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Abstract: Cadmium(II) ion imprinted polymer microspheres (IIPs) were synthesized by seedball swelling suspension polymerization in aqueous system, using polystyrene emulsion as seedball, cadmium(II) ion as template, α-benzoin oxime as functional monomer and ethylene glycol dimethacrylate (EGDMA) as cross-linker. The interaction between cadmium(II) and α-benzoin oxime of cadmium(II) IIPs were investigated by UV spectroscopy and Fourier transform infrared spectroscopy (FT-IR) and then the optimal ratio of the two was acquired. In addition, the microstructure of the prepared IIPs was observed by scanning electron microscopy (SEM). Equilibrium adsorption and isothermal adsorption experiments were carried out to investigate the cadmium(II)-adsorption ability of the prepared IIPs. The results indicate that there existed interaction between the template and the monomer, and the best ratio of the two is 1:2. The IIPs showed good dispersibility with uniform size distribution, which exhibited high adsorption and good specific selectivity to cadmium(II) for the solutions with pH 6. The IIPs could be used to effectively extract cadmium(II) from aqueous solutions.
Template and target information: cadmium ion, Cd(II)
Author keywords: organic polymer materials, ion imprinted polymer microspheres, seedball swelling suspension polymerization, Cadmium(II), selectivity adsorption