β-环糊精交联树脂的合成及对双酚酸的吸附性能

Synthesis of β-Cyclodextrin Crossing Resins and Its Adsorption Properties for Diphenolic Acid

摘要:

摘要：以环氧氯丙烷为交联剂在碱性条件下合成β-环糊精/环氧氯丙烷共聚物（β-CDP），并用于吸附水溶液中的双酚酸（DPA）。考察了pH及β-CDP与DPA的质量比对吸附的影响，结果表明当pH≤4.3时，有利于β-CDP对DPA的吸附，且当β-CDP与DPA的质量比为12.5时β-CDP对DPA的吸附性能最佳，同时分析了β-CDP吸附DPA的机理。β-CDP对DPA的吸附速率很快，吸附过程主要受氢键和疏水作用影响，吸附动力学符合准二级动力学模型，可用Langmuir和Freundlich吸附等温模型很好的描述。β-CDP对DPA的吸附具有热力学可行性和自发性，吸附过程放出热量。β-CDP再生性能良好，经过5次吸附-解吸循环实验，每次均能保持β-CDP 90%的吸附性能。

Abstract:

Abstract：β-Cyclodextrin/epichlorohydrin copolymer(β-CDP) was synthesized in alkaline medium using β-cyclodextrin as monomer and epichlorohydrin as crosslinker. β-CDP was used as adsorbent for the adsorption of diphenolic acid (DPA) from the water solution. The influence of pH and β-CDP to DPA mass ratio for the DPA adsorption was investigated. The results showed that the adsorption efficiency was fairly good when the pH was less than 4.3 and the mass ratio of β-CDP to DPA was 12.5. At the same time, the mechanism of β-CDP adsorption for the DPA was discussed. β-CDP had a rapid adsorption rate for the removal of DPA from water solution, the hydrogen bond and hydrophobic interaction had important effort on the adsorption process. The adsorption kinetics agreed with the pseudo second-order kinetic model. Langmuir and Freundlich isotherm models were well described. The thermodynamic experiment was spontaneous and exothermic in nature. β-CDP had good regeneration performance, the adsorption capacity of β-CDP was 90% after five cycles of adsorption-desorption.