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

Abstract

The invention belongs to the field of preparation of photocatalysts, and particularly discloses a preparation method of a visible light catalyst characterized by tight connection, and solves the technical problems that at present, a pure g-C3N4 photocatalyst has low catalytic activity, a relatively narrow spectral response range and CdS photocorrosion. The preparation method comprises the following steps: (1), synthesizing a g-C3N4 material according to a high-temperature thermal polymerization method using tripolycyanamide as a precursor; (2), synthesizing hollow microsphere CdS according toa hydrothermal method using thiourea as a sulfur source (3), synthesizing a CdS / g-C3N4 composite photocatalyst according to a low-temperature calcination method. The CdS / g-C3N4 composite photocatalystprovided by the invention can achieve efficient degradation of an organic pollutant, and has good settling performance, so that separation and recycling of the composite photocatalyst are facilitated; due to the tight connection between CdS and g-C3N4, separation and transfer of photogenerated charges at a connection interface of the composite photocatalyst can be accelerated, the photocatalyticactivity of the photogenerated charges can be enhanced, and the cyclic stability of the photogenerated charges can be improved.

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...

AI Technical Summary

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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