Method for preparing polyamidoxime/graphene nanobelt composite aerogel and method for separating and enriching uranium

Abstract

The invention discloses a method for preparing polyamidoxime / graphene nanobelt composite aerogel and separating and enriching uranium, which is characterized by comprising the following steps of: firstly, axially cutting a multiwalled carbon nanotube by using a potassium permanganate oxidation method to prepare a graphene oxide nanobelt; then adding into a mixed solution of acrylonitrile and ammonium persulfate which are fully mixed, and primarily preparing polyacrylonitrile / graphene nanobelt composite hydrogel by adopting a solvothermal polymerization method; and then converting cyano groupsinto amidoxime groups by virtue of a reaction between the cyano groups and hydroxylamine under an alkaline condition so as to obtain polyamidoxime / graphene nanoribbon composite hydrogel, and finally,carrying out low-temperature freeze drying so as to obtain the polyamidoxime / graphene nanoribbon composite aerogel. The prepared polyamidoxime / graphene nanobelt composite aerogel is high in grafting rate, uniform in density distribution, stable in structural performance and rich in special functional groups of uranium, the uranium can be effectively and selectively removed from different uranium-containing water bodies, the adsorbed aerogel can be rapidly separated and recycled from a solid-liquid system, and no pollution is caused to the environment.

Description

Technical field:

[0001] The invention belongs to the field of material synthesis and radioactive wastewater treatment, and relates to a method for preparing polyamidoxime / graphene nanobelt composite airgel, separating and enriching uranium-containing wastewater. Background technique:

[0002] Uranium is an important nuclear fuel and one of the prerequisites for the development of nuclear power. In addition, uranium is also a potential radioactive poison. If it accumulates in a large amount in the environment, it will not only increase the background radiation of the environment, but also cause genetic variation of species due to its chemical toxicity, thus posing a potential threat to human survival and development. It should also be given great attention and corresponding measures should be taken. Therefore, the separation, enrichment and recovery of uranium from different uranium-containing aqueous media are of great significance for improving the utilization efficiency o...

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