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Ag2Mo2O7@AgBr composite photocatalyst and preparation method thereof

A composite catalyst, ag2mo2o7 technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of quantum yield photogenerated electron-hole pair recombination rate defects, application obstacles, etc. Strong controllability, high degradation efficiency, simple and easy-to-obtain raw materials

Active Publication Date: 2017-05-17
NANJING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, Ag 2 Mo 2 o 7 When used as a single catalyst, its quantum yield and recombination rate of photogenerated electron-hole pairs have relatively serious defects, which greatly hinders its application.

Method used

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  • Ag2Mo2O7@AgBr composite photocatalyst and preparation method thereof
  • Ag2Mo2O7@AgBr composite photocatalyst and preparation method thereof
  • Ag2Mo2O7@AgBr composite photocatalyst and preparation method thereof

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Effect test

Embodiment 1

[0035] Ag in this example 2 Mo 2 o 7 @AgBr composite photocatalyst, the specific preparation steps are as follows:

[0036] a) 2mmol AgNO 3 Dissolve in 50mL deionized water, add NH dropwise after complete dissolution 3 ·H 2 O, forming silver ammonium ion solution for subsequent use. At the same time 0.3mmol ammonium molybdate (NH 4 ) 6 Mo 7 o 24 Completely dissolve in 30mL deionized water, add the silver ammonia ion solution drop by drop under stirring condition, finish with HNO 3 Adjust the pH of the solution at 2. Transfer the above mixed solution to a 250mL round-bottomed flask, and react at a constant temperature of 60°C for 20h under stirring conditions. After the reaction, the product was washed with deionized water and absolute ethanol three times respectively, and the collected product was dried in an oven at 50°C for 12h. get Ag 2 Mo 2 o 7 powder.

[0037] b) Take 0.5196g Ag 2 Mo 2 o 7 The sample was ultrasonically dispersed in 30mL of deionized wate...

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Abstract

The invention discloses a preparation method of a nanorod-like Ag2Mo2O7@AgBr composite photocatalyst. According to the preparation method, nanorod-like Ag2Mo2O7 is prepared by a low-temperature liquid phase constant temperature heating method, and AgBr nano particles are generated on the surface of the Ag2Mo2O7 through an ion exchange method. A monoclinic phase Ag2Mo2O7 is prepared on the basis of the method, and the AgBr nano particles are generated through ion exchange by taking the monoclinic phase Ag2Mo2O7 as a precursor, so that the utilization of visible light by the photocatalyst is increased, the electron-hole recombination rate is decreased, the photocatalysis activity of Ag2Mo2O7 is improved, and rhodamine B dyes can be effectively degraded.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, and relates to a photocatalyst and a preparation method, in particular to an Ag 2 Mo 2 o 7 @AgBr composite photocatalyst and its preparation method. Background technique [0002] The use of photochemical methods to treat dye pollutants has many advantages, among which the traditional photocatalyst TiO 2 It is the most widely used, but its bandgap width is 3.2eV, and the utilization of natural sunlight is very limited. Therefore, the development of new visible light-responsive photocatalysts plays an extremely important role in the development of the field of catalysis. [0003] Among them, silver-based semiconductor optical materials like Ag 2 O, Ag 2 S, AgX (Cl, Br, I), etc. all have suitable band gaps and can make full use of sunlight. However, there are also obvious shortcomings, such as: photocorrosion, the reason is that the transfer rate of photogenerated elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/132B01J35/02B01J35/00
CPCB01J27/132B01J35/00B01J35/30B01J35/39
Inventor 王雄瞿佳华
Owner NANJING UNIV OF SCI & TECH
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