Oxygen-vacancy bismuth tungstate/oxygen-rich structure graphitic carbon nitride composite photocatalytic material and preparation method and application thereof

Abstract

The invention discloses a graphite-type carbon nitride composite photocatalytic material with an oxygen-vacancy bismuth tungstate / oxygen-rich structure, a preparation method and an application thereof. The composite photocatalytic material is composed of bismuth tungstate containing oxygen vacancies and graphite carbon nitride with oxygen-rich structure. The preparation method comprises: first, dicyandiamide and ammonium tungstate are used as raw materials to calcinate and synthesize graphite carbon nitride with oxygen-rich structure; The raw material is prepared in one step by a hydrothermal method under the action of octadecyltrimethylammonium chloride. The composite photocatalytic material of the present invention has the advantages of strong stability, strong light capture ability, high electron-hole pair separation efficiency, excellent photocatalytic performance, etc., and its preparation method has the advantages of mild reaction conditions, simple process flow, low energy consumption, It is suitable for large-scale promotion and application, and has a good effect on the removal of antibiotics. It has a good application prospect in the photocatalytic degradation of antibiotic wastewater.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a composite photocatalytic material and its preparation method and application, in particular to an oxygen-vacancy-containing bismuth tungstate / oxygen-rich structure graphite-type carbon nitride composite photocatalytic material and its preparation method and application . Background technique [0002] In recent years, the water pollution caused by organic pollutants has become a serious environmental pollution problem, especially the pollution caused by antibiotic organic substances, which has attracted worldwide attention. Antibiotics are used in the treatment of many bacterial infections because of their high efficiency and broad-spectrum, but because they are difficult to biodegrade and exist stably in water, they are easily transformed into teratogenic and carcinogenic substances, threatening the survival of humans and aquatic animals. Therefore, the removal of antibiotics...

AI Technical Summary

Problems solved by technology

Bismuth tungstate has a narrow band gap (2.8eV) and shows good photoresponsiveness in the ultraviolet-visible region. However, in practical applications, bismuth tungstate is still limited by the fast recombination of electron-hole pairs and limited light harvesting ability.

It is reported that the construction of heterojunction can solve this problem well, but the construction of traditional heterojunction can easily lead to the weakening of redox performance.

Images