A three-dimensional cyclodextrin/graphene airgel composite adsorption material containing amidoxime group and its preparation method and application

Abstract

The invention relates to a three-dimensional cyclodextrin / graphene airgel composite adsorption material containing amidoxime groups and its preparation method and application. The invention uses amidoxime-containing diaminomaleonitrile and graphene oxide The combination of the oxygen functional group and the oxygen-containing functional group of the cyclodextrin, on the one hand, introduces the amidoxime group, which greatly enhances the selective adsorption capacity of the composite material for hexavalent uranium, on the other hand, the amidoximated diaminomaleonitrile is rich in Contains amino groups, which can react with the oxygen-containing groups on the graphene oxide sheet and the oxygen-containing groups on the carboxymethyl-β-cyclodextrin, so that the amidoxime group can be cross-linked to the graphene airgel , increasing the cross-linking degree of airgel is beneficial to the formation of airgel, and at the same time, the specific surface area of ​​the composite material is greatly improved, which endows the material with a strong adsorption capacity and is used to enrich hexavalent uranium with a high enrichment rate , 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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