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Preparation method of visible-light nano composite photocatalyst AgCl-SnO2

A nano-composite, photocatalyst technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of reducing catalyst activity and stability, improve the efficiency of visible light catalytic degradation, improve uniformity Dispersion and stability improvement effects

Inactive Publication Date: 2014-12-24
HUBEI UNIV OF ARTS & SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

It shows that in the photocatalytic reaction, silver ions are reduced to

Method used

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  • Preparation method of visible-light nano composite photocatalyst AgCl-SnO2
  • Preparation method of visible-light nano composite photocatalyst AgCl-SnO2
  • Preparation method of visible-light nano composite photocatalyst AgCl-SnO2

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Example Embodiment

[0025] Example 1:

[0026] Then add 0.2 mol / L AgNO 3 Solution 20mL, add 0.5 mol / L NH dropwise 3 ·H 2 O until the solution is just transparent, forming liquid sol A; weigh 0.6g of SnCl 4 ·5H 2 O and 0.05g of CTAC were added to 10 mL of 0.01mol / L dilute hydrochloric acid solution, stirred and mixed to obtain mixed solution B; then under stirring, mixed solution B was added dropwise to liquid sol A, and continued stirring for 1 hour to make both Mix uniformly; then, pour the mixture into a 200mL autoclave lined with polytetrafluoroethylene, keep it for 12 hours at 180℃, and then cool to room temperature naturally; finally take out the mixture containing white precipitate, centrifuge it, and wash with distilled water 2 times, and then washed with ethanol once, and the precipitate was vacuum dried at 60°C for 6 hours to obtain visible light catalytically active AgCl-SnO 2 Nano composite photocatalyst.

[0027] figure 1 The scanning electron microscope SEM images of the composite catal...

Example Embodiment

[0031] Example 2:

[0032] In order to test AgCl and SnO 2 The effect of different ratios on the photocatalytic activity of the sample. In addition to the different ratios of the two, other reaction conditions such as: CTAC amount (0.05g), reaction temperature (180°C), reaction time (12 hours), calcination time (2 hours) ), AgNO 3 The concentration (0.2 mol / L) and so on are exactly the same as in Example 1. The results show that when AgCl accounts for AgCl and SnO 2 When the molar amount is 70%, the prepared AgCl-SnO 2 The composite material has the best photocatalytic activity. The results show that the conduction band position of AgCl is higher than that of SnO 2 In the photocatalytic reaction, the photogenerated electrons on the AgCl conduction band will be transferred to the SnO 2 The transfer on the conduction band reduces the recombination rate of photo-generated electrons and holes, and improves the catalytic degradation efficiency of the catalyst.

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Abstract

The invention discloses a preparation method of a high-stability visible-light nano composite photocatalyst AgCl-SnO2. The composite catalyst consists of tin oxide with a semiconductor characteristic and silver chloride with visible-light catalytic activity, wherein the mole ratio of AgCl is 0-1.0, and the other component is nano tin dioxide powder. The method comprises the steps of preparing transparent lyosol from silver nitrate and ammonia water, dropwise adding a diluted hydrochloric acid solution containing tin tetrachloride and N-hexadecyltrimethylammonium chloride into the lyosol to obtain a mixed solution, and then putting the mixed solution into a high-pressure kettle for reaction to simultaneously separate out AgCl and SnO2 to form the visible-light nano composite photocatalyst AgCl-SnO2. The prepared photocatalyst is high in visible-light catalytic activity and high in stability; the reaction mechanism is that nano AgCl and SnO2 are compounded; under irradiation excitation of visible light, nano AgCl generates an electron-hole pair so as to realize visible-light catalytic activity; the position of an AgCl guide band is higher than that of SnO2, so that photoproduction electrons on the guide band can be easily transferred onto SnO2 and cannot reduce silver ions any more, and the stability of AgCl can be improved. According to the method, the problems that the AgCl photocatalyst is relatively low in visible-light catalytic activity and stability are solved, and the method is easy to operate.

Description

technical field [0001] The invention relates to a highly stable visible light nanocomposite photocatalyst AgCl-SnO 2 method of preparation. technical background [0002] Currently the most widely used TiO 2 Photocatalysts have excellent activity and stability, but require ultraviolet light (only 4.5% of the solar spectrum) to be excited to produce photocatalytic activity, which severely limits its practical application. Therefore, it is very necessary to synthesize new photocatalysts that can effectively utilize the visible light (45% of the solar spectrum) in sunlight. One of the strategies is to develop new and more efficient visible-light photocatalysts (such as CdS, WO 3 ,Cu 2 O, Bi 2 o 3 etc.), it has been practically applied in solar energy purification of environmental pollution. Among many new photocatalysts, Ag-based catalysts such as Ag 3 PO 4 , AgSbO 3 、Ag 2 O, AgVO 3 , AgX (X=Br, I), AgNbO 3 , AgMO 2 (M=Al, Ga, In, etc.), Ag 2 CO 3 etc. have stro...

Claims

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Application Information

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IPC IPC(8): B01J27/10
Inventor 梁英戴高鹏刘素芹
Owner HUBEI UNIV OF ARTS & SCI
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