凹凸棒土的改性及其对二甲苯异构体的吸附性能  

Modification of Attapulgite and Its Adsorption Performance for Xylene Isomers

作　　者：韶晖[1] 姚鹏飞[1] 钟璟[1] 陈乐[1] 姚超[1] 

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

出　　处：《石油学报（石油加工）》2014年第6期1016-1021,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金(21276029);江苏省自然科学基金基础研究计划(BK20131142);常州市科技创新基金(CC20120010)资助

摘　　要：采用酸化处理和十六烷基三甲基溴化铵对凹凸棒土(简称凹土)进行改性,利用N2吸附-脱附和FT-IR对所得凹土样品进行表征,并通过静态吸附实验研究了它们对二甲苯异构体的吸附行为,考察了初始质量分数、处理方式等对其吸附性能的影响。结果表明,凹土对二甲苯异构体的平衡吸附量随着异构体初始质量分数的增大而增大,相同条件下间二甲苯在凹土上的吸附量大于其他异构体;经过酸化处理和有机物改性后的凹土对二甲苯异构体的吸附性能优于原土,对间二甲苯的吸附量可达到74.06 mg/g。二甲苯异构体在凹凸棒土上的吸附符合Langmuir方程。Attapulgite was treated by acid and modified with hexadecyltrimethylammonium bromide to obtain alter-attapulgte.The attapulgite and modified attapulgite samples were characterized by FT-IR and BET.A static adsorption equilibrium experiment of C8 aromatics in liquid phase was carried out with the modified attapulgite samples as adsorbent,and the influences of C8 aromatics initial concentration and modification methods for attapulgite were investigated.The results showed that the equilibrium adsorption capacity of xylene on attapulgite increased with the increase of their initial concentration,and the equilibrium adsorption capacity of meta-xylene（MX）was the biggest among xylene isomers.The xylene had a higher adsorption capacity on attapulgite samples modified by acid and CTAB than on the unmodified attapulgite,while the maximum adsorption capacity of meta-xylene on the modified attapulgite was about 74.06mg/g.The adsorption behavior of xylene isomers on attapulgite was consistent with Langmuir isotherm equation.

关 键 词：凹土改性 二甲苯异构体 吸附性能 吸附动力学 

分 类 号：TQ424.21[化学工程]