FIG. 2: SEM representation picture of the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst prepared in the embodiment.
FIG. 3: bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst, bismuth sulfide-bismuth tungstate composite (Bi)2S3/Bi2WO6) Bismuth sulfide (Bi) alone2S3) And bismuth tungstate (Bi) alone2WO6) Respectively, photocatalytic degradation curves for plasticizer dibutyl phthalate.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
As described in the background section, Bi alone2WO6Has low photocatalytic efficiency, Bi2S3And Bi2WO6The heterostructure formed by compounding is beneficial to absorbing and widening spectrum, promoting generation of photon-generated carriers and effectively inhibiting recombination of electron hole pairs, but at the initial stage of photocatalytic reaction, the system absorbs energy, and the photocatalyst initiates generation of intermediate products such as h+OH and O2 -And the like. Bi2S3/Bi2WO6The heterojunction catalyst lacks the modification of metal Bi and has no surface plasma effect, resulting in Bi2S3/Bi2WO6In the formation of heterojunctionsFewer intermediates, react slowly with contaminants, so that the rate of contaminant degradation is reduced.
Based on the above, the invention aims to provide a bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst, and a preparation method and application thereof. The invention adopts a one-step solvothermal method, and uses bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst prepared from bismuth nitrate, sodium tungstate and thiourea to enable bismuth, bismuth tungstate and bismuth sulfide to form a heterojunction compound. The metal bismuth has a plasma resonance effect, can improve the absorption of visible light, and plays a role of an electron trap to promote the separation of photo-generated electrons and holes; the initial temperature of the photocatalytic reaction can be improved, so that the photocatalytic reaction is easier to carry out; meanwhile, Bi is used as an electron trapping agent, so that the separation of electrons and holes is facilitated, and the activity of the photocatalyst can be further improved. Bismuth tungstate and bismuth sulfide form a staggered energy band structure, so that photoproduction electrons and holes can be quickly transferred to the surfaces of different substances, and are effectively separated, and the photocatalytic performance is further improved. The bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst prepared by the invention can be used as a photocatalyst for sewage treatment, and particularly has a strong photodegradation effect on plasticizer pollutants in water, so that the bismuth sulfide-bismuth tungstate composite photocatalyst has a wide application prospect in the field of sewage treatment, and particularly has a strong visible light degradation effect on plasticizer dibutyl phthalate in water.
By regulating and controlling conditions such as reaction time, temperature, reagent proportion and the like, bismuth nitrate can react with sodium tungstate to generate bismuth tungstate and also react with thiourea to generate bismuth sulfide; meanwhile, under the action of reducing auxiliary agent ethylene glycol, trivalent bismuth is reduced to generate metal bismuth, so that the one-pot synthesis of the bismuth-bismuth sulfide-bismuth tungstate compound is realized. In the whole process, bismuth nitrate serves as a bismuth source, sodium tungstate serves as a tungsten source, and thiourea serves as a sulfur source. Previously prepared Bi has been reported2WO6Microspherical particles of recycled Bi2WO6Preparation of Bi from microspheroidal particles and thiourea2S3/Bi2WO6Heterojunction (see: preparation of bismuth sulfide/bismuth tungstate composite catalyst and its photocatalytic nitrogen fixation performance (Wangyitong, etc.)), but this method requires two-step preparationThe preparation method can complete the preparation only by one step, is simpler and more convenient, and saves time. And Bi2WO6The particle size of the microsphere particles is larger, so that Bi is carried out2S3/Bi2WO6The heterojunction is difficult to be uniformly combined with the generated bismuth sulfide in the preparation process, and the prepared composite material is more compact and uniform due to the one-step preparation of the heterojunction. In the present invention, ethylene glycol has two functions: the bismuth-bismuth sulfide-bismuth tungstate composite catalyst is used as a reducing auxiliary agent to reduce trivalent bismuth into metal bismuth and is used as a source of the metal bismuth in the synthesis of a bismuth-bismuth sulfide-bismuth tungstate composite catalyst; and secondly, the ethylene glycol can be used for dissolving the bismuth nitrate and the sodium tungstate, so that the bismuth nitrate and the sodium tungstate are uniformly dispersed in the precursor solution. The ethanol is used for dissolving thiourea and promoting the thiourea to be uniformly dispersed in the precursor solution. The replacement of other solvents is not only considered to influence the generation of other components in the composite catalyst, but also may cause the change of the morphology of the composite catalyst, and further may influence the photocatalytic effect, so that other solvents can be replaced at will.
The bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst prepared by the invention is used for treating sewage, and is particularly used for treating plasticizer dibutyl phthalate in water. The method specifically comprises the following steps: the dibutyl phthalate solution is adopted as a typical sewage solution, the composite photocatalyst powder is added into the sewage solution after being subjected to ultrasonic dispersion, and dark treatment is carried out for a period of time to achieve adsorption-desorption balance. Placing the dibutyl phthalate solution containing the composite photocatalyst and having saturated adsorption under a xenon lamp with a 420nm optical filter, collecting samples under simulated solar illumination, analyzing by using liquid chromatography, recording the absorption peak area of each time point, and calculating the concentration C of the sampling time point according to a dibutyl phthalate standard curvet. Plotting time-Ct/C0And (5) taking a curve to investigate the photocatalytic performance of the composite photocatalyst.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
The test materials used in the examples of the present invention are all conventional in the art and commercially available.
Example (b): preparation of bismuth-bismuth sulfide-bismuth tungstate compound
(1) Preparing an ethylene glycol solution A of bismuth nitrate with the concentration of 0.2M; preparing an ethylene glycol solution B of sodium tungstate with the concentration of 0.1M and an ethanol solution C of thiourea with the concentration of 0.01M, wherein the molar ratio of the bismuth nitrate to the sodium tungstate to the thiourea is 2.1:1: 0.6;
(2) adding an ethylene glycol solution B of sodium tungstate into an ethylene glycol solution A of bismuth nitrate under the stirring state, adding an ethanol solution C of thiourea into the ethylene glycol solution A of bismuth nitrate, and stirring for 15min to obtain a uniform precursor solution;
(3) transferring the mixed solution into a polytetrafluoroethylene inner container with a steel sleeve, and placing the inner container into an oven for solvothermal reaction at the reaction temperature of 180 ℃ for 9 hours;
(4) centrifuging the prepared reactant, sequentially centrifuging and cleaning the reactant for 3 times by using deionized water and ethanol, and drying the reactant for 10 hours at the temperature of 60 ℃ to obtain a bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst powder sample.
The structure representation of the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst is as follows:
x-ray diffraction (XRD) is adopted to represent the structure of the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst, and the spectrum is shown in figure 1. Referring to fig. 1, it was confirmed that the compound was composed of three components of bismuth, bismuth sulfide and bismuth tungstate.
The structure of the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst was observed by Scanning Electron Microscopy (SEM), and the result is shown in fig. 2. Fig. 2 shows that the ternary complex has a structure assembled by bismuth tungstate nanosheets and bismuth sulfide nanorods, and some metal bismuth nanoparticles are distributed in the nanosheets. The structure effectively improves the specific surface area of the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst, which is beneficial to playing the photocatalytic degradation role of the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst on pollutants.
The compound in the embodiment consists of bismuth-bismuth sulfide-bismuth tungstate, and the visible light absorption range of the whole compound is increased by utilizing the capability of the bismuth sulfide for easily absorbing visible light; meanwhile, bismuth sulfide and bismuth tungstate can form a heterojunction, so that recombination of photo-generated electron-hole pairs is reduced. In addition, due to the existence of the metal bismuth, a surface plasmon resonance effect is formed, so that the visible light absorption is enhanced, and the separation efficiency of photon-generated carriers is improved.
Comparative example 1
A composite material was prepared according to the same method as in example except that deionized water was used instead of the ethylene glycol solvent. The bismuth sulfide-bismuth tungstate compound is prepared.
Comparative example 2
A single material was prepared according to the same method as in the example, except that the ethylene glycol solvent was replaced with deionized water and the sodium tungstate addition was zero. The single bismuth sulfide is prepared.
Comparative example 3
A single material was prepared according to the same method as in the example except that the ethylene glycol solvent was replaced with deionized water and the thiourea addition was zero. The single bismuth tungstate is prepared.
Performance testing
The photocatalysts prepared in the examples and the comparative examples 1-3 are used for sewage treatment, and photocatalytic performance tests are carried out on sewage samples.
120mL of dibutyl phthalate solution is taken as a sewage sample, and the sewage sample is divided into 4 parts on average, wherein each part is 30mL and the concentration is 10 mg/L. 30mg of the photocatalysts prepared in the examples and the comparative examples 1 to 3 are added to each dibutyl phthalate solution in sequence. Under magnetic stirring, the dark reaction is carried out for 1 hour to reach the adsorption-desorption equilibrium. Placing the dibutyl phthalate solution containing the photocatalyst and having saturated adsorption under a xenon lamp equipped with a 420nm optical filter, collecting samples at each time point, testing the absorption peak area by using liquid chromatography, and calculating the concentration C of the solution at each time point according to the standard curve of the dibutyl phthalate solutiont. Plotting time-Ct/C0And (5) taking a curve to investigate the photocatalytic performance of the composite photocatalyst. The results are shown in FIG. 3.
As can be seen from FIG. 3, the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst prepared in the example almost completely degrades dibutyl phthalate after 120min of photocatalytic reaction in sewage treatment. In contrast, by comparing with the bismuth sulfide-bismuth tungstate composite prepared in comparative example 1, the bismuth sulfide prepared in comparative example 2, and the bismuth tungstate prepared in comparative example 3, it can be seen that: the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst prepared in the embodiment completely degrades dibutyl phthalate at first, and shows excellent photocatalytic performance.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A preparation method of a bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst is characterized by comprising the following steps:
(1) respectively dissolving bismuth nitrate and sodium tungstate in ethylene glycol to obtain a solution A and a solution B, and dissolving thiourea in ethanol to obtain a solution C; sequentially adding the solution B and the solution C into the solution A, and uniformly stirring to obtain a precursor solution;
(2) and carrying out solvothermal reaction on the precursor solution, washing and drying the black precipitate obtained by the reaction to obtain the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst.
2. The preparation method according to claim 1, wherein in the step (1), the bismuth nitrate is dissolved in ethylene glycol by ultrasonic dissolution to obtain a solution A; dissolving the sodium tungstate in ethylene glycol through ultrasonic dissolution to obtain a solution B; dissolving the thiourea in ethanol by ultrasonic dissolution to obtain a solution C; the ultrasonic dissolving time is 10-30 min.
3. The preparation method according to claim 1, wherein in the step (1), the concentration of bismuth nitrate in the solution A is 0.1-3M; the concentration of sodium tungstate in the solution B is 0.01-1M; the concentration of thiourea in the solution C is 0.005-2M.
4. The method according to claim 1, wherein the stirring time in step (1) is 10 to 60 min.
5. The preparation method according to claim 1, wherein in the step (1), the molar ratio of bismuth nitrate to sodium tungstate to thiourea in the precursor solution is 2.1:1, (0.3-3).
6. The preparation method according to claim 1, wherein in the step (2), the temperature of the solvothermal reaction is 140-220 ℃ and the time is 3-24 h.
7. The preparation method according to claim 1, wherein in the step (2), the drying temperature is 60-90 ℃ and the drying time is 8-24 h.
8. The bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst prepared by the preparation method of any one of claims 1 to 7.
9. The use of the bismuth-bismuth sulfide-bismuth tungstate composite photocatalyst as claimed in claim 8 in photocatalytic degradation of plasticizers.
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Application publication date: 20220329 |