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Preparation method of silver oxide as ultraviolet/visible/infrared photocatalyst

A technology of photocatalytic oxidation and visible light, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of low catalyst recovery rate and low solar energy utilization rate , to achieve the effects of low recycling rate, simple preparation method and high catalytic efficiency

Inactive Publication Date: 2015-02-18
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most widely used photocatalyst is titanium dioxide, which is non-toxic, harmless, non-corrosive, reusable, and can completely mineralize organic pollutants into H 2 O and inorganic ions, no secondary pollution and other advantages, however, due to TiO 2 The photocatalyst has a wide band gap and can only absorb 4% to 6% of ultraviolet rays in sunlight. Most of the visible light and infrared light in sunlight cannot be absorbed by titanium dioxide catalysts, and the solar energy utilization rate is low; in addition, nanoscale TiO 2 Factors such as easy agglomeration, low catalyst recovery, and recombination of photogenerated carriers also limit TiO 2 Applications

Method used

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  • Preparation method of silver oxide as ultraviolet/visible/infrared photocatalyst
  • Preparation method of silver oxide as ultraviolet/visible/infrared photocatalyst
  • Preparation method of silver oxide as ultraviolet/visible/infrared photocatalyst

Examples

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Effect test

Embodiment 1

[0029] Weigh a certain amount of silver acetate, silicic acid, and cesium hydroxide solid, and then dissolve them in deionized water to prepare 0.05-2mol / L silver acetate solution, 0.02-1mol / L silicic acid solution and 0.03-3mol / L L cesium hydroxide solution, first silicic acid solution and cesium hydroxide solution are mixed, then under the condition of magnetic stirring, described mixed liquid is added dropwise in the described silver acetate solution, obtains precipitation, after dropwise addition, Continue magnetic stirring for 2.5 h at room temperature under the condition of avoiding light, filter, wash the precipitate with deionized water, and dry at 50° C. to obtain a silver oxide photocatalyst with infrared / visible / ultraviolet photocatalytic effect.

Embodiment 2

[0031] After mixing the silicic acid solution and the cesium hydroxide solution in the above embodiment 1, it can be directly mixed with silver acetate, then placed in a hydrothermal kettle, heated at 60-220°C for 1-72h after tightening, and the water is taken out Heat the kettle, cool to normal temperature to obtain precipitate, then filter, wash, and dry at 50°C to obtain a silver oxide photocatalyst with infrared light / visible light / ultraviolet photocatalytic effect.

Embodiment 3

[0033] Change the silver acetate in the above embodiment 1 and embodiment 2 to silver fluoride or silver nitrate, still can get precipitation, after filtering, washing, drying at 50 ℃, get the photocatalytic effect of infrared light / visible light / ultraviolet light silver oxide photocatalyst.

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Abstract

The invention provides a preparation method of a photocatalyst capable of realizing photo-catalytic oxidation and reduction under irradiation of ultraviolet light, visible light and infrared light. Soluble silver salt, strong base and weak acid or soluble silver salt and strong alkali and weak acid salt adopt an ion exchange coprecipitation method or a hydrothermal method to prepare silver oxide precipitate, and the silver oxide precipitate is washed and dried to obtain the photocatalyst. The photocatalyst preparation method is simple, has good photocatalysis performance under irradiation of infrared light / visible light / ultraviolet light, is high in light degradation rate and stability and has a practical value and application prospect.

Description

technical field [0001] The invention relates to a preparation method of a photocatalyst, and more specifically relates to a silver oxide photocatalyst capable of performing photocatalytic oxidation-reduction reactions under the irradiation of infrared light, visible light and ultraviolet light. technical background [0002] Photocatalytic technology is a green technology with important application prospects in the fields of energy and the environment. It has the advantages of mild reaction conditions, no secondary pollution, and direct use of sunlight for oxidation-reduction reactions. In the photocatalytic process, the semiconductor material generates photogenerated electrons and holes under the irradiation of light. The electrons are reductive, and the holes are oxidative. By converting light energy into chemical energy, the synthesis of compounds (organic and inorganic) is promoted. Synthesis or decomposition. [0003] At present, the most widely used photocatalyst is ti...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J35/02C01G5/00
Inventor 蒋炜吴兆美梁斌
Owner SICHUAN UNIV
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