凹凸棒土对戊醇异构体吸附分离性能的研究  

MODIFICATION OF ATTAPULGITE AND ITS ADSORPTION PERFORMANCE OF PENTANOL ISOMERS

作　　者：韶晖[1] 解丹燕 姚鹏飞[1] 冷一欣[1] 王俊[1] 姚超[1] 

机构地区：[1]江苏省绿色催化材料与技术重点实验室常州大学石油化工学院,常州213164

出　　处：《离子交换与吸附》2015年第6期522-530,共9页Ion Exchange and Adsorption

基　　金：江苏省产学研前瞻性联合研究项目(BY2014037-15)

摘　　要：采用十六烷基三甲基溴化铵和β-环糊精对凹凸棒土进行改性,研究了凹凸棒土对戊醇异构体的吸附行为。实验结果表明,相同条件下正戊醇在凹凸棒土上的吸附量大于2-甲基-丁醇。以环己烷为溶剂,十六烷基三甲基溴化铵改性后的凹凸棒土对戊醇异构体的吸附量较大,但吸附分离性能较差;而β-环糊精改性的凹凸棒土对戊醇异构体有较好的吸附分离性能,吸附选择性和分离因子分别为92.24和12.16。Langmuir方程拟合呈现出了良好的线性关系,戊醇异构体在凹凸棒土上的吸附等温线符合二级动力学方程模型。Attapulgite was reacted with hexadecyltrimethylammonium bromide(CTAB) or β-cyclodextrin(β-CD) to obtain organic compound-modified attapulgite. Adsorption behavior of pentanol on the modified attapulgite adsorbents was studied and the results showed that the adsorption capacity of 1-pentanol was more than that of 2-methyl-2-butanol under the same experimental conditions. With cyclohexane as solvent,the attapulgite modified by CTAB had higher adsorption capacity of pentanol,but the separation properties were poor. Pentanol isomers on attapulgite modified by β-cyclodextrin had better adsorption and separation capacity. The adsorptive selectivity and separation factor were 92.24 and 12.16,respectively. The adsorption data was well fitted to Langmuir isotherm model. The isotherms of pentanol isomers on attapulgite were consistent with Pseudo-second-order equation.

关 键 词：戊醇异构体 凹凸棒土改性 吸附分离 吸附动力学 

分 类 号：O647.3[理学—物理化学]