Selective removal of phenol by spherical particles of α-, β- and BoldItalic-cyclodextrin polymers: kinetics and isothermal equilibrium

Qingchuan CHEN, Yicun WEN, Yu CANG, Li LI, Xuhong GUO, Rui ZHANG

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PDF(552 KB)
Front. Chem. Sci. Eng. ›› 2013, Vol. 7 ›› Issue (2) : 162-169. DOI: 10.1007/s11705-013-1318-5
RESEARCH ARTICLE

Selective removal of phenol by spherical particles of α-, β- and BoldItalic-cyclodextrin polymers: kinetics and isothermal equilibrium

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Abstract

Spherical particles of α-, β- and γ-cyclodextrin (CD) polymers to efficiently remove phenol from waste water were prepared by reverse suspension polymerization with epichlorohydrin as crosslinker in liquid paraffin. By controlling the amounts of crosslinker and water, well-defined spherical polymer particles with controllable size were obtained. Due to the selective inclusion associations between CD groups and phenol, these CD spherical polymer particles were demonstrated to be ideal candidates for removal of phenol. Among them β-CD polymer particles showed the best performance. The kinetics and isothermal equilibrium models were used to fit the experimental data of phenol removal from aqueous solution using these CD polymer particles. It was found that the kinetics followed the Ho and Mckay equation, suggesting that the adsorption process of phenol was controlled by diffusion and the host-guest interaction between CD and phenol. Equilibrium isothermal data can be well fitted by the Freundlich equation. The negative free energy change indicated the spontaneous nature of adsorption of phenol by α-, β- and γ-CD spherical polymer particles, while the lowest free energy for β-CD polymer reflected its best adsorption ability, compared to α- and γ-CD polymer particles.

Keywords

cyclodextrin polymer particles / phenol / kinetic models / adsorption isotherm equilibrium models

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Qingchuan CHEN, Yicun WEN, Yu CANG, Li LI, Xuhong GUO, Rui ZHANG. Selective removal of phenol by spherical particles of α-, β- and BoldItalic-cyclodextrin polymers: kinetics and isothermal equilibrium. Front Chem Sci Eng, 2013, 7(2): 162‒169 https://doi.org/10.1007/s11705-013-1318-5

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Acknowledgements

We gratefully acknowledge the National Natural Science Foundation of China (Grant No. 21004021), the Fundamental Research Funds for the Central Universities (WA1014007), Chemical Engineering National Key Laboratory Open Subject SKL-ChE-11CO2, the Start Funding of East China University of Science and Technology YA0142119 for support this work.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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