Preparation method of ion-imprinted blended membrane

Abstract

The invention relates to a preparation method of an ion-imprinted blended membrane. The method comprises steps as follows: (1) synthesis of a macromolecular chain transfer agent: the macromolecular chain transfer agent is synthesized from methyl methacrylate and an RAFT reagent in a preset proportion of a thermal initiator; (2) synthesis of an amphiphilic block functional copolymer: the amphiphilic block functional copolymer is synthesized from 4-vinylpyridine, the thermal initiator and the macromolecular chain transfer agent synthesized in the step (1); (3) synthesis of a template ion-high-polymer complex; (4) membrane casting: the template ion-high-polymer complex in the step (3) and a membrane matrix are dissolved in a solvent in a preset proportion and stirred for preset time to be uniformly mixed, a membrane casting solution is obtained, and membrane casting is performed after bubbles are removed from the membrane casting solution; (5) elution. In the membrane forming process, a hydrophilic block can rapidly move to the surface of the membrane, the condition of difficulty in elution due to too deep embedding of template ions by PVDF (polyvinylidene fluoride) can be avoided, more binding sites are produced on the surface of the membrane, and the adsorption selectivity and the adsorption capacity of the ion-imprinted blended membrane are increased.

Description

technical field [0001] The invention belongs to the technical field of ion imprinting, and in particular relates to a preparation method of an ion imprinting blend membrane. Background technique [0002] Molecular (ion) imprinted membrane refers to a type of membrane that contains or is composed of molecularly imprinted polymers. The purpose of molecular recognition is achieved through the memory recognition performance of polymers on template molecules. Its molecular space recognition ability is strong and high-selectivity separation can be achieved. The basic idea is to add imprinted molecules into the polymerization medium, remove the imprinted molecules after film formation, and leave holes matching the size of the imprinted molecules in the network structure of the imprinted polymer layer, and the gap between the imprinted film and the imprinted molecules When it is used to separate the mixture composed of imprinted molecules and other substances, the imprinted membrane...

AI Technical Summary

Problems solved by technology

Moreover, the prepared imprinted blend membrane usually has the phenomenon that template molecules (ions) are embedded too deeply by the membrane matrix and are not easy to elute, which will greatly reduce the adsorption capacity and adsorption rate of the imprinted blended membrane.

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