Adsorption Behavior and Mechanism of Zinc (II) on β-Cyclodextrin Polymer Microspheres

doi:10.7506/spkx1002-6630-201101009

FOOD SCIENCE ›› 2011, Vol. 32 ›› Issue (1 ): 35-38.doi: 10.7506/spkx1002-6630-201101009

• Basic Research • Previous Articles Next Articles

Adsorption Behavior and Mechanism of Zinc (II) on β-Cyclodextrin Polymer Microspheres

LI Zhong-jin，YANG Wei，LIU Yan，ZHAO Yan，LI Jian-ji

Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, College of Chemistry and
Chemical Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China

Received:2010-03-31 Revised:2010-12-13 Online:2011-01-15 Published:2010-12-28
Contact: LI Zhong-jin E-mail:lizhj@sust.edu.cn

Abstract

Abstract:

The static adsorption behavior of Zn2+ on β-cyclodextrin polymer (β-CDP) microspheres prepared by crosslinking of β-cyclodextrin with epichlorohydrin and subsequent reversed-phase emulsion polymerization was investigated, and the isothermal adsorption curves and the adsorption thermodynamics and kinetics characteristics were measured at different temperatures. Meanwhile, structural changes in β-CDP microspheres before and after Zn2+ adsorption were examined through FT-IR spectroscopic and X-ray diffraction (XRD) observations and thermogravimetric analysis (TGA), and the adsorption mechanism was also discussed. The results showed that the adsorption of Zn2+ on β-CDP microspheres complied with both Langmuir and Freundlich isotherm adsorption equations. The enthalpy change (ΔH), entropy change (ΔS) and free energy change (ΔG) for Zn2+ adsorbed by β-CDP microspheres at different temperatures were all negative, meaning that the adsorption of Zn2+ on β-CDP microspheres is a spontaneous and exothermic process. β-CDP microspheres adsorbed Zn2+ mainly through physical adsorption, coordination adsorption, and so on, which could enhance the thermostability of crosslinked chains and damage the crystal structure of β-CDP microspheres.

Key words: β-cyclodextrin polymer microspheres, Zn2+, adsorption mechanism, kinetics

CLC Number:

TS207.3

LI Zhong-jin，YANG Wei，LIU Yan，ZHAO Yan，LI Jian-ji. Adsorption Behavior and Mechanism of Zinc (II) on β-Cyclodextrin Polymer Microspheres[J]. FOOD SCIENCE, 2011, 32(1 ): 35-38.

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Adsorption Behavior and Mechanism of Zinc (II) on β-Cyclodextrin Polymer Microspheres

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