Silver chromate/sulfur-doped carbon nitride Z-type photocatalyst and preparation method thereof

Abstract

The invention discloses a silver chromate / sulfur-doped carbon nitride Z-type photocatalyst. The silver chromate / sulfur-doped carbon nitride Z-type photocatalyst comprises carbon nitride, wherein sulfur is doped in the carbon nitride to form sulfur-doped carbon nitride, and the surface of the sulfur-doped carbon nitride is modified with silver chromate. A preparation method comprises the followingsteps of: uniformly mixing melamine, trithiocyanuric acid and ultrapure water, drying to obtain a mixture; calcining the mixture, grinding to obtain the sulfur-doped carbon nitride; mixing the sulfur-doped carbon nitride, silver-ion solution and dichromate solution to react, thus obtaining the silver chromate / sulfur-doped carbon nitride Z-type photocatalyst. The silver chromate / sulfur-doped carbonnitride Z-type photocatalyst disclosed by the invention has the advantages of strong light-absorbing capability, low photo-induced electron-hole recombination rate, good photocatalytic performance and good stability and the like, and is a novel photocatalytic material. The preparation method has the advantages of simple process, low cost and the like, is suitable for large-scale preparation and is beneficial to industrial production, and conditions can be controlled easily.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a silver chromate / sulfur-doped carbon nitride Z-type photocatalyst and a preparation method thereof. Background technique [0002] With the continuous development of society, the problems of water pollution and shortage are becoming more and more obvious, and it is urgent to find an energy-saving, environmentally friendly and efficient water pollution control technology to solve these problems. Photocatalytic technology is to purify pollutants through the redox ability of semiconductor photocatalysts under light conditions, and has shown good application prospects. In recent years, carbon nitride (g-C 3 N 4 ) as a non-metallic semiconductor photocatalyst has attracted extensive attention due to its suitable energy band position, stable chemical performance, low cost and easy preparation. Theoretically g-C 3 N 4 The energy gap is about 2.7 eV, and it can use sunlight wit...

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Problems solved by technology

Doping with non-metallic sulfur element is a safe and effective doping method, which can improve the g-C 3 N 4 The electronic structure plays an important role, but the existing sulfur-doped carbon nitride synthesis process is cumbersome and complicated, and other substances N,N-dimethylformamide are introduced, which may introduce oxygen elements, which will be detrimental to the performance of the catalyst. influences

In addition, silver chromate (Ag 2 CrO 4 ) is a silver-based semiconductor photocatalyst. Its small energy gap (1.7 eV) can respond well to visible light and increase the absorption of visible light by photocatalysts. However, by constructing Ag 2 CrO 4 / g -C 3 N 4 The heterojunction structure still cannot effectively improve the structural and optical properties of carbon nitride, making it difficult to improve the performance of the catalyst, which severely limits the practical application of photocatalysts.

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