Flake silver @ silver iodate visible light photocatalyst and preparation method thereof

A silver iodate and photocatalyst technology, applied in the field of photocatalytic materials, can solve the problems of poor visible light absorption, high carrier recombination rate, easy photocorrosion, etc., and achieves improved photocatalytic performance, improved electron mobility, combined with solid effect

Active Publication Date: 2014-06-04
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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 Flake silver silver iodate visible light photocatalyst with plasmonic effect, and provides a simple and easy method for preparing the material

Method used

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  • Flake silver @ silver iodate visible light photocatalyst and preparation method thereof
  • Flake silver @ silver iodate visible light photocatalyst and preparation method thereof
  • Flake silver @ silver iodate visible light photocatalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] Weigh 5.31g potassium iodate, dissolve in 40mL water, weigh 4.28g silver nitrate, dissolve in 40mL water, heat the two solutions to 40 o C. Then quickly add the silver nitrate solution to the potassium iodate solution under stirring to obtain a white suspension, and continue stirring for 30 minutes; dissolve 0.06g of glucose in 5 mL of water, and then add the glucose solution to the Silver iodate suspension, stirred for 30min, filtered, washed, 50 o C dried for 4h to obtain a blue-gray powder.

[0029] 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 iodate, because the diffraction peak of silver iodate is very strong and sharp, and because the amount of loaded Ag is relatively low, and Since the strongest diffraction peak of Ag coincides with the (061) crystal plane of silver iodate, there is no diffraction peak of Ag in the X-ray diffraction pattern. attached ...

Embodiment 2

[0031] Weigh 5.26g of potassium iodate and 4.22g of silver nitrate, dissolve them in 20 mL of water respectively, quickly add the potassium iodate solution into the silver nitrate solution at room temperature with stirring to obtain a white suspension, and stir for 50 minutes. Weigh 0.006g of potassium borohydride and dissolve it in 1mL of water, add the potassium borohydride solution while stirring to obtain a gray-green suspension, continue to stir at room temperature for 30min, filter and wash, 80o C dried for 2 h to obtain gray-green powder.

[0032] attached figure 2 (b) is the X-ray diffraction pattern of the sample obtained in this example. attached Figure 4 It is the SEM photograph of the product obtained in this embodiment. It can be seen that the sample has a sheet-like structure, and the edges of the sheet are loaded with Ag nanoparticles.

Embodiment 3

[0034] Weigh 5.31g of sodium iodate and 4.57g of silver nitrate, dissolve them in 30mL of water respectively, add the sodium iodate solution to the silver nitrate solution at room temperature with stirring, and heat the mixed solution to 50 o C, to obtain a white suspension, stir for 20min; dissolve 0.02g of ascorbic acid in 3mL of water, add it into the suspension of silver iodate while stirring, and turn it into a blue-gray suspension, filter and wash after stirring for 30min, and 60 o C dried for 3.6h to obtain a blue-gray powder.

[0035] attached Figure 5 It is the SEM photograph of the product obtained in this embodiment. It can be seen that the sample has a sheet-like structure, and the edges of the sheet are loaded with Ag nanoparticles.

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Abstract

The invention relates to a flake silver @ silver iodate visible light photocatalyst and a preparation method thereof. The preparation method comprises the following steps: respectively dissolving sodium iodate or potassium iodate and silver nitrate in water, adding one solution into another solution under the stirring condition so as to generate suspension of silver iodate; dripping hydrazine hydrate, sodium borohydride and other aqueous solutions containing reducing substances into the obtained suspension, irradiating the suspension under illumination of a xenon lamp of 300W for 5-30 minutes by adopting a photoreduction method, generating metal silver nanoparticles on the surfaces of silver iodate particles in situ, and finally, filtering the precipitate, washing and drying to obtain the flake silver @ silver iodate visible light photocatalyst. The method can be implemented at room temperature and under normal pressure, the cost is low, the equipment is simple and easy to operate, large-scale production can be realized, and the method has significant potential application in the aspect of industrial production. The prepared flake silver @ silver iodate photocatalytic material has high photocatalytic performance, the elemental silver and silver iodate generated due to in-situ reduction are firmly bound, and separation of photon-generated carriers is obviously improved.

Description

technical field [0001] The invention relates to a novel flaky silver iodate visible light photocatalyst and a preparation method thereof, belonging to the technical field of photocatalytic materials. [0002] Background technique [0003] In recent years, the purification treatment of organic pollutants and pathogenic microorganisms in sewage has become a concern of people. Traditional disinfection methods often consume large amounts of energy or produce toxic by-products. As an alternative method, the photocatalytic degradation of harmful and toxic pollutants by means of photocatalysis is gaining more and more attention. Photocatalytic technology, a technology that uses solar energy to degrade environmentally harmful pollutants, is an effective way to solve current environmental problems. Based on titanium dioxide (TiO 2 ) heterogeneous photocatalysis has the advantages of stable photochemical properties, high catalytic efficiency, non-toxic, harmless, cheap, and no sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06
Inventor 高善民陈玉静李延敏徐慧赵佰胜张一清付荣荣
Owner LUDONG UNIVERSITY
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