Anion-cation double exchange type copper (II) ion surface imprinted polymer and preparation method thereof

Abstract

The invention provides polystyrene-supported anion-cation double exchange type copper (II) ion surface imprinted polymer which is prepared by performing copolymerization with skeleton monomers on polyenoic allyl ammoniated polystyrene surfaces by taking an unsaturated quaternary ammonium cation-modified sulfated aldoxime copper (II) complex as a functional monomer and polyenoic allyl ammonium saltas a cross-linking agent; the polymer can be used as solid-phase blotting bi-site extractant for copper (II) to perform selective enrichment and separation of copper (II) ions in various aqueous systems; the polymer has the function and characteristic of simultaneously extracting counter-anions and can be used in methods for removing the copper (II) ions in the various aqueous systems and methodsfor detecting, and separating and enriching the copper (II) ions in the various aqueous systems in an auxiliary manner; and the anion-cation double exchange type copper (II) ion imprinted polymer canbe in forms of foam, diaphragm plates, fibrils or particles.

Description

technical field [0001] The present invention relates to an imprinted polymer, in particular to an anion-cation double-exchanged copper (II) ion surface imprinted polymer, which uses unsaturated quaternary ammonium cation-modified salicylaldoxime copper (II) complexes as functional monomers , using polyallyl ammonium salt as a cross-linking agent, prepared by copolymerization with backbone monomers on the surface of polyallyl ammonium polystyrene, as a solid-phase imprinted double-position extraction of copper (II) The agent is used for the selective enrichment and extraction and separation of copper (II) ions in various water systems, has the function and characteristics of simultaneously extracting counter anions, and belongs to the field of functional polymer materials. Background technique [0002] Most of the extraction and separation of copper (II) ions in water systems nowadays use liquid-liquid extractant 5-alkyl salicylaldoxime and its complexes. The copper-iron sepa...

AI Technical Summary

Problems solved by technology

But the weak point of 5-alkyl salicylaldoxime is that when 5-alkyl salicylaldoxime copper (II) chelate concentration is higher, precipitation occurs easily; The problem of a small amount of emulsions and the long separation time of oil-water two-phase chromatography lead to complex and changeable hydrometallurgy process control, harsh production environment, and serious waste pollution.

The ionic bond and coordinate bond between the polymerizable ligand or chelating ligand and the transition metal ion have stronger forces than hydrogen bonds, van der Waals forces, electrostatic interactions, hydrophobic interactions, etc., and the spatial structure is stable. Strong chelation orientation is conducive to the preparation of imprinted polymers with high selectivity and stable imprinting function; the recognition process through coordination has the advantages of fast and reversible binding; the metal ion and ligand or chelating ligand Coordination has good thermodynamic stability, it is relatively easy to achieve dynamic equilibrium, and has a wide range of applications; however, since most of the crosslinking agents used are ethylene glycol diacrylate or bisacrylamide methane, etc. The material is prone to hydrolysis reaction in the acid-base aqueous solution, causing the ion-imprinted polymer material to lose its proper stability and cannot be recycled for a long time

At the same time, ion-imprinted polymer materials have fewer imprinted sites, ion-imprinted particles have deep pores, and the diffusion resistance of template ions close to the recognition site is large, which prolongs the equilibrium ion exchange time of ion-imprinted polymer materials.

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