羧甲基-β-环糊精/磁性介孔硅对Pb2+的吸附研究  

Adsorption of Pb2+ by Carboxymethyl-β-Cyclodextrin/Magnetic Mesoporous Silica

作　　者：李柏林[1,2] 陈泽智 刘子国 李晔 杨琴[1] LI Bolin;CHEN Zezhi;LIU Ziguo;LI Ye;YANG Qin(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Mine Environmental Pollution Control&Remediation,Hubei Polytechnic University,Huangshi 435003,China)

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070 [2]湖北理工大学湖北省环境污染控制与修复重点实验室,湖北黄石435003

出　　处：《环境科学与技术》2019年第10期113-121,共9页Environmental Science & Technology

基　　金：国家重点研究发展计划（2016YFC140254）;湖北理工大学湖北省环境污染控制与修复重点实验室基金（2017101）

摘　　要：采用羧甲基-β-环糊精(CM-β-CD)和磁性介孔二氧化硅制得CM-β-CD/磁性介孔二氧化硅复合吸附剂(Fe3O4@SiO2@mSiO2-CM-β-CD),并应用于水体中Pb^2+的去除。通过SEM、EDS、FTIR、XRD等现代技术表征所得复合材料。研究表明:Fe3O4@SiO2@mSiO2-CM-β-CD对Pb^2+的吸附遵循伪二级模型,符合Langmuir模型。在298 K时,Pb2+的理论饱和吸附量为60.8 mg/g。此外,热力学参数表明吸附过程是自发的。最后,Fe3O4@SiO2@mSiO2-CM-β-CD表现出优异的磁分离性能,此外还证明在强酸性条件下具有良好的稳定性。经5次再生循环作用后,Fe3O4@SiO2@mSiO2-CM-β-CD对Pb^2+仍保持较高的吸附容量。CM-β-CD/magnetic mesoporous silica composite adsorbent(Fe3O4@SiO2@mSiO2-CM-CD)was prepared by using carboxymethyl-β-cyclodextrin(CM-β-CD)and magnetic mesoporous silica,and applied to the removal of Pb^2+ in water.The resulting composite was characterized by modern techniques such as SEM,EDS,FTIR,XRD.The results show that the adsorption of Pb^2+ by Fe3O4@SiO2@mSiO2-CM-β-CD follows the pseudo-secondary model and conforms to the Langmuir model.At 298 K,the theoretical saturated adsorption capacity of Pb^2+ is 60.8 mg/g.In addition,thermodynamic parameters indicate that the adsorption process is spontaneous.Finally,Fe3O4@SiO2@mSiO2-CM-β-CD exhibits excellent magnetic separation properties,and also demonstrates good stability under strong acidic conditions.After 5 cycles of regeneration,Fe3O4@SiO2@mSiO2-CM-β-CD still maintains a high adsorption capacity for Pb^2+.

关 键 词：Β-环糊精 磁性 介孔二氧化硅 吸附 PB^2+ 

分 类 号：X703[环境科学与工程—环境工程]