Amidoxime group-containing three-dimensional cyclodextrin/graphene aerogel composite adsorbing material and preparation method and application thereof

Abstract

The invention relates to an amidoxime group-containing three-dimensional cyclodextrin / graphene aerogel composite adsorbing material and a preparation method and application thereof. According to the preparation method, amidoximation diaminomaleonitrile is combined with an oxygen-containing functional group of graphene oxide and an oxygen-containing functional group of cyclodextrin, on one hand, anamidoxime group is introduced, the selective adsorption capacity of the composite material on hexavalent uranium is greatly enhanced, on the other hand, amidoximated diaminomaleonitrile is rich in amino groups, the graphene oxide can react with an oxygen-containing group on a graphene oxide sheet layer and an oxygen-containing group on carboxymethyl-beta-cyclodextrin, according to the preparationmethod, the graphene aerogel serves as a carrier, amidoxime groups are crosslinked to the graphene aerogel, the crosslinking degree of the aerogel is increased, formation of the aerogel is facilitated, meanwhile, the specific surface area of the composite material is greatly increased, the material is endowed with high adsorption capacity, the enrichment rate is high when the composite material is used for enriching hexavalent uranium, and the adsorption time is short.

Description

technical field [0001] The invention relates to a three-dimensional cyclodextrin / graphene airgel composite adsorption material containing amidoxime groups, a preparation method and application thereof, and belongs to the technical fields of chemistry and environment. Background technique [0002] As an important raw material for the nuclear industry, uranium has received extensive attention. The energy released by the fission of 1 kg of uranium nuclei is approximately equal to the chemical energy released when 2,700 tons of standard coal is burned. With the gradual development of the nuclear industry, the demand for uranium has also maintained a steady growth. There are abundant uranium reserves in seawater, about 4.5 billion tons, which is equivalent to a thousand times the uranium reserves on land. If it can be extracted economically and effectively, it will be an important supplement and guarantee for the stable development of nuclear power and nuclear forces. However, ...

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Problems solved by technology

[0006] In view of the deficiencies of the existing technology, especially the problems of low enrichment rate of hexavalent uranium, long adsorption time and low mechanical strength of the existing materials, the present invention provides a three-dimensional cyclodextrin / graphene gas condensation Adhesive composite adsorption material and its preparation method and application

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