Preparation method of magnetic lead ion surface imprinting polymer

Abstract

The invention discloses a preparation method of a magnetic lead ion surface imprinting polymer. The method comprises the following steps: firstly, synthesizing magnetic Fe3O4@SiO2 microspheres by using a 'coprecipitation method' and a 'sol-gel method', processing by using an acid, so as to improve the hydroxy content of the surface; then leading polymerizable double bonds to the surfaces of the Fe3O4@SiO2 microspheres by using a 'two-step process', firstly, grafting amino on the surfaces of the microspheres by using an amino silane coupling agent; generating double bonds by using reaction of anhydride and amino; finally taking the Fe3O4@SiO2 microspheres as a carrier, the Pb(II) as a template, ethylene glycol dimethacrylate as a crosslinking agent and methacrylic acid and salicylaldoxime as monomers to carry out polymerization reaction; and washing off the template Pb(II) after reaction is ended, so as to obtain a polymer layer with a lot of Pb(II) imprinting cavities distributed at the surfaces of the Fe3O4@SiO2 microspheres. The magnetic lead ion surface imprinting polymer disclosed by the invention can be applied to separation and removal of lead ions.

Description

technical field [0001] The invention relates to a preparation method of a magnetic lead ion surface imprinted polymer, in particular to a lead ion surface imprinted polymer with a core-shell structure and magnetic properties. Background technique [0002] Lead is mainly used as materials for cables, storage batteries, type alloys, X-ray and β-ray protection, etc. Lead alloys can be used for type casting and soldering. In recent years, with the rapid development of my country's industry, lead pollution has become increasingly serious and has become a major public hazard affecting human health. The acceptable maximum lead concentration in drinking water is 0.1-0.05mg / L. According to surveying and measuring, when blood lead concentration in the human body exceeds 0.3g / L, symptoms such as dizziness, insomnia, anemia and abdominal pain will occur. Therefore, it is of great significance to study the separation and removal of lead. At present, the common treatment methods includ...

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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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