Graphite type carbon nitride composite photocatalytic material containing oxygen vacancy bismuth tungstate/oxygen-enriched structure as well as preparation method and application of graphite type carbon nitride composite photocatalytic material

Abstract

The invention discloses a graphite type carbon nitride composite photocatalytic material containing an oxygen vacancy bismuth tungstate/oxygen-enriched structure as well as a preparation method and application of the graphite type carbon nitride composite photocatalytic material. The composite photocatalytic material is formed by compounding oxygen vacancy-containing bismuth tungstate and graphitetype carbon nitride with an oxygen-enriched structure. The preparation method comprises the following steps: calcining dicyandiamide and ammonium tungstate used as raw materials to synthesize graphite type carbon nitride with an oxygen-enriched structure, and carrying out one-step hydrothermal method under the action of octadecyl trimethyl ammonium chloride by using bismuth nitrate pentahydrate,sodium tungstate dihydrate and graphite type carbon nitride with an oxygen-enriched structure as raw materials. The composite photocatalytic material disclosed by the invention has the advantages of strong stability, strong light capturing capability, high electron-hole pair separation efficiency, excellent photocatalytic performance and the like; the preparation method has the advantages of mildreaction conditions, simple process flow, low energy consumption, less material consumption and the like, is suitable for large-scale popularization and application, has a good antibiotic removal effect, and has a good application prospect in 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.

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