Bismuth tungstate nanocomposite, and preparation method and application thereof

A nanocomposite material, bismuth tungstate technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low photoelectric conversion efficiency and catalytic performance, to improve photocatalytic performance, The effect of strong photocatalytic performance and good photoelectrochemical properties

Inactive Publication Date: 2015-10-14
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the ultra-high carrier efficiency of semiconductors, their photoelectric conversion efficiency and catalytic performance are very low.

Method used

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  • Bismuth tungstate nanocomposite, and preparation method and application thereof
  • Bismuth tungstate nanocomposite, and preparation method and application thereof
  • Bismuth tungstate nanocomposite, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of bismuth tungstate nanocomposite material of the present invention is as follows:

[0035] （1） Weigh 0.4mM Na 2 WO 6 2H 2 O and 2.2mM sodium oleate were dissolved in 20mL double-distilled water respectively, and then ultrasonically dissolved to form a transparent liquid marked as A liquid; weigh 0.4mM Bi(NO 3 ) 3 ·5H 2 O, add 10mL of dispersed graphene oxide (GO) with a mass concentration of 1mg / mL, and add 10ml of twice distilled water for ultrasonication to form a brown uniform liquid marked as B liquid, then mix A and B for 3 hours . where Na 2 WO 6 2H 2 O is the tungsten source, Bi(NO 3 ) 3 ·5H 2O is a bismuth source. Then the above mixed liquid was transferred to a sealed autoclave, put the autoclave into an oven, control the reaction temperature to 160°C, and after 18 hours of hydrothermal reaction, take out the autoclave and cool for 30 minutes. A black precipitate was obtained by filtration with a 45 μm mixed cellulose memb...

Embodiment 2

[0039] Embodiment 2 Performance test of the bismuth tungstate nanocomposite material of the present invention

[0040] The rGO / Bi prepared in Example 1 2 WO 6 / Ag nanocomposite material was dried at 60° C. for 6 h, and after drying, 5 mg of the composite material was weighed and dispersed in 10 mL of absolute ethanol. Finally, use a dropper to draw a certain amount of composite material and drop-coat it on the surface of ITO conductive glass, and dry it in an oven at 60°C. Then it was put into a tube furnace and raised to 300°C with a heating rate of 1°C / min, and kept at 300°C for 1.5 hours.

[0041] 1. After taking out the conductive glass, put it in the self-made electrolytic cell, and then make the current-time curve on the CHI900 scanning electrochemical microscope, the electrolyte used is 0.25mol / LNa 2 S and 0.35mol / LNa 2 SO 3 , the bias voltage used is 0.1V, and the time of optical switching is 10 seconds. A three-electrode system is adopted, the working electrod...

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Abstract

The invention provides a preparation method of bismuth tungstate nanocomposite. The method is as follows: (1) dissolving Na2WO6.2H2O and sodium oleate in redistilled water, and conducting ultrasound treatment to form a clear liquid; mixing the Bi(NO3)3.5H2O, 1mg / mL graphene oxide and redistilled water, and conducting ultrasound treatment to form a brown uniform liquid; mixing and stirring evenly the two solutions, conducting a hydrothermal reaction, cooling, filtering to obtain a precipitate, washing and drying the precipitate to obtain black rGO / Bi2WO6 nanocomposite; and (2) dispersing the rGO / Bi2WO6 nanocomposite into absolute ethyl alcohol, dissolving silver nitrate in ethylene glycol, mixing the two, and irradiating under xenon lamp to obtain a silver loaded rGO / Bi2WO6 / Ag nanocomposite. The bismuth tungstate nanocomposite provided by the invention has good photosensitization, and has great significance in photocatalytic degradation of organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of preparation of loaded semiconductor materials, and in particular relates to a bismuth tungstate nanocomposite material. Background technique [0002] With the rapid development of society and economy, energy crisis and environmental degradation have become global problems that need to be solved urgently. How to develop efficient, environmentally friendly, and low-cost energy has become urgent. As an ideal, efficient, and renewable energy source, solar energy has attracted the attention of more researchers, so scientists have devoted a lot of work to the preparation and application of photosensitized materials. Bismuth tungstate is an excellent photosensitizing material, which has been widely used in industrial production due to its narrow band, stability and low price. However, due to the ultra-high carrier efficiency of semiconductors, their photoelectric conversion efficiency and catalytic performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B82Y30/00B82Y40/00A62D3/17A62D101/20
Inventor 卢小泉宁星铭李文奇蒋媛李毅然马巧玲胡一平何笑光志强
Owner NORTHWEST NORMAL UNIVERSITY
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