A separation material for separating thorium and uranium in aqueous solution and its preparation method

Abstract

The invention discloses a separating material for separating thorium and uranium in water solution and a preparation method of the separating material. The separating material is SiO2-APTMS-DMAP (aminopropyltrimethoxysilane-dimethylaminopyridine). Firstly, silicon dioxide pellets are activated by sulfuric acid and hydrogen peroxide mixed solution. Secondly, methylene dichloride serves as a solvent, and 3-aminopropyltriethoxysilane, triethylamine and di(dimethylamino) phosphorus chlorate are added and subjected to amidation to prepare an APTMS-DMAP ligand. Finally, the activated silicon dioxidepellets and the APTMS-DMAP ligand are added, methylbenzene serves as a solvent and flows back, methylbenzene and ethyl alcohol washing is performed, and then vacuum drying is performed to prepare theSiO2-APTMS-DMAP for separating thorium and uranium in the water solution. The separating material has strong selective ligancy for thorium ions in the water solution, can selectively capture the thorium ions, and is high in thorium ion adsorption capacity, good in stability, strong in interference resistance and good in separating effect. The preparation method has the advantages of low cost, wide applicable range, good selectivity, high adsorption efficiency, recyclability and the like.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel, and in particular relates to a separation material for separating thorium and uranium in an aqueous solution and a preparation method thereof. Background technique [0002] Thorium is a radioactive metal element with gray luster, soft texture and active chemical properties. Thorium is widely distributed in the earth's crust, and the reserves of thorium in nature are more than three times that of uranium. 232 Th can be transformed into 233 U, so it is a promising energy material. Therefore, it is very important to realize the separation of thorium and uranium, such as preparing high-purity thorium or removing thorium from a large amount of uranium. [0003] At present, the separation methods of thorium and uranium mainly include solvent extraction, ion exchange, adsorption separation (including solid-phase adsorption), extraction chromatography, foam flotation, precipitation, electrodeposi...

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Problems solved by technology

Chen Yanliang et al [ChenYanliang, Wei Yuezhou, et al. Separation of thorium and uranium in nitricacid solution using silica based anion exchange resin. Journal of Chromatography A, 2016, 1466, 37-41] studied the synthesis of porous silica as a substrate Anion exchange resin SiPyR-N4 for the separation of thorium from uranium in 9M HNO 3 Under this condition, thorium and uranium were successfully separated by column chromatography experiments. The disadvantage of this method is that it needs to be carried out at a higher concentration of nitric acid

Srivastava Bhavya et al. [Srivastava Bhavya, K.Barman Milan, et al. Solid phase extraction, separation and preconcentration of rare elements thorium(IV), uranium(VI), zirconium(IV), cerium(IV) and chromium(III) amid several other foreign ions with eriochrome black Tanchored to 3-D networking silica gel. Journal of Chromatography A, 2016,1451, 1-14] studied the 3D networked silica gel FSG-EBT immobilized with chrome black T, solidified Phase adsorption, extraction, and enrichment of metal elements such as thorium, uranium, and cerium. The material can form stable complexes with different metal ions at different pHs, and the adsorption effect is good, but the preparation of the material is relatively complicated.