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Nano silver/cubic silver bromide photocatalysis material and preparation method thereof

A photocatalytic material, silver bromide technology, applied in the field of photocatalysis, can solve the problems of complex process, long preparation cycle, high temperature in the reaction process, etc., and achieve the effect of simple process, short preparation cycle and low reaction temperature

Inactive Publication Date: 2012-04-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 bromide photocatalytic material in the current preparation method of silver / silver bromide photocatalyst, and proposes a low temperature, Method for rapid preparation of silver / cubic silver bromide photocatalytic material

Method used

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  • Nano silver/cubic silver bromide photocatalysis material and preparation method thereof
  • Nano silver/cubic silver bromide photocatalysis material and preparation method thereof
  • Nano silver/cubic silver bromide photocatalysis material and preparation method thereof

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Embodiment 1

[0022] Under vigorous stirring, use a peristaltic pump to inject silver nitrate solution and potassium bromide solution into the reaction bath containing gelatin and potassium bromide aqueous solution at the same time, control the temperature of the reaction bath at 80 °C, and control the injection of silver nitrate and potassium bromide Speed, so that the pBr value of the whole reaction process is constant at 4.0. After the injection of the silver nitrate solution and the potassium bromide solution, physical maturation was carried out at this temperature for 30 minutes. The prepared silver bromide microcrystals were centrifuged and washed 6 times with warm water at 45°C to remove the gelatin protective agent, excess potassium bromide and potassium nitrate produced by the reaction. Silver bromide microcrystals were dispersed in aqueous solution, methanol was added as a hole trapping agent, and a 300W high-pressure mercury lamp was used to perform photoreduction treatment on th...

Embodiment 2

[0026] Under vigorous stirring, the silver nitrate solution and potassium bromide solution were simultaneously injected into the reaction bath containing polyvinylpyrrolidone K30 and potassium bromide aqueous solution with a peristaltic pump, and the temperature of the reaction bath was controlled at 80°C. The injection speed of the solution was such that the pBr value was constant at 4.0 throughout the reaction process. After the injection of the silver nitrate solution and the potassium bromide solution, physical maturation was carried out at this temperature for 30 minutes. The prepared silver bromide microcrystals were centrifuged and washed 6 times with warm water at 45°C to remove the gelatin protective agent, excess potassium bromide and potassium nitrate produced by the reaction. Silver bromide microcrystals were dispersed in aqueous solution, methanol was added as a hole trapping agent, and a 300W high-pressure mercury lamp was used to perform photoreduction treatment...

Embodiment 3

[0028] Under vigorous stirring, use a peristaltic pump to inject silver nitrate solution and potassium bromide solution into the reaction bath containing gelatin and potassium bromide aqueous solution at the same time, control the temperature of the reaction bath at 70 °C, and control the injection of silver nitrate and potassium bromide Speed, so that the pBr value of the whole reaction process is constant at 4.0. After the injection of the silver nitrate solution and the potassium bromide solution, physical maturation was carried out at this temperature for 30 minutes. The prepared silver bromide microcrystals were centrifuged and washed 6 times with warm water at 45°C to remove the gelatin protective agent, excess potassium bromide and potassium nitrate produced by the reaction. Silver bromide microcrystals were dispersed in aqueous solution, methanol was added as a hole trapping agent, and a 300W high-pressure mercury lamp was used to perform photoreduction treatment on th...

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Abstract

The invention relates to a nano silver / cubic silver bromide photocatalysis material and a preparation method thereof. The photocatalysis material is formed by homogeneous cubic silver bromide microcrystals and nano silver formed on the surfaces of the microcrystals in situ, wherein the nano silver particles account for 3-25% of the total catalyst by weight. The preparation method comprises the following steps of: (1) in the presence of a polymer protectant, adopting a double jet-precipitation method and controlling the pBr value of the reaction process to prepare the cubic silver bromide microcrystals; (2) removing the polymer protectant and inorganic salts by washing the cubic silver bromide microcrystals with warm water; and (3) using an ultraviolet lamp to carry out photoreduction treatment on the prepared silver bromide microcrystals, thus obtaining the nano silver / cubic silver bromide photocatalysis material. Compared with the prior art, the preparation method has the advantages of simple preparation process, high temperature dispensability and catalyst morphology controllability. The prepared catalyst can absorb visible light through the silver nanoparticle plasmon resonance effect and efficiently degrade such organic pollutants as dyes.

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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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/08B82Y30/00C02F1/32C01B3/04C02F101/38
CPCY02E60/364Y02E60/36
Inventor 田宝柱曾翠云包沈源张金龙董荣芳王婷婷杨钒廉志鹏
Owner EAST CHINA UNIV OF SCI & TECH
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