Chemical Industry and Engineering Progree

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Adsorption kinetics and thermodynamics of β-cyclodextrin polymer microspheres for p-nitrophenol

LI Zhongjin,YANG Wei,LIU Yan,HAN Chunpeng,ZHAO Yan   

  1. Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry,Ministry of Education,Institute of Chemistry and Chemical Engineering,Shaanxi University of Science & Technology,Xi’an 710021,Shaanxi,China
  • Online:2010-11-05 Published:2010-11-05

β-环糊精微球吸附对硝基苯酚的动力学及热力学

李仲谨,杨 威,刘 艳,韩春鹏,赵 燕   

  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

Abstract:

β-Cyclodextrin polymerβ-CDPmicrospheres were synthesized from β-cyclodextrinβ-CDby inverse emulsion polymerization with epichlorohydrin as a crosslinking agent. Thermodynamic and kinetic characteristics as well as adsorption mechanism of β-CDP microspheres for p-nitrophenolp-NPfrom aqueous solution were investigated. Static adsorption isotherms at different temperatures illustrated that adsorption of p-NP on β-CDP microspheres reached a balance after 2h. The adsorption fitted with the first- and second-order dynamic equationsand the correlation coefficients were 0.9915 and 0.9998respectively. The Langmiur and the Freundlich adsorption isotherm equations were adapted for the adsorption characteristics of β-CDP microspheres for p-NP at temperatures of 298 K318 K and 338 K. The enthalpy changeΔH),free energy changeΔGand entropy changeΔSwere all negativeand the adsorption was a spontaneousendothermic and enthalpy promoting process.

摘要:

β-环糊精(β-CD)为原料,环氧氯丙烷(ECH)为交联剂,采用反相乳液法得到β-环糊精聚合物(β-CDP)微球,探讨了水溶液中β-CDP微球对对硝基苯酚(p-NP)吸附的动力学、热力学特性及其机理,绘制了不同温度下的吸附等温线。结果表明:β-CDP微球对p-NP的吸附2 h后基本达到平衡,且与一级吸附动力学模型和二级吸附动力学模型都有较好拟合,相关系数分别为0.99150.9998;在298 K318 K338 K温度下符合Langmiur方程和Freundlich 方程;吸附焓变(ΔH)、熵变(ΔS)和吉布斯函变(ΔG)均为负值,吸附是焓推动作用,自发且过程放热。

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