β-环糊精微球吸附对硝基苯酚的动力学及热力学  

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

作　　者：李仲谨[1] 杨威[1] 刘艳[1] 韩春鹏[1] 赵燕[1] 

机构地区：[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　　处：《化工进展》2010年第11期2134-2138,共5页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(50573046);陕西科技大学研究生创新基金资助项目

摘　　要：以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0.9915、0.9998;在298 K、318 K和338 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。β-Cyclodextrin polyme（rβ-CDP）microspheres were synthesized from β-cyclodextri（nβ-CD） by inverse emulsion polymerization with epichlorohydrin as a crosslinking agent.Thermodynamic and kinetic characteristics as well as adsorption mechanism of β-CDP microspheres for p-nitrophenol（p-NP）from 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 equations,and the correlation coefficients were 0.9915 and 0.9998,respectively.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 K,318 K and 338 K.The enthalpy chang（eΔH）,free energy chang（eΔG）and entropy chang（eΔS）were all negative,and the adsorption was a spontaneous,endothermic and enthalpy promoting process.

关 键 词：β-环糊精聚合物微球 吸附 对硝基苯酚 动力学 热力学 

分 类 号：O636[理学—高分子化学]