Preparation method for cadmium selenide-bismuth tungstate compound photocatalyst

A technology of bismuth tungstate and cadmium selenide, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of cadmium selenide's easy photocorrosion, poor photostability, and low solar utilization rate, etc. problem, to achieve the effect of good catalytic activity and high stability

Inactive Publication Date: 2017-12-29
张家港市金港镇宏业海绵复合厂
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  • Description
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  • Application Information

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Problems solved by technology

[0003] Cadmium selenide is easily corroded by light, has poor photostability, the light absorption threshold of titanium dioxide is limited to ultraviolet light, and the solar utilization rate is low. These shortcomings greatly limit their performance.

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0017] Preparation method of cadmium selenide-bismuth tungstate composite photocatalyst

[0018] (1), preparation of bismuth tungstate

[0019] First add bismuth nitrate to the nitric acid solution with a concentration of 4mol / L and stir for at least 30 minutes according to the mass ratio between bismuth nitrate and nitric acid of 5:1 to obtain a bismuth nitrate solution, and then mix according to the ratio between sodium tungstate and deionized water. The mass ratio of sodium tungstate is 50:1. Add sodium tungstate to deionized water and stir evenly to obtain sodium tungstate solution. Then, first add polyvinylpyrrolidone to sodium tungstate solution and stir evenly to obtain a mixed solution. Among them, the mixed solution The mass ratio between sodium tungstate and polyvinylpyrrolidone in the solution is 1.8:1, and then the bismuth nitrate solution is added to the mixed solution to obtain a precursor solution, wherein the ratio between bismuth nitrate and sodium tungstate i...

Embodiment 2

[0024] Preparation method of cadmium selenide-bismuth tungstate composite photocatalyst

[0025] (1), preparation of bismuth tungstate

[0026] First add bismuth nitrate into the nitric acid solution with a concentration of 2mol / L and stir for at least 30 minutes according to the mass ratio between bismuth nitrate and nitric acid of 4:1 to obtain a bismuth nitrate solution, and then according to the ratio between sodium tungstate and deionized water The mass ratio of sodium tungstate is 50:1. Add sodium tungstate to deionized water and stir evenly to obtain sodium tungstate solution. Then, first add polyvinylpyrrolidone to sodium tungstate solution and stir evenly to obtain a mixed solution. Among them, the mixed solution The mass ratio between sodium tungstate and polyvinylpyrrolidone in the solution is 2:1, and then the bismuth nitrate solution is added to the mixed solution to obtain a precursor solution, wherein the ratio between bismuth nitrate and sodium tungstate in the...

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Abstract

The invention discloses a preparation method for a cadmium selenide-bismuth tungstate compound photocatalyst. The method comprises the following steps: (1) dissolving cadmium hydrate and 3-thiohydracrylic acid at mole ratio of 1:(1.5-1.7) into deionized water, thereby forming a mixed solution; regulating pH of the solution to 7-8; adding a selenium hydride precursor into the mixed solution and reacting for 30-35 minutes at 160-170 DEG C, thereby acquiring a cadmium selenide quantum dot; (2) dissolving the cadmium selenide quantum dot and bismuth tungstate into the deionized water, refluxing for 20-25 hours at 80-90 DEG C and centrifugally drying, thereby acquiring the cadmium selenide-bismuth tungstate compound photocatalyst. The cadmium selenide-bismuth tungstate compound photocatalyst acquired according to the invention has high catalytic activity and high stability.

Description

technical field [0001] The application belongs to the technical field of wastewater treatment, and in particular relates to a preparation method of a cadmium selenide-bismuth tungstate composite photocatalyst. Background technique [0002] Cadmium selenide is a direct bandgap semiconductor material with a bandgap width of 1.7eV. It has two crystal structures of cubic sphalerite and hexagonal wurtzite. The cubic phase structure is metastable and can only exist at low temperature and high temperature. transforms into a hexagonal phase structure. Cadmium selenide can exist both cubic and hexagonal crystal phases at room temperature. Cadmium selenide nanocrystals are the most widely studied and most promising type of II-VI semiconductor nanocrystals among semiconductor nanocrystals. attention. As a very important semiconductor material, it has shown broad application prospects in various light-emitting devices, laser and infrared detection devices, infrared windows and nonlin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057
Inventor 沙冰娟
Owner 张家港市金港镇宏业海绵复合厂
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