巯基修饰Cu-MOFs材料的制备及其汞吸附性能

发布时间：2018-04-11 03:03

本文选题：电化学 + 合成　；参考：《化工学报》2017年05期

【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。
[Abstract]:In order to efficiently adsorb Hg~(2 in wastewater, Cu-BDC metal-organic skeleton material was synthesized by electrochemical method and modified with SH to prepare SH-Cu-BDC material, which was used to study the adsorption of wastewater containing Hg~(2.The results of EDS and IR IR analysis showed that the SH group was successfully modified to the Cu-BDC material. The results showed that the modified SH-Cu-BDC material had a microporous structure and a larger specific surface area, which showed that the modified SH-Cu-BDC material had a micropore structure and a larger specific surface area, and the results showed that the modified SH-Cu-BDC material had a micropore structure and a larger specific surface area.The electrochemically synthesized Cu-BDC material has a unique flower-like structure. The modified SH-Cu-BDC material is uniformly distributed on the surface of the modified SH-Cu-BDC material by the adsorption of 10 mg SH-Cu-BDC on the Hg~(2 solution with a concentration of 300mg / L ~ (-1), and is saturated at pH = 28560 min.The adsorption of Hg~(2 on SH-Cu-BDC material with the maximum adsorption capacity of 585mg g ~ (-1) accords with the pseudo-second-order reaction kinetics equation and the Langmuir adsorption isotherm model. The adsorption process is a diffusion process dominated by surface adsorption and accords with the law of monolayer adsorption.Adsorption and regeneration experiments show that SH-Cu-BDC can be reused as adsorbent and has certain stability.
【作者单位】：哈尔滨理工大学化学与环境工程学院;
【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)~~
【分类号】：TQ424;X703.1

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