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 includes carbon nitride, and the carbon nitride is doped with sulfur element to form sulfur-doped Carbon nitride, sulfur-doped carbon nitride surface modified with silver chromate. The preparation method includes the following steps: mix melamine, thiocyanuric acid and ultrapure water evenly and dry to obtain a mixture; calcine and grind the mixture to obtain sulfur-doped carbon nitride; mix sulfur-doped carbon nitride and silver. The ionic solution and the dichromate solution are mixed and reacted to obtain a silver chromate / sulfur-doped carbon nitride Z-type photocatalyst. The silver chromate / sulfur-doped carbon nitride Z-type photocatalyst of the present invention has the advantages of strong light absorption ability, low photogenerated electron-hole recombination rate, good photocatalytic performance, and good stability. It is a new type of photocatalytic material. The preparation method has the advantages of simple process, easy control of conditions, low cost, etc., is suitable for large-scale preparation, and is beneficial to industrial production.

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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