ZIF-8掺杂石墨烯/壳聚糖小球吸附重金属Cu^(2+)的研究  

Adsorption of heavy metal Cu^(2+)by ZIF-8 doped graphene/chitosan microspheres

作　　者：吐孙尼亚则·麦麦提 禹宝伟 钟钦梅 袁月 杨胜韬[1] Tusunniyaze Maimaiti;YU Bao-wei;ZHONG Qin-mei;YUAN Yue;YANG Sheng-tao(School of Chemistry and Environment,Southwest Minzu University,Chengdu 610041,China)

机构地区：[1]西南民族大学化学与环境学院,四川成都610041

出　　处：《西南民族大学学报(自然科学版)》2024年第6期636-643,共8页Journal of Southwest Minzu University(Natural Science Edition)

基　　金：四川省科技厅基金项目(2023JDRC0014,2023NSFSC0345);西南民族大学研究生中央高校项目(2022NYXXS088)。

摘　　要：水中重金属具有不可生物降解和生物富集性,因此水体重金属污染问题一直备受关注.制备易于回收的微米级锌基金属有机框架(ZIF-8)掺杂石墨烯/壳聚糖(GO/CS/ZIF-8)小球,重点关注该小球对水中典型重金属离子——Cu^(2+)的吸附性能及机理.结果表明,GO/CS/ZIF-8小球对Cu^(2+)的吸附量可达101.8 mg/g,且吸附以单分子层吸附为主,Freundlich模型能很好地模拟小球对Cu^(2+)的等温吸附过程;吸附动力学拟合表明GO/CS/ZIF-8小球对Cu^(2+)的吸附符合伪二级动力学模型,说明该吸附以化学吸附为主;吸附热力学数据表明该吸附为吸热过程,升温有利于吸附的进行.The issue of heavy metal pollution in water has garnered significant attention due to the non-biodegradable and bioen-riched nature.In this study,we prepared micro-scale sized Zinc-based metal-organic framework(ZIF-8)doped graphene/chi-tosan(GO/CS/ZIF-8)microspheres that can be easily recovered,with a focus on investigating their adsorption properties and mechanism towards Cu^(2+)ions in aqueous solution.The results demonstrated that GO/CS/ZIF-8 microspheres exhibited an im-pressive adsorption capacity for Cu^(2+)ions,reaching 101.8 mg/g primarily through single molecular layer chemisorption.Fur-thermore,the Freundlich model effectively simulated the isothermal adsorption process of Cu^(2+)by GO/CS/ZIF-8 micro-spheres.The fitting analysis of adsorption kinetics demonstrated that the adsorption of Cu^(2+)by GO/CS/ZIF-8 microspheres ad-hered to the pseudo-second-order kinetic model,indicating predominant chemisorption.Thermodynamic analysis revealed that this adsorption process was endothermic,with increased temperature favoring higher levels of adsorption.

关 键 词：ZIF-8 石墨烯 小球 Cu^(2+) 吸附 

分 类 号：X703[环境科学与工程—环境工程] TB383[一般工业技术—材料科学与工程] O647.32[理学—物理化学]