Preparation method of ag/zno-carbon sphere ternary core-shell heterojunction photocatalyst with different microscopic morphology

Abstract

The invention discloses a preparation method of a Ag / ZnO-carbon sphere ternary core-shell heterojunction photocatalyst with different microscopic shapes, belonging to the technical field of synthesis of photocatalytic materials. The key points of the technical solution of the present invention are: the Ag / ZnO carbon sphere ternary core-shell heterojunction photocatalyst formed by wrapping carbon spheres with ZnO to form a core-shell structure, and Ag nanoparticles deposited on the surface of ZnO. The Ag / ZnO carbon sphere heterojunction photocatalyst with a specific morphology prepared by the present invention effectively improves the absorption of ZnO to visible light and the catalytic performance of visible light; the carbon sphere is used as a carbon material, which is easy to synthesize, and Low cost and environmentally friendly; the raw materials used in the synthesis process of the ternary core-shell structure photocatalyst are cheap and easy to obtain, green and environmentally friendly, the generation of ZnO, the direct growth of ZnO nanosheets (or hexagonal prisms) on carbon spheres, and the reduction of Ag+ to Ag nanoparticles are obtained through a one-step reaction, the method is simple, the conditions are mild, and the morphology of the photocatalyst can be effectively regulated only by adjusting the reaction parameters.

Description

technical field [0001] The invention belongs to the technical field of synthesis of photocatalytic materials, and in particular relates to a preparation method of Ag / ZnO-carbon sphere ternary core-shell heterojunction photocatalysts with different microscopic shapes. Background technique [0002] As a photocatalyst, ZnO has attracted widespread attention because of its cheap and easy-to-obtain, environmental friendliness, and excellent ultraviolet photocatalytic performance. It affects the industrial application of ZnO. To this end, people use different means to improve the visible light catalytic performance of ZnO, among which the combination of noble metal Ag deposition and composite with carbon materials (graphene, carbon nanotubes) to form a ternary heterojunction is a more effective means. Existing literatures have reported the synthesis of ternary heterojunctions such as Ag / ZnO-graphene and Ag / ZnO-carbon nanotubes to improve the visible light photocatalytic performan...

AI Technical Summary

Problems solved by technology

At present, there are still the following problems in this field: (1) Although carbon materials such as graphene and carbon nanotubes have excellent physical and chemical properties, their synthesis process is relatively complicated and easily pollutes the environment, and the cost is relatively high ; (2) The synthesis of these ternary heterojunctions is usually to use ZnO and carbon materials to composite first, and then deposit Ag by photoreduction or reducing agent reduction, the process is cumbersome; (3) The reported ternary heterojunction Few have specific morphology, and the microscopic morphology of the material has an important impact on its photocatalytic performance

[0003] As a kind of carbon material, carbon spheres synthesized by glucose solution under hydrothermal conditions have the advantages of simple synthesis conditions, low cost, environmental friendliness, easy control of morphology, stable physical and chemical properties, and excellent electron transport properties. Photocatalyst compounding improves the separation efficiency of photogenerated electron-hole pairs, thereby achieving the purpose of improving its photocatalytic performance. Although there are reports in the literature that carbon spheres support CuO, CdS and other nanoparticles to improve the photocatalytic performance of materials, there is no carbon sphere loading. ZnO, especially the report of supporting ZnO with a certain morphology to form a core-shell heterojunction composite material

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