摘要
以β-环糊精为原料,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）,并将其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∶1时,β-CDP对DPA的吸附性能最佳,此时的平衡吸附量为63.7 mg/g。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,吸附符合准二级动力学模型,可用Langmuir和Freundlich吸附等温模型描述。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β-CDP均能保持90%的吸附性能。
β-Cyclodextrin/epichlorohydrin copolymer（β-CDP） was synthesized in alkaline medium using β-cyclodextrin as monomer and epichlorohydrin as crosslinker and used as adsorbent for the adsorption of diphenolic acid（DPA） from the water solution. The influences of pH and mass ratio of β-CDP to DPA on the DPA adsorption were investigated. The results showed that the adsorption efficiency for DPA was fairly good when the pH was less than 4.3 and the equilibrium adsorption capacity was 63.7 mg/g when the mass ratio of β-CDP to DPA was 12.5∶1. At the same time, the adsorption mechanism of β-CDP for DPA was discussed. A rapid adsorption rate for the removal of DPA onto β-CDP from water solution was achieved, and the adsorption process was mainly due to hydrogen bond and hydrophobic interaction. The adsorption kinetics agreed with the pseudo second-order kinetic model. The isothermal adsorption process was well described by Langmuir and Freundlich models. The thermodynamic study revealed that the adsorption process was spontaneous and exothermic in nature. The β-CDP had good regeneration performance, especially the adsorption capacity of β-CDP remained 90% of the initial adsorption capacity for DPA after five cycles of adsorption-desorption.
作者
林壮
王锐
宫红
姜恒
LIN Zhuang;WANG Rui;GONG Hong;JIANG Heng(College of Chemical and Material Science,Liaoning Shihua University,Fushun 113001,Liaoning,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2018年第10期1719-1723,共5页
Fine Chemicals
基金
辽宁省自然科学基金资助项目(201202122)~~
关键词
β-环糊精/环氧氯丙烷共聚物
双酚酸
吸附
再生
水处理技术与环境保护
β-cyclodextrin/epichlorohydrin copolymer
diphenolic acid
adsorption
regeneration performance
water treatment technology and environmental protection
