次石墨-纳米Cu_(2)O/Cu制备及对UO_(2)^(2+)去除性能研究  

Construction of Nano-Cu_(2)O/Cu-Schungite and Its Removal of Uranyl Ions

作　　者：李正伟 张宏丽 刘迪 唐浩铭 王可[1] 林森[1,3] 吕瑞 孙仕勇[1,3] Li Zhengwei;Zhang Hongli;Liu Di;Tang Haoming;Wang Ke;Lin Sen;LüRui;Sun Shiyong(Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education,School of Environment and Resource,Southwest University of Science and Technology,Mianyang,Sichuan 621010;Chongqing Institute of Metrology and Quality Testing,Chongqing 401121;Key Laboratory of Non-metallic Mineral Geology and Utilization in Sichuan Provincial Higher Education Institutions,Southwest University of Science and Technology,Mianyang,Sichuan 621010)

机构地区：[1]西南科技大学环境与资源学院,固体废物处理与资源化教育部重点试验室,四川绵阳621010 [2]重庆市计量质量检测研究院,重庆401121 [3]西南科技大学非金属矿产地质及其开发利用四川省高等学校重点试验室,四川绵阳621010

出　　处：《非金属矿》2024年第3期22-27,共6页Non-Metallic Mines

基　　金：国家自然科学基金(42061134018);四川省国际科技创新合作项目(2024YFHZ0262)。

摘　　要：如何高效、快速清除放射性核素是当前核医学领域亟待解决的关键技术问题之一。选取放射性核素铀(VI)为对象,以次石墨(ShC)为载体,采用水热法制得对UO_(2)^(2+)具有高效协同去除效能的ShC-Cu_(2)O/Cu纳米复合材料。通过扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、傅里叶红外光谱(FTIR)、比表面积检测(BET)等对比了ShC及ShC-Cu_(2)O/Cu的微观形貌与结构,并系统探究了吸附剂用量、pH、吸附时间等因素对UO_(2)^(2+)吸附效率的影响。最后,通过吸附过程中的热力学、动力学行为及吸附前后的X射线光电子能谱(XPS)分析了其去除机理。结果表明,纳米ShC-Cu_(2)O/Cu对UO_(2)^(2+)的吸附过程符合准二级动力学模型和Langmuir模型,在40 min内对UO_(2)^(2+)的去除率可达91%,最大吸附量达35.44 mg/g,其高效的吸附能力归因于Cu_(2)O/Cu与UO_(2)^(2+)氧化还原作用及次石墨吸附作用的协同效应。The efficient and rapid removal of radioactive isotopes is one of the key technical issues that urgently need to be addressed in the field of nuclear medicine.Using uranium(VI)as a representative radionuclide and ShC as precursor to synthesize nano-ShC-Cu_(2)O/Cu composites adsorbent via hydrothermal method.The microstructure and morphology of ShC and ShC-Cu_(2)O/Cu were characterized by SEM,TEM,XRD,FTIR,and BET.Furthermore,the influence of adsorbent dosage,pH value,and adsorption time on the efficiency of UO_(2)^(2+)adsorption were systematically investigated.Subsequently,the removal mechanism was elucidated by analyzing thermodynamic,kinetic and XPS.It was demonstrated that the adsorption process followed quasi-second-order kinetics model as well as Langmuir isotherm model.The maximum removal efficiency achieved 91%within 40 minutes,as well as a maximum adsorption capacity reaching 35.44 mg/g.The mechanism indicated the high capacity was attributed to the synergistic effect between redox reaction between Cu_(2)O/Cu and UO_(2)^(2+)along with absorption properties offered by ShC.

关 键 词：次石墨 纳米Cu_(2)O/Cu UO_(2)^(2+) 核素清除剂 

分 类 号：O615[理学—无机化学] TB321[理学—化学]