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.