Preparation method for SnO2-based composite visible light photocatalyst

A photocatalyst and visible light technology, which is used in the preparation of new nanomaterials and composite photocatalysts, can solve the problems that photocatalysts cannot achieve visible light photocatalysis, and achieve stable photocatalytic performance, tight integration, and easy large-scale industrial production. Effect

Inactive Publication Date: 2014-06-18
YANGZHOU UNIV
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Problems solved by technology

[0005] The present invention uses SnO 2 and / SnS 2 The combination of the two realizes the absorption and catalysis under visible light, and solves the problem of traditional TiO 2 The problem that photocatalysts cannot achieve visible light photocatalysis, and the prepared composite heterostructures are tightly combined, which is conducive to the transfer of photogenerated carriers on the two energy bands, and is more conducive to the separation of photogenerated carriers

Method used

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  • Preparation method for SnO2-based composite visible light photocatalyst
  • Preparation method for SnO2-based composite visible light photocatalyst
  • Preparation method for SnO2-based composite visible light photocatalyst

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Embodiment Construction

[0014] 1. SnS 2 Preparation of powder:

[0015] 3.506 g of crystalline tin tetrachloride (SnCl 4 ·5H 2 O) and 1.5026 g of thioacetamide were added to 38 ml of deionized water, stirred with a magnet, and at the same time, 2 ml of glacial acetic acid was added to the solution, and stirred for 6 hours until the solution appeared light yellow. The stirred mixed solution was added into a polytetrafluoroethylene high-pressure reactor, and reacted at 120° C. for 12 hours. Naturally cool to room temperature to obtain the solids produced by the reaction, then wash with deionized water, centrifuge, and dry at 70°C to obtain SnS 2 powder sample.

[0016] 2. SnO 2 / SnS 2 Preparation of Composite Nanostructures:

[0017] Dilute 30% H2O2 to 0.3%, 1.5%, 3% and 6% respectively with deionized water, and set aside.

[0018] Weigh 0.4 g of SnS 2 powder, add it to 38 ml deionized water, add a magnet to stir, and add 2 ml of different concentrations of H while stirring 2 o 2 solution, s...

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Abstract

The invention provides a preparation method for a SnO2-based composite visible light photocatalyst, belonging to the technical field of preparation of a novel nano material and a composite photocatalyst. The preparation method comprises the following steps: preparing SnS2 nano particles by a hydrothermal method; then partially oxidizing the SnS2 nano particles by using H2O2 under a hydrothermal environment to prepare the visible light photocatalyst with a SnO2 / SnS2 heterojunction composite structure. According to the preparation method, the SnO2 and the SnS2 are compounded to realize the absorption and the catalysis under visible light, and the problem that visible light photocatalysis can not be realized by a traditional TiO2 photocatalyst is solved; the prepared composite heterojunction structure is combined tightly so as to be good for transferring photon-generated carriers on two energy bands and separating the photon-generated carriers.

Description

technical field [0001] The invention belongs to the technical field of preparation of novel nanometer materials and composite photocatalysts. Background technique [0002] In the environmental field, due to the SnO 2 Good chemical stability and ideal oxidation ability for organic matter are widely used as photocatalysts to photodegrade organic pollutants, and have the advantages of good catalytic activity, long life, large surface area, and low pollution. But SnO 2 There are two key problems when being used as a photocatalyst. One is that the band gap is wide, and it can only absorb ultraviolet light with a wavelength less than 350 nm, while the ultraviolet radiation reaching the earth's surface only accounts for about 4% of the spectrum of solar radiation to the earth; Second, the quantum yield is low, the probability of carrier recombination is high, and the photocatalytic efficiency is low. Therefore, it is one of the existing problems to find new semiconductor materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04
Inventor 陈海涛张晨琪张丹朱骏曾祥华
Owner YANGZHOU UNIV
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