Graphene composite photocatalytic aerogel with hierarchical porous structure and preparation method thereof

Abstract

The invention provides graphene composite photocatalytic aerogel with a hierarchical porous structure and a preparation method thereof. The graphene composite photocatalytic aerogel has a lamellar structure and a three-dimensional structure and also has the hierarchical porous structure with a macropore, a mesopore and a micropore. An adsorption effect of graphene aerogel is combined with a photocatalysis effect of titanium dioxide, pollutants adsorbed to pores in the graphene aerogel and on the surface of the graphene aerogel are rapidly degraded by utilizing a photocatalysis effect of nano TiO2 and the graphene aerogel is generated in situ, so that the adsorption saturation time of the graphene aerogel is prolonged and the decontamination effect is greatly improved. The hierarchical porous structure in the composite graphene aerogel can be relatively conveniently regulated and controlled according to actual application requirements through changing types and adding amounts of added active carbon fibers, so that the universality that the graphene composite photocatalytic aerogel is applicable to different pollutants is improved. A whole set of synthesis process is simple and stirring is not needed in a chemical reduction in-situ self-assembling process; reaction conditions are moderate.

Description

technical field [0001] The invention belongs to the field of airgel preparation, in particular to a graphene composite photocatalytic airgel and a preparation method thereof. Background technique [0002] Graphene is a carbon atom sp 2 The hexagonal honeycomb structure two-dimensional atomic crystal formed by hybridization, its special two-dimensional structure makes it have excellent performance in many aspects such as electrical conductivity and thermal conductivity. However, graphene two-dimensional materials tend to agglomerate and accumulate due to the π-π interaction, resulting in reduced specific surface area, increased resistance, and greatly reduced performance, which limits the application of graphene to a certain extent. Graphene airgel (grapheneaerogel, GA) is a nanomaterial with a unique three-dimensional structure formed by using two-dimensional graphene as a building unit through curling and stacking between nanosheets, which can not only solve the problem of...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a graphene composite photocatalytic airgel with a multi-level pore structure and a preparation method thereof, so as to solve the existing graphene aerogels in the background art with single pore structure, insufficient adsorption capacity, and easy Problems such as secondary pollution, complex synthesis process, and harsh conditions

Images