次石墨-纳米Cu2O/Cu制备及对UO22+去除性能研究
Construction of Nano-Cu2O/Cu-Schungite and Its Removal of Uranyl Ions
李正伟 1张宏丽 1刘迪 2唐浩铭 1王可 1林森 3吕瑞 1孙仕勇3
作者信息
- 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 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;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
- 折叠
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UO22+具有高效协同去除效能的ShC-Cu2O/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-Cu2O/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UO22+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-Cu2O/Cu对UO22+的吸附过程符合准二级动力学模型和Langmuir模型,在40 min内对UO22+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Cu2O/Cu与UO22+氧化还原作用及次石墨吸附作用的协同效应.
Abstract
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-Cu2O/Cu composites adsorbent via hydrothermal method.The microstructure and morphology of ShC and ShC-Cu2O/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 UO22+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 Cu2O/Cu and UO22+along with absorption properties offered by ShC.
关键词
次石墨/纳米Cu2O/Cu/UO22+/核素清除剂Key words
schungite/nano-Cu2O/Cu/UO22+/nuclide scavenger引用本文复制引用
基金项目
国家自然科学基金(42061134018)
四川省国际科技创新合作项目(2024YFHZ0262)
出版年
2024
NETL
NSTL
万方数据