Highly selective magnetic polymer particles via molecular imprinting

Xiaobing Wang; Guihua Qiu; Yi Ge; Wei Zheng; Lingmei Kong; Yajuan Xue; Bin Ren; Yuxing Peng

Korean Journal of Chemical Engineering, Vol.32, No.11, 2355-2360, November, 2015

DOI10.1007/s11814-015-0055-5 Export Citation

Highly selective magnetic polymer particles via molecular imprinting

Xiaobing Wang, Guihua Qiu^†, Yi Ge¹, Wei Zheng, Lingmei Kong, Yajuan Xue, Bin Ren, and Yuxing Peng²

Shandong Institute of Nonmetallic Materials, China North Industries Group Corporation, Jinan, Shandong, P. R. China
¹School of Aerospace, Transport and Manufacture, Cranfield University, Bedfordshire, U.K., UK
²Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, Sichuan, P. R. China

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Magnetic hydrophilic molecularly imprinted polymer (MIP) particles were successfully synthesized via an inverse suspension polymerization in silicone oil, by employing methacryloxypropyltrimethoxysilane(MPS)-modified Fe3O4 nanoparticles as magnetic particles, 2,4-dichlorophenoxyacetic acid (2,4-D) as template, hydroxyethyl methacrylate (HEMA) as hydrophilic monomer, and acetonitrile as high polar porogen. The synthesized magnetic hydrophilic MIP particles could be separated rapidly under an external magnetic field. About 94% transmittance of the particlewater suspension could be reached within 20 min by magnetic separation, whereas about 84% transmittance was achieved after at least 180min by sedimentation. The adsorption capacity of the particles was also studied in pure aqueous environments. These hydrophilic MIP particles had a higher selectivity for templates. Hydrophilic MIP particles took on a higher imprinting factor than hydrophobic MIP particles and 2,4-D were able to rebind hydrophilic MIP particles more easily than 4-Chorophenoxyacetic acid.

Keywords:Molecular Imprinting;Magnetic Particles;Suspension Polymerization;Hydrophilic Particles;Selectivity

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