CTAB改性Cu-BTC材料的合成及其吸附分离二甲苯异构体的性能  

Synthesis of Cu-BTC modified by CTAB and its adsorption and separation of xylene isomers

作　　者：陈乐[1] 种海玲 张致慧[1] 何明阳[1] 陈群[1] CHEN Le;CHONG Hailing;ZHANG Zhihui;HE Mingyang;CHEN Qun(Laboratory of Green Catalysis and Technology of Jiangsu Province,College of Petrochemical Engineering,Changzhou University,Changzhou 213164,Jiangsu,China)

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

出　　处：《化工进展》2024年第1期455-464,共10页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(11775037,12175024);江苏省高等学校自然科学研究重大项目(21KJA530001);江苏省“青蓝工程”。

摘　　要：通过水热法合成Cu-BTC晶体的过程中添加十六烷基三甲基溴化铵(CTAB),通过调节CTAB的添加量对吸附材料的形貌和孔结构进行改性,改性后的Cu-BTC材料与原Cu-BTC相比,其对对二甲苯(PX)的静态吸附量明显提高,且高于间二甲苯(MX)和邻二甲苯(OX),从而提高了异构体的吸附选择性。研究了二甲苯异构体在Cu-BTC-CTAB材料上的静态吸附性能和吸附动力学性能。在298K、318K和338K温度下进行了一系列二甲苯有机蒸气吸附平衡实验,得到了静态吸附速率曲线和吸附等温线。改性材料中CTAB添加量为0.08%的Cu-BTC-CTAB样品对PX的吸附量和选择性最优。动力学研究表明,二甲苯异构体在Cu-BTC-CTAB上的吸附过程可以用一级动力学模型来描述。In this work,cetyltrimethylammonium bromide(CTAB)was added in the process of hydrothermal synthesis of Cu-BTC crystal,and the morphology and pore structure of the adsorbed material were modified by adjusting the addition amount of CTAB.Compared with the original Cu-BTC,the static adsorption capacity of the modified Cu-BTC material was significantly increased.It was higher than m-xylene(MX)and o-xylene(OX),which improved the adsorption selectivity of isomers.The static and kinetic properties of xylene isomers on Cu-BTC-CTAB adsorbent were systematically studied.A series of adsorption equilibrium experiments on xylene organic vapor were conducted at 298K,318K and 338K,and the static adsorption rate curves and adsorption isotherms were obtained.In the modified material,the adsorption capacity and selectivity of PX in Cu-BTC-CTAB sample with 0.08%CTAB were the best.Kinetic studies showed that the adsorption of xylene isomers on Cu-BTC-CTAB could be described by a pseudo-first-order kinetic model.

关 键 词：Cu-BTC CTAB改性 吸附分离 二甲苯异构体 

分 类 号：TQ424[化学工程] O6-339[理学—化学]