Seawater uranium extraction adsorbent capable of self-renewing active antifouling coating and preparation method thereof

Abstract

The invention discloses a preparation method of an adsorbent for extracting uranium from sea water capable of self-renewing active antifouling coatings, comprising the following steps: preparing zinc nitrate hexahydrate-polyacrylonitrile spinning precursor by using polyacrylonitrile and zinc nitrate hexahydrate solution; spinning under certain conditions to prepare zinc nitrate hexahydrate-polyacrylonitrile fiber; take zinc nitrate hexahydrate-polyacrylonitrile fiber and add 2-methylimidazole solution to react to obtain 2-methylimidazole zinc salt porous coordination polymerization 2-methylimidazole zinc salt porous coordination polymer-zinc nitrate hexahydrate-polypropylene composite fiber obtained by cross-linking the composite fiber with tannic acid; finally carrying out oximation reaction to obtain Amidoximated nanoscale composite fiber material for seawater uranium extraction. The seawater uranium extraction adsorbent prepared by the method can not only significantly improve its uranium extraction capacity, but also has continuous self-renewal anti-marine biofouling ability in the use of circular uranium extraction, does not shrink and has a stable structure.

Description

technical field [0001] The invention relates to the field of new material preparation, in particular to a seawater uranium-extracting adsorbent capable of self-renewing active antifouling coating and a preparation method thereof. Background technique [0002] Extracting uranium from seawater is essential to meet the growing demand for uranium resources from the nuclear energy industry. However, due to the complex environment of natural seawater, the concentration of uranium is low (3.3ppb, μg L -1 ) and serious marine microbial fouling, resulting in the failure of the uranium extraction adsorbent to be widely used industrially. [0003] As one of the adsorbents for extracting uranium, fiber materials doped with metal-organic framework nanoparticles are usually modified before being used for extracting uranium from seawater, such as nitrile oximation or lye treatment, so as to increase the adsorption sites of uranium and improve The hydrophilicity of the fibers thus facilit...

AI Technical Summary

Problems solved by technology

When the fiber is used to extract uranium from seawater, due to the scour of the fiber by seawater circulation and the damage to the fiber by elution and regeneration after the fiber absorbs uranium, the modification and elution will simultaneously cause a large amount of metal-organic framework nanomaterials on the fiber to fall off and the fiber Different degrees of shrinkage or degradation (related to solution type, concentration, pH, treatment time, temperature and other factors) affect the surface morphology and structural strength of the fiber, resulting in a serious decline in uranium adsorption efficiency and material durability

In addition, a large number of marine bacteria will wrap the bacterial community through the extracellular matrix secreted by themselves, thereby forming an organized bacterial aggregate film (microbial film) attached to the surface of the adsorption material, which provides diatoms and megaspores Nutrients and fixed points are one of the important factors causing marine biofouling, which seriously affect the adsorption efficiency of seawater uranium extraction materials

At present, there are few studies on fiber adsorbent materials with anti-biofilm and anti-algae adhesion functions, and the adsorption efficiency of seawater uranium extraction materials with anti-biofouling properties is generally low

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