Nis/zns visible light photocatalyst with flower clusters and preparation method thereof

Abstract

The present invention discloses a flower NiS having tufted / ZnS visible light catalyst and preparation method, the NiS / ZnS photocatalyst material visible parts in a weight ratio of 1 to 5 parts comprising an inorganic zinc salt, 2 ~ 10 parts by thioacetamide or thiourea, 38 to 50 parts of ethylenediamine or ethanolamine, 0.01 to 0.02 parts of an inorganic nickel salt. Firstly, inorganic zinc salts, thioacetamide or thiourea added to the vessel containing ethanolamine or ethylenediamine, stirred under conditions of less than 45 ℃ evenly, standing 15 ~ 20min, to obtain a suspension; at a temperature of 140 a microwave reactor at 150 ~ 4 ~ 5min, the autoclave was cooled to room temperature to obtain ZnS flower tufted precursor complex; conditions at a temperature of 140 ~ 150 ℃ microwave reaction 20 ~ 25min, to give primary products, obtained after centrifugation and dried flower having tufted NiS / ZnS photocatalyst visible. The method of the present invention is simple, low cost, and can be recycled raw material for extensive recycling, and having excellent visible light photocatalytic hydrogen production activity under visible light irradiation, to promote the industrialization of Photocatalytic hydrogen production.

Description

technical field [0001] The invention relates to the field of photocatalysts, and specifically refers to a NiS / ZnS photocatalyst with special morphology, a NiS / ZnS visible light photocatalyst with flower clusters. Background technique [0002] With the huge energy crisis brought about by the impending depletion of fossil energy, it is imminent to develop clean and renewable new energy. Hydrogen energy, known as "future oil", has a high combustion value and zero pollution, and has been generally regarded as one of the ideal ways to relieve energy and environmental pressure in the new century. Among the means of hydrogen energy development, the use of solar photocatalysis Hydrogen production by splitting water is one of the most ideal and promising means for photochemical conversion and storage of solar energy. Water resources are extremely abundant on the earth, and this technology, which can produce hydrogen and oxygen using only sunlight and water, will become "one of the i...

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Problems solved by technology

[0006] 1) The commonly used sulfide photocatalyst CdS is poisonous, and non-toxic ZnS is often compounded with toxic CdS to solve the problem of environmental pollution;

[0007] (2) Metal composite sulfide photocatalysts are mostly prepared by high-temperature calcination and solvothermal method. The high-temperature calcination is a bulk photocatalyst without special morphology. The separation advantage of photogenerated charges and holes brought by the size effect is not, so the photocatalytic hydrogen production efficiency of bulk photocatalysts without special morphology is generally low, because photogenerated charges and holes are very easy to recombine

Ordinary solvothermal method has a long reaction time (more than 20h), rough grain shape control, easy to obtain spherical and sheet-shaped photocatalysts, and difficult to obtain photocatalysts with other shapes. It is necessary to solve the long reaction cycle and difficult shape control of traditional preparation methods. The problem

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