Preparation method of magnetic zinc ion surface-imprinted polymer

Abstract

The invention relates to a preparation method of a magnetic zinc ion surface-imprinted polymer, which comprises the following steps: synthesizing magnetic Fe3O4@SiO2 microspheres by a coprecipitation process and a sol-gel process, and treating with acid to enhance the surface hydroxy content; introducing a polymerizable double bond onto the surface of the Fe3O4@SiO2 microspheres by a two-step process, i.e. grafting amino group onto the microsphere surface by using an aminosilane coupling agent, and reacting acid anhydride with the amino group to generate the double bond; and finally, carrying out polymerization reaction by using the Fe3O4@SiO2 microspheres as a carrier, Zn (II) as a template, ethylene glycol dimethacrylate as a crosslinking agent and methacrylic acid and salicylaldoxime as monomers, and after the reaction finishes, washing out the template Zn (II) to obtain the polymer layer in which abundant Zn (II) imprinted holes are distributed on the Fe3O4@SiO2 microsphere surface. The magnetic zinc ion surface-imprinted polymer can be used for separating and removing zinc ions.

Description

technical field [0001] The invention relates to a preparation method of a magnetic zinc ion surface imprinted polymer, in particular to a magnetic zinc ion surface imprinted polymer with a core-shell structure. Background technique [0002] Zinc is the fourth "most common" metal, after iron, aluminum and copper. In modern society, zinc is mainly used in metallurgy, machinery, chemical industry, light industry, medicine and military and other fields. Although zinc is an essential element for animals and plants, when the concentration of zinc exceeds 300mg / L, it can cause zinc poisoning in animals and affect the photosynthesis of plants. Therefore, the study on the separation and removal of zinc is of great significance. At present, the common treatment methods include ion exchange method, membrane separation method, chemical precipitation method and adsorption method, etc., and the adsorption method is considered to be an efficient and economical method. The specific recog...

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Problems solved by technology

[0004] The above methods usually have the following problems: (1) Generally, the magnetic imprints synthesized are based on Fe 3 o 4 As the core, a layer of SiO is coated on the outside 2 , and then using SiO 2 The hydroxyl groups on the surface are directly grafted with functional monomers, or undergo silanization and related subsequent reactions to synthesize imprinted materials

But SiO 2 The hydroxyl content on the surface is limited, which will affect the grafting rate of functional monomers or the effect of silane coupling agent surface modification

(2) Grafting polymerizable double bonds on the outer layer of the carrier, mostly using γ-(methacryloyloxy)propyltrimethoxysilane to introduce double bonds (Zhang Shuanhong, Sun Changmei, Qu Rongjun. Surface molecules (ions) Advances in the preparation and performance of imprinted silica gel / polymer. Polymer Bulletin, 2010(4):17-29.), but it is thermally unstable, under conventional silanization conditions (110°C toluene as solvent for reflux ) will undergo thermal polymerization, but if the temperature is lowered, the efficiency of the introduction of double bonds will be reduced

However, the rigidity of methacrylic acid is not good, and the rigidity of the synthesized imprinted holes is small, which affects the reuse performance

(4) In the reported literature and patents, the adsorbent is often used alone for the adsorption of trace or trace ions, which limits the scope of use of the adsorbent

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