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

• 基础研究 • 上一篇    下一篇

β-环糊精聚合物微球对Zn2+的吸附行为及机理

李仲谨,杨 威,刘 艳,赵 燕,李健基   

  1. 陕西科技大学化学与化工学院,教育部轻化工助剂化学与技术重点实验室
  • 收稿日期:2010-03-31 修回日期:2010-12-13 出版日期:2011-01-15 发布日期:2010-12-28
  • 通讯作者: 李仲谨 E-mail:lizhj@sust.edu.cn
  • 基金资助:

    国家自然科学基金项目(50573046);陕西科技大学研究生创新基金项目

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

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

  1. 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

摘要:

以β- 环糊精为原料,环氧氯丙烷为交联剂,采用反相乳液聚合得到一种交联β- 环糊精聚合物(β-CDP)微球,研究其对Zn2+ 的静态吸附行为,测定吸附等温线,分析吸附热力学性质和动力学特征,并用红外光谱仪、X 射线衍射仪和综合热重仪对β-CDP 微球吸附Zn2+ 前后对照分析,探讨吸附机理。结果表明:在实验条件范围内,β-CDP 微球对Zn2+ 吸附等温线同时符合Langmuir 等温方程和Freundlich 等温方程;在不同温度下,β-CDP 微球吸附Zn2+ 的吸附焓变(ΔH)、熵变(ΔS)、吉布斯自由能(ΔG)均为负值,吸附是自发的放热过程;β-CDP 微球主要通过物理吸附和配位吸附等方式吸附Zn2+,这些吸附作用增强了交联链的热稳定性、破坏了β-CDP 微球的结晶结构。

关键词: β-环糊精聚合物微球, Zn2+, 吸附机理, 动力学

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

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