化工进展

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交联淀粉微球对对羟基苯甲醚的吸附行为及机理的探讨

苏秀霞,赵钤妃,李仲谨,景 洁,支娟娟   

  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,陕西 西安 710021
  • 出版日期:2011-09-05 发布日期:2011-09-05

Adsorption behavior and mechanism of crosslinked starch microspheres for p-hydroxyanisole

SU Xiuxia,ZHAO Qianfei,LI Zhongjin,JING Jie,ZHI Juanjuan   

  1. Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry,Ministry of Education,College of Chemistry and Chemical Engineering,Shaanxi University of Science & Technology,Xi’an 710021,Shaanxi,China
  • Online:2011-09-05 Published:2011-09-05

摘要:

以可溶性淀粉为原料,通过反相悬浮聚合法,合成了一种交联淀粉微球(CSM)。研究了CSM对羟基苯甲醚的吸附行为,分析了其吸附动力学特性和热力学性质,并利用扫描电子显微镜(SEM)、傅里叶红外光谱仪(FTIR)和X射线衍射仪对淀粉微球及其吸附产物进行了表征,探讨其吸附机理。结果表明:在研究范围内,CSM对对羟基苯甲醚的吸附行为同时符合LangmuirFreundlich等温吸附方程;在不同温度下,CSM吸附对羟基苯甲醚的吸附焓变(ΔH)、吸附熵变(ΔS)、吸附自由能变(ΔG)均为负值,吸附是一个自发、放热过程。

Abstract:

The crosslinked starch microspheresCSMwere synthesized from soluble starch by inverse suspension polymerization. The adsorption behavior of CSM for p-hydroxyanisole was investigated. The kinetics and thermodynamics characteristics were also studied. The structures of CSM before and after adsorption were characterized by particle size analyzerscanning electron microscopeFT-IR spectroscopy and X ray diffractionXRD),and the mechanism of adsorption was also discussed. Within the framework of the studythe adsorption characteristics of CSM for p-hydroxyanisole obeyed the Langmiur and Freundlich adsorption isotherm equations. The enthalpy change ΔHentropy change ΔS and free energy change ΔG for p-hydroxyanisole adsorbed by CSM were all negative at different temperatures. The adsorption was a spontaneous and exothermic process.

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