Silver phosphate/nitrogen-doped carbon quantum dot/bismuth vanadate Z type photocatalyst, preparation method and application thereof

Abstract

The invention discloses a silver phosphate / nitrogen-doped carbon quantum dot / bismuth vanadate Z type photocatalyst, a preparation method and application thereof. The Z type photocatalyst adopts bismuth vanadate as the carrier, and the bismuth vanadate is modified with nitrogen-doped carbon quantum dots and silver phosphate. The preparation method includes: preparation of a nitrogen-doped carbon quantum dot modified bismuth vanadium material; and mixing of the nitrogen-doped carbon quantum dot modified bismuth vanadium material with silver nitrate and disodium hydrogen phosphate dodecahydrate in water so as to obtain the Z type photocatalyst. The Z type photocatalyst provided by the invention has the advantages of high light absorption efficiency, high photoinduced electron-cavity separation efficiency, high photocatalytic activity, strong redox ability and the like, can efficiently degrade antibiotic wastewater, also has the advantages of simple application method, high degradation efficiency and good reutilization, and has good practical application prospect. The preparation method provided by the invention has the advantages of simple preparation process, easily controllable operating conditions, simple and easily available raw materials, low preparation cost and the like, and is suitable for continuous and large-scale mass production.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis and relates to a Z-type photocatalyst and its preparation method and application, in particular to a silver phosphate / nitrogen-doped carbon quantum dot / bismuth vanadate Z-type photocatalyst and its preparation method and application. Background technique [0002] Antibiotics are widely used all over the world as an important drug for the treatment of pathogenic bacterial infections. Today, the continuous accumulation of antibiotics in ecosystems has become a persistent pollutant that seriously threatens human health. The application of semiconductor photocatalysis technology to degrade toxic and harmful persistent pollutants such as antibiotics in water is of great significance to solve the problem of water pollution. However, the wide bandgap and low light absorption efficiency of semiconductor photocatalytic materials are the main factors limiting their large-scale applications. Therefo...

AI Technical Summary

Problems solved by technology

The Z-type mechanism semiconductor can not only retain the strong oxidizing valence band and the strong reducing conduction band to obtain high redox performance, but also, due to the construction of the Z-type semiconductor, the photogenerated electron-hole separation rate has been greatly improved. , but binary Z-type photocatalytic materials still have disadvantages such as low light absorption efficiency and low photocatalytic efficiency.

Therefore, if the problems of low light absorption efficiency, weak photogenerated carrier separation ability, and poor photocatalytic activity of bismuth vanadate are comprehensively improved, it is still a technical problem that needs to be solved urgently in this field, and to obtain a photogenerated electron-space Silver phosphate / nitrogen-doped carbon quantum dots / bismuth vanadate Z-type photocatalyst with high hole separation efficiency, high photocatalytic activity and strong redox ability is of great significance for the efficient degradation of pollutants (such as antibiotics) in wastewater

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