Chitosan hybrid bismuth oxybromide micro-nano multi-layer material and preparation and application thereof

Abstract

The invention discloses a preparation method of a chitosan hybrid bismuth oxybromide micro-nano multi-layer material. The preparation method comprises the steps of: slowly adding a chitosan dispersioninto a bismuth salt solution, conducting magnetic stirring for even dispersing; slowly adding a bromine salt solution into the system under stirring, conducting stirring for even dispersing, then transferring the reaction system into a reaction kettle, conducting hydrothermal reaction at 120-300 DEG C for 6-20 h, and separating a product by suction filtration, conducting washing with distilled water, and conducting drying in vacuum to obtain the chitosan bismuth oxybromide micro-nano multilayer material. According to the invention, chitosan is adopted as a template guiding agent and a structure inducing agent, and a bismuth salt is combined with a bromine salt to form bismuth oxybromide by polymer hydrothermal assist, and the bismuth oxybromide photocatalytic material is promoted by an amino group in a chitosan molecular segment to have highly exposed crystal plane and rich oxygen vacancies, thus further the absorption of the catalyst in a visible region is expanded, and the chitosanhybrid bismuth oxybromide micro-nano multi-level photocatalytic material has high photocatalytic activity under simulated sunlight.

Description

technical field

[0001] The invention relates to a preparation method of a chitosan hybrid bismuth oxybromide micro-nano multi-level material, which is mainly used as a photocatalyst for the degradation treatment of organic pollutants, and belongs to the technical field of composite materials and the technical field of photocatalysis. Background technique

[0002] Water resources are an indispensable natural resource in human production and life. However, with the frequent industrial activities of human beings, the phenomenon of water pollution has become more and more serious, and it has gradually become the main environmental problem that countries need to solve. For example: a variety of organic dyes in textile wastewater are not only carcinogens, but also inhibit the transmission of sunlight in water bodies and affect the photosynthesis of water body organisms. In order to solve the above problems, scientists have developed many water treatment methods such as adsorption...

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