Titanium dioxide/titanium dioxide/black phosphorus nanosheet composite photocatalyst and preparation method and application thereof

Abstract

The invention discloses a titanium dioxide / titanium dioxide / black phosphorus nanosheet composite photocatalyst and its preparation method and application. The composite photocatalyst uses black phosphorus nanosheets as carriers, modifies the surface of the black phosphorus nanosheets with few-layer titanium dioxide, and grows titanium dioxide in-situ within the few-layer titanium dioxide. The preparation method includes preparing a black phosphorus nanosheet suspension, preparing few-layer titanium dioxide, and adding the few-layer titanium dioxide into the black phosphorus nanosheet suspension to perform a hydrothermal reaction to obtain a product. The composite photocatalyst of the present invention has strong light absorption ability, low photogenerated electron-hole recombination rate, good photocatalytic performance, good stability, simple preparation method, easy control of conditions, low cost, and is suitable for large-scale industrial production. This composite photocatalyst can be used to degrade antibiotic wastewater, with high degradation efficiency, good removal effect, high safety, no secondary pollution, and has good practical application prospects.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis and relates to a composite photocatalyst, in particular to a composite photocatalyst of trititanium dicarbide / titanium dioxide / black phosphorus nanosheet and its preparation method and application. Background technique [0002] With the development and progress of society, antibiotics have been widely used. Their excessive use and incomplete metabolism make antibiotics often detected in natural water, sewage, soil and other environmental media. These antibiotics that have not been metabolized are likely to be It affects the development of biological cells, the circulation of the ecosystem and promotes the reproduction of drug-resistant pathogenic bacteria, thus adversely affecting the ecological environment and human health. At present, the commonly used methods for removing antibiotics in water environment at home and abroad include biological methods, physicochemical methods, electrochemi...

AI Technical Summary

Problems solved by technology

However, in previous studies, the photocatalysts used for photocatalytic degradation still have the following problems: low light utilization efficiency, fast photogenerated electron-hole recombination, poor photocatalytic performance, and poor stability. Greatly limit the wide application of photocatalytic degradation

However, the existing black phosphorus-based heterojunction photocatalytic materials still have problems such as weak light absorption ability and slow photogenerated electron-hole separation rate, which limit the photocatalytic performance of the material.

Therefore, how to comprehensively improve the problems of weak light absorption ability, slow photogenerated electron-hole separation rate, and poor photocatalytic performance in the existing black phosphorus-based heterojunction materials, and obtain a kind of material with strong light absorption ability and photogenerated electron-hole recombination rate. The preparation method of the composite photocatalyst with low cost, high photocatalytic performance and good stability and its matching process is simple, the conditions are easy to control, and the cost is low, which is of great significance for further expanding the application range of photocatalytic technology.

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