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Nano silver/cube silver chloride photo-catalytic material and preparation method

A catalytic material and cube technology, applied in the field of photocatalysis, can solve the problems of long preparation period, complex process, high temperature required for the reaction process, etc., and achieve the effects of short preparation period, low reaction temperature and simple process

Inactive Publication Date: 2012-03-21
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the defects of complex process, long preparation period, high temperature required in the reaction process, irregular shape and poor uniformity of the obtained silver / silver chloride photocatalytic material in the current preparation method of silver / silver chloride photocatalyst, and proposes a low-temperature, Method for rapid preparation of silver / cubic silver chloride photocatalytic material

Method used

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  • Nano silver/cube silver chloride photo-catalytic material and preparation method
  • Nano silver/cube silver chloride photo-catalytic material and preparation method
  • Nano silver/cube silver chloride photo-catalytic material and preparation method

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Effect test

Embodiment 1

[0022] Under vigorous stirring, use a peristaltic pump to inject silver nitrate solution and sodium chloride solution into the reaction pot containing gelatin and sodium chloride aqueous solution at the same time, control the temperature of the reaction pot at 80°C, and control the injection of silver nitrate and sodium chloride solution Speed, so that the pCl value of the whole reaction process is constant at 1.4. After the injection of the silver nitrate solution and the sodium chloride solution, physical maturation was carried out at this temperature for 30 minutes. The prepared silver chloride microcrystals were centrifuged and washed 6 times with warm water at 45°C to remove the gelatin protective agent, excess sodium chloride and sodium nitrate produced by the reaction. Silver chloride microcrystals were dispersed in aqueous solution, methanol was added as a hole-scavenging agent, and a 300W high-pressure mercury lamp was used to perform photoreduction treatment on the s...

Embodiment 2

[0026] Under vigorous stirring, use a peristaltic pump to inject silver nitrate solution and sodium chloride solution into the reaction pot containing polyvinylpyrrolidone K30 and sodium chloride aqueous solution at the same time. The injection speed of the solution was such that the pCl value throughout the reaction process was constant at 1.4. After the injection of the silver nitrate solution and the sodium chloride solution, physical maturation was carried out at this temperature for 30 minutes. The prepared silver chloride microcrystals were centrifuged and washed 6 times with warm water at 45°C to remove the gelatin protective agent, excess sodium chloride and sodium nitrate produced by the reaction. Silver chloride microcrystals were dispersed in aqueous solution, methanol was added as a hole-scavenging agent, and a 300W high-pressure mercury lamp was used to perform photoreduction treatment on the silver chloride microcrystals for 2 hours to form silver nanoparticles o...

Embodiment 3

[0028] Under vigorous stirring, use a peristaltic pump to inject silver nitrate solution and sodium chloride solution into the reaction pot containing gelatin and sodium chloride aqueous solution at the same time, control the temperature of the reaction pot at 70 °C, and control the injection of silver nitrate and sodium chloride solution Speed, so that the pCl value of the whole reaction process is constant at 1.4. After the injection of the silver nitrate solution and the sodium chloride solution, physical maturation was carried out at this temperature for 30 minutes. The prepared silver chloride microcrystals were centrifuged and washed 6 times with warm water at 45°C to remove the gelatin protective agent, excess sodium chloride and sodium nitrate produced by the reaction. Silver chloride microcrystals were dispersed in aqueous solution, methanol was added as a hole-scavenging agent, and a 300W high-pressure mercury lamp was used to perform photoreduction treatment on the ...

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Abstract

The invention relates to a nano silver / cube silver chloride photo-catalytic material and a preparation method. The photo-catalytic material comprises uniform cube silver chloride crystallites and the nano silver which is formed on the surface of the crystallite on the same position, and the weight of the nano silver particles is 5-30% of the total weight of the catalyst. The preparation method of the photo-catalytic material comprises the following steps: (1) adopting a double-column precipitation method to control the pCI value during the reaction process under the existence of polymeric protector, and preparing the cube silver chloride crystallites; (2) washing through warm water to remove the polymeric protector and inorganic salt; (3) adopting an ultraviolet lamp to photo-reduce the prepared silver chloride crystallites so as to obtain the nano silver / cube silver chloride photo-catalytic material. Compared with the prior art, the invention has simple preparation process, does not need high temperature, and can control the appearance of the catalyst. The catalyst prepared by the invention can absorb the visible light through the plasma resonance effect of the nano silver particles, and can effectively degrade organic pollutant, for example, dye.

Description

technical field [0001] The invention relates to a photocatalytic material applicable to degradation of pollutants in water and hydrogen production by photolysis of water and a preparation method thereof, belonging to the technical field of photocatalysis. Background technique [0002] In the 21st century, global environmental pollution and energy crisis have become more prominent, which has seriously threatened the survival and development of human beings, and has become a bottleneck restricting the sustainable development of countries all over the world. How to degrade the increasingly serious environmental pollution and energy pollution has become the top priority of the governments of all countries and needs to be solved urgently. [0003] Since Fujishima and Honda discovered in the 1970s that hydrogen can be produced by photolysis of water on n-type semiconductor titanium dioxide electrodes, semiconductor photocatalysis technology has attracted extensive attention from r...

Claims

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Application Information

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IPC IPC(8): B01J27/10B01J23/50C01B3/04C02F1/32B01D53/86
CPCY02E60/36
Inventor 田宝柱包沈源董荣芳曾翠云王婷婷张金龙李套云廉志鹏
Owner EAST CHINA UNIV OF SCI & TECH
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