A kind of preparation method of visible light catalyst with tight connection

Abstract

The invention belongs to the field of photocatalyst preparation, specifically a preparation method of a closely connected visible light catalyst, which solves the current problems of pure g-C 3 N 4 Photocatalysts have technical problems such as low catalytic activity, narrow spectral response range and CdS photocorrosion. The invention includes the following steps: (1) g‑C 3 N 4 The material is synthesized using a high-temperature thermal polymerization method using melamine as a precursor; (2) hollow microspheres CdS are synthesized using a hydrothermal method using thiourea as a sulfur source; (3) CdS / g‑C 3 N 4 The composite photocatalyst is synthesized by low-temperature calcination. The CdS / g-C proposed by the present invention 3 N 4 The composite photocatalyst can achieve efficient degradation of organic pollutants and has good sedimentation performance, which is beneficial to the separation and recovery of the composite photocatalyst. Due to the tight connection between the two, the separation and transfer of photogenerated charges at the composite photocatalyst connection interface can be accelerated, enhancing its photocatalytic activity and improving its cycle stability.

Description

technical field [0001] The invention belongs to the field of preparation of photocatalysts, in particular to a method for preparing visible light catalysts with close connections. Background technique [0002] Organic pollutants in industrial wastewater pollute water bodies, endanger human health and destroy ecosystems. As a clean energy, solar energy is a cheap and available renewable energy. As an environmentally friendly material, semiconductor photocatalyst can degrade organic pollutants by using solar energy, and is expected to purify water [1] . So far, TiO 2 Photocatalyst is recognized as one of the most promising photocatalysts, but its high electron-hole recombination rate and wide energy band gap can only respond to the wavelength band in the ultraviolet region, which seriously limits its practical application. [2-3] . Therefore, the search for photocatalysts with high efficiency in the visible light region is the key to the practical application of photocatal...

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Problems solved by technology

[0013] The present invention is to solve following two technical problems: (1) pure g-C 3 N 4 Photocatalysts have the technical problems of high photogenerated electron-hole recombination rate, low utilization rate of visible light, and poor recycling ability; (2) CdS photocatalyst has technical problems of high photogenerated electron-hole recombination rate, poor stability and recyclability, Provided is a preparation method of a visible light catalyst with tight junctions

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