磁性氧化石墨烯/壳聚糖纳米复合材料的制备及其对UO_2^(2+)的吸附性能  

Synthesis of Magnetic Graphene Oxide/Chitosan Nanocomposite and Application on Removal of UO_2^(2+) from Aqueous Solution

作　　者：王乐乐[1] 黄国林[1] 吕婷婷[1] 彭炜[1] 裘阳 张葭榕 

机构地区：[1]放射性地质与勘探技术国防重点学科实验室东华理工大学,江西南昌330013

出　　处：《原子能科学技术》2017年第10期1734-1741,共8页Atomic Energy Science and Technology

基　　金：江西省对外合作重点项目资助(20161BBH80046);东华理工大学省部共建核资源与环境国家重点实验室培育基地资助项目(NRE1611);纳米矿物材料及应用教育部工程研究中心(武汉)开放课题资助项目(NGM2016KF003)

摘　　要：以氧化石墨烯和壳聚糖为原料,1-乙基-(3-二甲基氨基丙基)3-乙基碳二亚胺盐酸盐(EDC)和N-羟基琥珀酰亚胺(NHS)为活化剂,超声法制备了磁性氧化石墨烯/壳聚糖纳米复合材料(MCGO),并研究了其对水溶液中UO_2^(2+)的吸附性能。SEM、FT-IR和XRD分析结果表明,成功制得了MCGO,且负载的Fe_3O_4尺寸为nm级。在温度为288K、pH=5.5、UO_2^(2+)初始浓度为160 mg/L、吸附时间为1.5h时,MCGO吸附容量为266.67mg/g。对实验数据进行热力学和动力学模型拟合,结果表明,MCGO吸附行为符合Langmuir模型和准二级动力学模型,且吸附为吸热自发过程。MCGO第1次重复利用率高达98.47%,经过6次吸附-脱附后,重复利用率仍有74.43%,具有较好的重复利用性。Magnetic graphene oxide/chitosan（MCGO）nanocomposite was prepared by ultrasonic method using graphene oxide and chitosan as raw materials and 1-ethyl-3-（3-dimethylaminopropyl）carbodiimide hydrochloride（EDC）and N-hydroxy succinimide（NHS）as activators,and the adsorption performance of UO2^2＋ on MCGO was investigated.The results of SEM,FT-IR and XRD show that MCGO is successfully achieved,and the size of Fe3O4 is nanoscale.It is found that the MCGO has equilibrium adsorption capacity of 266.67mg/g at pH=5.5,initial UO2^2＋concentration of 160mg/L,adsorption time of 1.5h and adsorption temperature of 288 K.The experimental equilibriumdata were fitted with thermodynamics and kinetics models.The results show that MCGO conforms to Langmuir isotherm model and pseudo-second order kinetic model as well as the adsorption of endothermic spontaneous process.The first re-utilization rate of MCGO is up to 98.47%,and reaches 74.43% after repeatedly adsorbing and desorbing for 6 cycles,which shows that MCGO has a good reusability.

关 键 词：氧化石墨烯 壳聚糖 纳米复合材料 超声法 UO2^2+ 吸附 

分 类 号：O647.3[理学—物理化学]