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Titanium dioxide/silver/silver bromide core-shell photocatalyst and preparation method thereof

A titanium dioxide, core-shell structure technology, applied in the field of photocatalysis, can solve the problems of long preparation period, complex process, single preparation method, etc., and achieve the effect of short preparation period, low reaction temperature and simple process

Inactive Publication Date: 2013-02-06
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
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  • 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 material; titanium dioxide and silver bromide The preparation method of silver / silver bromide compound semiconductor is single, and silver bromide is deposited on the titanium dioxide material by deposition-precipitation method basically, and the silver bromide in the compound semiconductor that this method obtains has irregular morphology on the one hand, on the other hand its There are still problems such as photocorrosion and grain coarsening, and a low-temperature, rapid preparation method for titanium dioxide / silver / silver bromide photocatalyst with regular morphology and uniform core-shell structure is proposed

Method used

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  • Titanium dioxide/silver/silver bromide core-shell photocatalyst and preparation method thereof
  • Titanium dioxide/silver/silver bromide core-shell photocatalyst and preparation method thereof
  • Titanium dioxide/silver/silver bromide core-shell photocatalyst and preparation method thereof

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Effect test

Embodiment 1

[0022] Under vigorous stirring, use a peristaltic pump to inject silver nitrate solution and potassium bromide solution into the reaction pot containing gelatin and potassium bromide aqueous solution at the same time, control the temperature of the reaction pot at 85 °C, and control the injection of silver nitrate and potassium bromide solution Speed, so that the pBr value of the whole reaction process is constant at 3.8. After the injection of the silver nitrate solution and the potassium bromide solution, physical maturation was carried out at this temperature for 30 minutes. Weigh a certain amount of silver bromide glue, add titanium sulfate (according to the thickness of the titanium dioxide coating layer is 0.06μm), gradually increase the temperature from 30°C to 80°C to promote the hydrolysis of titanium sulfate, and the hydrothermal temperature is 120°C. The prepared titanium dioxide / silver bromide composite semiconductor was centrifuged and washed 6 times with warm wat...

Embodiment 2

[0026] Under vigorous stirring, the silver nitrate solution and potassium bromide solution were simultaneously injected into the reaction pot containing polyvinylpyrrolidone K30 and potassium bromide aqueous solution with a peristaltic pump, and the temperature of the reaction pot was controlled at 85°C. The injection speed of the solution made the pBr value of the whole reaction process constant at 3.8. After the injection of the silver nitrate solution and the potassium bromide solution, physical maturation was carried out at this temperature for 30 minutes. Weigh a certain amount of silver bromide glue, add titanium sulfate (according to the thickness of the titanium dioxide coating layer is 0.06μm), gradually increase the temperature from 30°C to 80°C to promote the hydrolysis of titanium sulfate, and the hydrothermal temperature is 120°C. The prepared titanium dioxide / silver bromide composite semiconductor was centrifuged and washed 6 times with warm water at 45°C to remo...

Embodiment 3

[0028] Under vigorous stirring, use a peristaltic pump to inject silver nitrate solution and potassium bromide solution into the reaction pot containing gelatin and potassium bromide aqueous solution at the same time, control the temperature of the reaction pot at 60 °C, and control the injection of silver nitrate and potassium bromide solution Speed, so that the pBr value of the whole reaction process is constant at 3.8. After the injection of the silver nitrate solution and the potassium bromide solution, physical maturation was carried out at this temperature for 30 minutes. Weigh a certain amount of silver bromide glue, add titanium sulfate (according to the thickness of the titanium dioxide coating layer is 0.06μm), gradually increase the temperature from 30°C to 80°C to promote the hydrolysis of titanium sulfate, and the hydrothermal temperature is 120°C. The prepared titanium dioxide / silver bromide composite semiconductor was centrifuged and washed 6 times with warm wat...

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Abstract

The invention relates to titanium dioxide / silver / silver bromide core-shell photocatalyst and a preparation method thereof. A core of the catalyst consists of homogeneous cubic silver bromide and nano-sliver formed in situ on the surface of the homogeneous cubic silver bromide, and a shell of the catalyst consists of titanium dioxide coating. The preparation method includes the steps of firstly, preparing cubic silver bromide microcrystalline by double-column precipitation in the presence of polymeric protector; coating titanium dioxide to the surface of silver bromide by hydrothermal process in the presence of polymeric protector; thirdly, subjecting the prepared titanium dioxide / silver bromide to photo-reduction by ultraviolet lamps to obtain the titanium dioxide / silver / silver bromide core-shell photocatalyst. Compared with the prior art, the titanium dioxide / silver / silver bromide core-shell photocatalyst has the advantages that the preparation process is simple, the catalyst is morphologically controllable, and agglomeration and photo-corrosion of the silver bromide are avoided effectively. The prepared catalyst absorbs visible light to efficiently degrade organic pollutants such as dye by resonance effect of ions of silver bromide, nano-sliver and the like.

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, the problems of global environmental pollution and energy crisis have become increasingly prominent, which have seriously threatened the survival and development of human beings, and have become the bottleneck restricting the sustainable development of countries all over the world. How to solve the increasingly serious environmental pollution and energy shortage problems 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 (titanium dioxide) electrodes, semiconductor photocatalysi...

Claims

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Application Information

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IPC IPC(8): B01J27/135B01J35/00C02F1/30
Inventor 田宝柱董荣芳李艺茹张金龙王婷婷杨钒熊天庆陈星
Owner EAST CHINA UNIV OF SCI & TECH
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