Preparation method of CdS/g-C3N4 dual-nanosheet composite photocatalyst

Abstract

The invention provides a preparation method of a CdS / g-C3N4 dual-nanosheet composite photocatalyst. The method comprises, through a gas template method, mixing and grinding a gas template and carbon nitride precursor to sinter within one step in inert atmosphere to obtain a g-C3N4 nanosheet, then adding the prepared g-C3N4 nanosheet into diethylenetriamine (DETA) solution containing cadmium chloride hemihydrate (CdCl2*2.5H2) and powdered sulfur (S) to react under oil bath heating to prepare a CdS / g-C3N4 material in a special structure, namely, a dual-nanosheet structure. The preparation methodof the CdS / g-C3N4 dual-nanosheet composite photocatalyst applies a semiconductor compositing method; when applied to photocatalytic H2O2 production, CdS / g-C3N4 dual-nanosheets can be highly effectivein catalytic activity effectively improve the photocatalytic activity of g-C3N4 nanosheets as well as effectively weaken photo-corrosion of CdS, thereby having a good application prospect in the photocatalytic fields such as photocatalytic hydrogen production, CO2 reduction and organic pollutant degradation.

Description

technical field [0001] The invention relates to a photocatalytic material capable of efficiently preparing hydrogen peroxide, belonging to the field of photocatalysis. Background technique [0002] Hydrogen peroxide is a clean, environment-friendly oxidant, and only water is used as a by-product in the reaction. It is widely used in industrial organic synthesis, pulp bleaching, wastewater treatment and sterilization. At the same time, hydrogen peroxide is also considered to be a new generation of clean energy. At present, the industrial production of hydrogen peroxide is mainly based on the anthraquinone method, which requires multiple hydrogenation and oxidation steps, consumes a lot of energy and pollutes the environment. Some researchers use hydrogen (H 2 ) and oxygen (O 2 ) directly prepare hydrogen peroxide under the catalysis of palladium (Pd) or gold-palladium alloy (Au-Pd), while hydrogen / oxygen (H 2 / O 2 ) mixed gas is prone to explosion. Therefore, developing ...

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Problems solved by technology

As a way to work with g-C 3 N 4 Composite narrow-bandgap semiconductor material, cadmium sulfide (CdS) has a negative reduction potential and strong reduction ability, but due to the narrow bandgap width of CdS, it is unstable and prone to photocorrosion under light, which affects the photocatalytic activity. Seriously limit the development of CdS in the field of photocatalysis

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