Method for preparing nanometer indium cadmium sulfide-indium hydroxide composite photocatalyst

Abstract

The invention relates to a method for preparing a nanometer indium cadmium sulfide-indium hydroxide composite photocatalyst. The chemical formula of the composite photocatalyst is CdIn2S4-In(OH)3. The catalyst is prepared from indium chloride, cadmium chloride, thiourea and deionized water by a hydrothermal method. According to the XRD (X-Ray Diffraction) spectrogram of the catalyst, along with the prolonging of hydrothermal time, the diffraction peak of In(OH)3 of a sample is gradually weakened and the diffraction peak of CdIn2S4 is gradually enhanced to form the CdIn2S4-In(OH)3 composite photocatalyst; no other impurity peak is found in the spectrogram. The method disclosed by the invention has the advantages that the method is simple in process and simple and convenient in operation; the obtained composite photocatalyst has very high photocatalytic activity and is used for performing catalytic reduction on CO2 to obtain methyl formate under the irradiation of ultraviolet light by taking methanol as a solvent, CO2 can be effectively reduced into organic ester and the green conversion is realized.

Description

technical field [0001] The invention relates to a preparation technology of a composite photocatalyst, in particular to a preparation method of a nanometer indium cadmium sulfide-indium hydroxide composite catalyst. Background technique [0002] Photocatalytic reduction of CO 2 It is a photocatalyst that converts light energy into electrical energy by using the photoelectric effect under the irradiation of light. Compared with other methods, it has more advantages. The reaction can not only be carried out at normal temperature and pressure, but also the use of clean energy sunlight will not produce excess CO during the reaction 2 . Sulfide semiconductor nanomaterials with different properties were prepared by a simple hydrothermal method and a solvent method, and they were used as photocatalysts to reduce CO with methanol as a solvent. 2 , convert it into organic products with high added value such as HCOOH, HCHO, CH 3 OH, CH 4 and other substances, so as to eliminate C...

AI Technical Summary

Problems solved by technology

[0003] The catalytic efficiency of various photocatalysts currently developed is low, the light absorption wavelength range of semiconductors is narrow (mainly in the ultraviolet region), the equilibrium conversion rate is low, and the loading rate of two or more catalysts is low due to morphology problems. In addition, it is difficult for a single semiconductor to simultaneously satisfy the bandgap width, the position of the valence band and the conduction band, and the inhibition of electron and hole recombination required by the catalytic reaction. UV and visible light) new nano-photocatalytic materials as the main research direction

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