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Silver-loaded silver bromate visible-light-induced photocatalyst and preparation method thereof

A photocatalyst, silver bromate technology, applied in the field of photocatalytic materials, can solve the problems of high carrier recombination rate, poor visible light absorption, easy photocorrosion, etc., to improve electron mobility, improve photocatalytic performance, reduce centrifugal force effect of operation

Active Publication Date: 2014-05-28
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems of poor absorption of visible light and high carrier recombination rate of traditional photocatalysts, and the problem of easy photocorrosion and instability of silver / silver halide (AgX, X=Cl, Br, I) system, and provides a Silver-loaded silver bromate visible light photocatalyst, while providing a simple and easy method for preparing the material, which is low in cost and easy to scale up

Method used

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  • Silver-loaded silver bromate visible-light-induced photocatalyst and preparation method thereof
  • Silver-loaded silver bromate visible-light-induced photocatalyst and preparation method thereof
  • Silver-loaded silver bromate visible-light-induced photocatalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] Weigh 5.02g of potassium bromate, dissolve it in 60mL of water, weigh 5.42g of silver nitrate, dissolve it in 60mL of water, add the silver nitrate solution into the potassium bromate solution at room temperature and under stirring, and continue stirring for 30min to obtain a white suspension; then warm up to 40 o C. Add 0.08g of glucose dissolved in 8mL of water to the suspension of silver bromate under stirring, stir for 1h, filter, wash, 50 o C dried for 4h to obtain a gray powder.

[0026] attached figure 2 (a) is the X-ray diffraction pattern of the sample obtained in this example. It can be seen from the figure that the product is silver bromate. Since the diffraction peak of silver bromate is very strong and sharp, and because the amount of Ag loaded is relatively low, so The diffraction peak of Ag in the X-ray diffraction pattern is very weak. attached image 3 It is a TEM photo of the product obtained in this example. It can be seen from the figure that ...

Embodiment 2

[0028] Weigh 2.83g potassium bromate, dissolve it in 20mL water, weigh 2.93g silver nitrate, dissolve it in 20mL water, heat the potassium bromate solution to 40 o C, then silver nitrate solution was added, and the reaction was stirred for 1 h to obtain a white suspension. Weigh 0.007g of potassium borohydride, dissolve it in 2mL of water, add the potassium borohydride solution under the condition of stirring to obtain a gray suspension, and continue at 40 o Stir at C for 30min, filter, wash, 80 o C dried for 2 h to obtain a dark gray powder.

[0029] attached figure 2 (b) is the X-ray diffraction pattern of the sample obtained in this example. It can be seen from the figure that the product is silver bromate. Since the diffraction peak of silver bromate is very strong and sharp, and because the amount of Ag loaded is relatively low, so The diffraction peak of Ag in the X-ray diffraction pattern is very weak. attached Figure 4 It is a TEM photo of the product obtained i...

Embodiment 3

[0031] Weigh 6.04g of sodium bromate, dissolve it in 40mL of water, weigh 7.2g of silver nitrate, dissolve it in 30mL of water, add the sodium bromate solution to the solution of silver nitrate under stirring, and heat the mixed solution to 50 oC. Stir for 40min to obtain a white suspension; dissolve 0.08g of ascorbic acid in 5mL of water, add it into the suspension of silver bromate while stirring, and turn it into a gray suspension, filter and wash after stirring for 30min, and wash at 60 o C dried for 3.6h to obtain a dark gray powder.

[0032] attached Figure 5 It is a TEM photo of the product obtained in this example. It can be seen from the figure that the prepared samples are particles with a particle size between 250 and 600 nanometers, and the surface is covered with small particles with an average particle size of about 50 nanometers, which are Ag particles obtained by in situ reduction.

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Abstract

The invention relates to a silver-loaded silver bromate visible-light-induced photocatalyst and a preparation method thereof. The particles of the silver-loaded silver bromate visible-light-induced photocatalyst are 200-1,500 nm in diameter, are sphere-like particles, and are loaded in situ with silver particles with the size of 10-100 nm on the surfaces. The preparation method comprises the following steps: dissolving sodium bromate or potassium bromate, and silver nitrate in water respectively; under the condition of stirring, adding one solution to the other solution to generate silver bromate suspension; dripping the aqueous solutions of reducing substances such as hydrazine hydrate and sodium borohydride, into the obtained silver bromate suspension, or adopting a photoreduction method to generate silver nanoparticles in situ on the surfaces of the silver bromate particles; finally, precipitating, filtering, washing and drying to obtain the silver-loaded silver bromate visible-light-induced photocatalyst. According to the invention, the material provided by the invention has very good photocatalytic performance; the elementary substance, silver generated in situ and the silver bromate are firmly combined; the preparation method is simple; the low cost is low; the reaction conditions are mild; the yield is high; requirements equipment are low; the silver bromate visible-light-induced photocatalyst is suitable for industrial production.

Description

technical field [0001] The invention relates to a novel silver-loaded silver bromate visible light photocatalyst and a preparation method thereof, belonging to the technical field of photocatalytic materials. [0002] Background technique [0003] In recent years, with the improvement of living standards, people are aware of the importance of environmental protection, and the purification of organic pollutants and pathogenic microorganisms in sewage has become a concern of people. Photocatalytic degradation of harmful and toxic pollutants by means of photocatalysis has been increasingly favored by people. Titanium dioxide (TiO 2 ) has the advantages of stable photochemical properties, high catalytic efficiency, non-toxic, harmless, cheap, and no secondary pollution, and has attracted the attention of researchers at home and abroad. However, TiO 2 The wide bandgap and low quantum efficiency are two bottlenecks restricting its practical application. In order to make full u...

Claims

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Application Information

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IPC IPC(8): B01J27/06
Inventor 高善民陈玉静李延敏徐慧张一清赵佰胜付荣荣
Owner LUDONG UNIVERSITY
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