磁性氧化石墨烯对水中Cu(Ⅱ)和Co(Ⅱ)的快速去除与吸附机理  

Ultrafast Removal and Adsorption Mechanism of Cu(Ⅱ)and Co(Ⅱ)in Water by Magnetic Graphene Oxide

作　　者：布林朝克[1,2] 朱艳华 郭婷 李波[2] BULIN Chao-ke;ZHU Yan-hua;GUO Ting;LI Bo(College of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;Department of Functional Material Research,Central Iron and Steel Research Institute,Beijing 100081,China;Baotou Ecological Environment Monitoring Station of Inner Mongolia,Baotou 014010,Inner Mongolia,China;College of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]钢铁研究总院功能材料研究所,北京100081 [3]内蒙古包头生态环境监测站,内蒙古包头014010 [4]内蒙古科技大学能源与环境学院,内蒙古包头014010

出　　处：《矿冶工程》2021年第4期161-165,共5页Mining and Metallurgical Engineering

基　　金：内蒙古自治区高校基金(NJZY21392);内蒙古自治区自然科学基金(2020ZD17)。

摘　　要：制备了磁性氧化石墨烯(MGO)吸附剂,并用于去除水中的Cu(Ⅱ)和Co(Ⅱ),分析了吸附等温线、动力学、热力学,探讨了吸附机理。结果表明,当MGO用量为500 mg/L时,其对水中Cu(Ⅱ)和Co(Ⅱ)(初始浓度均为600.53 mg/L)的吸附分别于7 min和5 min达到平衡,对Cu(Ⅱ)的吸附率和吸附量分别为92.77%和1114.22 mg/g,对Co(Ⅱ)的吸附率和吸附量分别为88.74%和1065.81 mg/g。MGO对Cu(Ⅱ)和Co(Ⅱ)的吸附为热力学自发的吸热过程,符合Freundlich模型和准二级动力学模型;吸附基于MGO的含氧官能团对Cu(Ⅱ)和Co(Ⅱ)的化学作用力。MGO吸附剂对水中Cu(Ⅱ)和Co(Ⅱ)具有快速高效的吸附性能,是一种应用前景良好的重金属吸附材料。Magnetic graphene oxide(MGO)was prepared and used as a potential adsorbent for removing Cu(Ⅱ)and Co(Ⅱ)in water.The adsorption mechanism was discussed based on the analysis of adsorption isotherms,kinetics and thermodynamics.It is shown that the adsorptions of Cu(Ⅱ)and Co(Ⅱ)(with an equal initial concentration of 600.53 mg/L)onto MGO(with the dosage of 500 mg/L)were equilibrated at 7 min and 5 min,respectively,and the rate of adsorption and the adsorption capacity of Cu(Ⅱ)were 92.77%and 1114.22 mg/g,while those of Co(Ⅱ)were 88.74%and 1065.81 mg/g,respectively.The adsorption is thermodynamically spontaneous and endothermic process,which conforms well to the Freundlich and pseudo-second-order models.Moreover,the adsorption is principally based on the chemical interactions of the oxygen-containing groups in MGO with Cu(Ⅱ)and Co(Ⅱ).With ultrafast and highly efficient adsorption performance,MGO may be a promising adsorbent for heavy metals in aqueous solution.

关 键 词：石墨烯 吸附剂 重金属离子 磁性氧化石墨烯 铜离子 钴离子 吸附机理 

分 类 号：TF01[冶金工程—冶金物理化学]