Preparation of Cadmium(II) Ion Imprinted Polymer Microspheres by Seedball Swelling Suspension Polymerization

doi:10.11901/1005.3093.2015.488

Chinese Journal of Materials Research

2016, Vol. 30

Issue (9): 669-674 DOI: 10.11901/1005.3093.2015.488

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Preparation of Cadmium(II) Ion Imprinted Polymer Microspheres by Seedball Swelling Suspension Polymerization

Zhichun SUN,Bing WANG,Juanjuan SHAN

State Key Laboratory of Separation Membranes and Membrane Processes (Tianjin Polytechnic University), School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China

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Zhichun SUN,Bing WANG,Juanjuan SHAN. Preparation of Cadmium(II) Ion Imprinted Polymer Microspheres by Seedball Swelling Suspension Polymerization. Chinese Journal of Materials Research, 2016, 30(9): 669-674.

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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.

Key words: organic polymer materials ion imprinted polymer microspheres seedball swelling suspension polymerization cadmium(II) selectivity adsorption

Received: 04 December 2015

Fund: *Supported by Nature Science Foundation of Tianjin No13JCQNJ C02600

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.488 OR https://www.cjmr.org/EN/Y2016/V30/I9/669

Fig.1 UV adsorption spectras of Cd²⁺ and α-benzoin oxime system in methanol solution

Fig.2 Infrared spectras of polymers (a) NIPs; (b) IIPs after adsorption; (c) IIPs before elution

Fig.3 Scanning Electron microscope images of polymers

Fig.4 Effect of pH on the adsorption

Fig.5 Adsorption dynamic curves of polymer microspheres

Fig.6 Second-order-kinetics of IIPs and NIPs

Fig.7 Adsorption isotherm of imprinting molecule on IIPs and NIPs

Table 1 Values of K and α of different substrates on IIPs and NIPs

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