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Heterojunction nanosheet photocatalyst and preparation method and application of heterojunction nanosheet photocatalyst

A photocatalyst and heterojunction technology, applied in the field of photocatalytic materials, can solve the problems of low photon utilization efficiency, easy recombination of electrons and holes, and ineffective use of solar energy.

Inactive Publication Date: 2015-04-29
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, in the research of semiconductor photocatalysts, there are generally the following two limitations: i) the light energy utilization range is mainly concentrated in the ultraviolet region, and the solar light energy cannot be effectively used; ii) the electrons and holes generated by photoexcitation are easy to recombine , the light quantum utilization efficiency is low, therefore, it is necessary to find a photocatalytic material that responds to visible light and has superior degradation efficiency
[0004] At present, most of the patents on heterojunction materials used in photocatalysis are concentrated on the heterojunction composite with ultraviolet light-responsive oxides such as titanium dioxide and zinc oxide. Mass junction, used for photocatalytic degradation of dyes under visible light has not been reported yet

Method used

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Experimental program
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Embodiment 1

[0021] (1) Tungsten oxide: Dissolve 1 mmol, 1.5 mmol, and 3 mmol of sodium tungstate in 25 mL of deionized water, and then add 5 mL of concentrated nitric acid to obtain a mixed solution A; transfer the mixed solution A to polytetrafluoroethylene Among the stainless steel reaction kettles with vinyl fluoride liner, the preferred reaction kettle is the stainless steel reaction kettle with polytetrafluoroethylene liner. The reaction temperature is set at 180°C, and the reaction time is 3 h. After the reaction is completed, cool to room temperature. The cooling method is Natural cooling, or other common physical cooling methods, wash with deionized water and ethanol, and dry by vacuum drying or natural drying to obtain tungsten oxide powder. The morphology of tungsten oxide is in the form of nano flakes by taking SEM images. , and when the sodium tungstate is 1.5 mmol, the morphology is the most regular.

[0022] (2) Compounding of silver phosphate and tungsten oxide: Dissolve 1 ...

Embodiment example 2

[0024] (1) Tungsten oxide: Fully dissolve 1.5 mmol of sodium tungstate in 25 mL of deionized water, then add 5 mL of concentrated nitric acid to obtain a mixed solution A; transfer the mixed solution A to the stainless steel reaction of the polytetrafluoroethylene liner In the kettle, the preferred reaction kettle is a stainless steel reaction kettle with a polytetrafluoroethylene liner. The reaction temperature is set to 180°C, and the reaction time is set to 1 h, 3 h, and 6 h respectively. After the reaction is completed, cool to room temperature and The method is natural cooling, or other common physical cooling methods, washed with deionized water and ethanol, and dried by vacuum drying or natural drying to obtain tungsten oxide powder; the morphology of tungsten oxide is investigated by taking SEM images. The morphology of tungsten oxide is the most regular when the reaction time is 3 h.

[0025] (2) Compounding of silver phosphate and tungsten oxide: Dissolve 1 mmol of t...

Embodiment example 3

[0027] (1) Tungsten oxide: Fully dissolve 1.5 mmol of sodium tungstate in 25 mL of deionized water, then add 5 mL of concentrated nitric acid to obtain a mixed solution A; transfer the mixed solution A to the stainless steel reaction of the polytetrafluoroethylene liner In the kettle, the preferred reaction kettle is a stainless steel reaction kettle with a polytetrafluoroethylene liner. The reaction temperature is set at 160°C, 180°C, and 200°C respectively, and the reaction time is 3 h. After the reaction is completed, cool to room temperature. For natural cooling, or other common physical cooling methods, wash with deionized water and ethanol, dry by vacuum drying or natural drying to obtain tungsten oxide powder, wash the obtained precipitate with deionized water and ethanol, and vacuum After drying by drying or natural drying, tungsten oxide powder is obtained; the morphology of tungsten oxide is examined by taking SEM images, and the tungsten oxide is in the shape of nano...

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Abstract

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a heterojunction nanosheet photocatalyst and a preparation method and application of the heterojunction nanosheet photocatalyst. A visible light responsive heterojunction photocatalytic material is prepared from silver nitrate, disodium hydrogen phosphate, nitric acid, ammonia water, and sodium tungstate as raw materials by utilizing a hydrothermal method and a precipitation method. The photocatalyst is made from a silver phosphate / tungsten oxide heterojunction photocatalytic material formed by tungsten oxide and silver phosphate, tungsten oxide is in a nanosheet shape, silver phosphate is in a particle shape, the silver phosphate nano-particles uniformly grow on the surfaces of the tungsten oxide nanosheets, and the molar ratio of tungsten oxide to silver phosphate is 1 to (0.3-1.8). The visible light responsive heterojunction photocatalytic material prepared by the method is used for degrading a methylene blue trihydrate dye, and the degradation rate can reach 97% after the degradation is carried out for 20 minutes.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to a heterojunction nanosheet photocatalyst and its preparation method and application. Background technique [0002] Dyes are a class of key chemicals widely used in the development of the dye industry and the printing and dyeing industry. However, the dyes cannot be fully utilized during the use process, and a large amount of residual parts enter the environment, causing potential harm to the ecological environment and human health. Therefore, how to eliminate the dye molecules in the water environment has become an urgent problem to be solved; the degradation of dye molecules can be achieved by traditional techniques such as chemical flocculation and biodegradation. Among these technologies, semiconductor-based photocatalysis has become a research hotspot. Photocatalysis can convert solar energy into chemical energy and electrical energy, thereby achieving green ...

Claims

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Application Information

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IPC IPC(8): B01J27/188B01J35/02A62D3/17A62D101/28
Inventor 施伟东王超蔡凡朋胡泊吴苗苗余小强张超
Owner JIANGSU UNIV
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