Preparation method of organic phosphinic acid functional group modified silicon-based adsorption material

Abstract

The invention relates to a preparation method of an organic phosphinic acid functional group modified silicon-based adsorption material. An organic phosphinic acid functional group is grafted on the surface of the silicon-based material, wherein R4 is an aliphatic substituent with the carbon atom number of 4-12. The method comprises the following steps: firstly, enabling a silicon-based material to react with a silane cross-linking agent with unsaturated carbon-carbon double bonds, grafting the carbon-carbon double bonds on the surface of the silicon-based material, and then grafting an organic phosphinic acid functional group to the surface of the silicon-based material by utilizing free radical addition reaction of the carbon-carbon double bonds and monoalkyl phosphinic acid, wherein R1 is a methyl group, an ethyl group or a beta-methoxyethyl group; R2 is a methyl group, a methoxy group, an ethyoxyl group or a beta-methoxy ethyoxyl group; and R3 is (CH2)n, n= 0-10, or is gamma-methacryloyloxy propyl. The prepared adsorption material is good in mechanical property, stable in chemical property, fast in adsorption kinetics and good in selectivity; the preparation method is simple and easy to implement, large-scale production is easy to achieve, and the grafting rate of organic phosphinic acid functional groups is high. The method can be used in the fields of low-concentration rare earth enrichment, rare earth separation, nuclear-grade zirconium and hafnium separation and the like.

Description

technical field

[0001] The invention belongs to the technical field of solid-phase extraction and separation, and in particular relates to the preparation of a functional group-modified silicon-based adsorption material and its application in low-concentration rare earth enrichment, rare earth separation, zirconium and hafnium separation, and the like. Background technique

[0002] Organophosphorus / phosphonic acid extractants are widely used in solvent extraction and separation of similar elements such as rare earth, nickel cobalt, zirconium and hafnium. Phosphate), P507 (mono-2-ethylhexyl 2-ethylhexylphosphate) and Cyanex 272 (di(2,4,4-trimethylpentyl)phosphinic acid). As the alkoxy group is replaced by the alkyl group, its acidity decreases in the order of P204>P507>Cyanex 272. The stronger the acidity, the stronger the ability to extract rare earth ions, cobalt nickel, zirconium and hafnium (extraction performance: P204>P507>Cyanex 272), but the separation pe...

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