Amidoxime-group-modified cyclodextrin/sodium alginate gel ball composite adsorption material as well as preparation method and application thereof

Abstract

The invention relates to an amidoxime-group-modified cyclodextrin / sodium alginate gel ball composite adsorption material which is prepared by combining amidoximated diaminomaleonitrile with an oxygen-containing functional group of sodium alginate and an oxygen-containing functional group of cyclodextrin, so that on the one hand, amidoxime groups are introduced, adsorption sites in gel are increased, and selective adsorption capacity of composite material to hexavalent uranium is greatly enhanced; on the other hand, the sodium alginate and the cyclodextrin enhance the mechanical properties of the material and obtain stronger mechanical properties, so that the material has good mechanical properties, can be repeatedly used for multiple times, is easy to separate from water, and adsorption sites in the composite aerogel are also increased; the composite adsorption material is used for enriching hexavalent uranium, is high in enrichment rate and short in adsorption time, is not influencedby seawater salinity, can be repeatedly used, is easily separated from a water body, and is easy to recover and recycle.

Description

technical field [0001] The invention relates to an amidoxime-modified cyclodextrin / sodium alginate gel ball composite adsorption material and a preparation method and application thereof, belonging to the technical fields of chemistry and environment. Background technique [0002] With the rapid development of the global economy, the demand for energy is increasing day by day. The limited availability of fossil fuels and the problems associated with their combustion have led to an increasing focus on sustainable clean energy. As one of the clean energy sources, nuclear energy has received extensive attention. With the gradual development of the nuclear industry, people's demand for uranium resources, its main raw material, is also gradually increasing. Existing uranium deposits on land are estimated to be only enough for human use for about one hundred years. There are about 4.5 billion tons of uranium in seawater, equivalent to a thousand times that of uranium mines on l...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, especially the poor uranium absorption ability and low mechanical strength of the existing composite materials, which cannot satisfy the problem of high-efficiency enrichment of uranium from seawater with high salinity, the present invention provides an amidoxime-modified Cyclodextrin / sodium alginate gel ball composite adsorption material and its preparation method and application

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