巯基修饰Cu-MOFs材料的制备及其汞吸附性能  

Preparation of ethanedithiol modified Cu-MOFs and its adsorption performance for mercury

作　　者：魏金枝[1] 张少平[1] 王雪亮[1] 孙晓君[1] 张凤鸣[1] 

机构地区：[1]哈尔滨理工大学化学与环境工程学院,黑龙江哈尔滨150040

出　　处：《化工学报》2017年第5期2186-2194,共9页CIESC Journal

基　　金：国家自然科学基金项目(21676066);黑龙江省自然科学基金项目(E2016042)~~

摘　　要：为高效对废水中的Hg^(2+)进行吸附,采用电化学法合成Cu-BDC金属有机骨架材料,并进行SH修饰,制备SH-Cu-BDC材料,用于对含Hg^(2+)废水的吸附研究。通过EDS与IR红外对修饰前后样品的表征分析可知,SH基团成功修饰到Cu-BDC材料上;N_2吸附实验表明,修饰后的SH-Cu-BDC材料出现微孔结构且比表面积增大;SEM分析表明,电化学合成Cu-BDC材料具有独特花状结构,修饰后SH-Cu-BDC材料表面均匀分布着触角状物质;10 mg SH-Cu-BDC对20 ml浓度为300 mg·L^(-1)的Hg^(2+)溶液进行吸附,当pH(28)5,60 min时吸附饱和,最大吸附量为585 mg·g-1;SH-Cu-BDC材料对Hg^(2+)的吸附符合拟二级反应动力学方程和Langmuir吸附等温模型,该吸附过程是以表面吸附为主的扩散过程,且符合单分子层吸附规律;吸附再生实验表明,SH-Cu-BDC作为吸附剂可重复使用,且具有一定的稳定性。In order to adsorb Hg^2＋ in waste water efficiently and quickly, copper-based metal organic frameworks （Cu-MOFs） were prepared using electrochemical method and modified by ethanedithiol to deposit sulfhydryl on it. The SH-Cu-BDC materials obtained were used for adsorbing Hg^2＋ in waste water. The samples modified before and after were characterized with EDS, IR, N2 adsorption, SEM. The results show that： --SH groups have been connected to the surface of Cu-BDC materials; the modified SH-Cu-BDC materials have micro-porous structure and large specific surface area as well as unique flower structure and evenly distribute antenna shape matter. 10 mg SH-Cu-BDC can absorb about 20 ml Hg^2＋ solution （300 mg · L^-1） at pH = 5. The adsorption reaches saturation after 60 min and the maximum capacity （saturated adsorption capacity） is about 585 nag · g^-1. The adsorption of Hg^2＋ on SH-Cu-BDC is monolayer and follows quasi-second-order kinetics and Langmuir adsorption isotherm. Regeneration experiment shows that SH-Cu-BDC may reuse.

关 键 词：电化学 合成 金属有机骨架材料 巯基 修饰 吸附剂 HG^2+ 

分 类 号：X592[环境科学与工程—环境工程]