Cobalt-aluminum hydrotalcite/bismuth-rich bismuth oxychloride composite photocatalyst as well as preparation method and application thereof

Abstract

The invention discloses a cobalt-aluminum hydrotalcite / bismuth-rich bismuth oxychloride composite photocatalyst and a preparation method and application thereof, the composite photocatalyst takes a cobalt-aluminum hydrotalcite nanosheet as a carrier, a bismuth-rich bismuth oxychloride nanosheet is modified on the carrier, and the mass percentage content of the cobalt-aluminum hydrotalcite nanosheet is less than or equal to 10%. The preparation method comprises the following steps: mixing the cobalt-aluminum hydrotalcite nanosheet, water, an alkaline solution, a chloride ion-containing solution and a bismuth ion-containing solution, and carrying out hydrothermal treatment on the obtained mixed solution. The composite photocatalyst disclosed by the invention has the advantages of wide photoresponse range, high photo-induced electron-hole separation efficiency, high photocatalytic activity, high stability, corrosion resistance and the like, can be used for efficiently degrading persistent organic pollutants in wastewater, and is high in use value and good in application prospect; and meanwhile, the preparation method of the catalyst has the advantages of simple synthesis method, low raw material cost, low energy consumption, short time consumption, easily controllable conditions and the like, is suitable for continuous large-scale batch production, and is convenient for industrial utilization.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a cobalt aluminum hydrotalcite / bismuth-rich bismuth oxychloride composite photocatalyst and a preparation method and application thereof. Background technique [0002] The application of semiconductor photocatalysts in the degradation of toxic and harmful organic pollutants is of great significance to the solution of environmental pollution. However, wide bandgap and low quantum efficiency are still the "bottleneck" of semiconductor photocatalysts. Therefore, it is of great significance to actively develop efficient and renewable photocatalysts with visible light response to fully utilize solar energy. In addition, the development of semiconductor heterojunctions is an effective way to solve these problems. The staggered energy level arrangement can accelerate the separation and migration of carriers, and can also expand the spectral range of light absorption. [0003] Amo...

AI Technical Summary

Problems solved by technology

However, the carrier transport of type-II heterojunction systems composed of semiconductors with random morphology structures is generally affected by factors such as lattice matching and interfacial charge transfer resistance, which limit their ability to promote space charge separation.

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