【作者】 张鹏； 陈耿； 吴志豪； 翁汉钦； 林铭章；

【Author】 ZHANG Peng;CHEN Geng;WU Zhi-hao;WENG Han-qin;LIN Ming-zhang;School of Physical Sciences,University of Science and Technology of China;Institute of Nuclear Energy Safety Technology,Chinese Academy of Sciences;

【机构】 中国科学技术大学物理学院； 中国科学院核能安全技术研究所；

【摘要】 还原氧化石墨烯(rGO)凝胶具有较大的比表面积,在U(Ⅵ)、Th(Ⅳ)等放射性核素的分离、回收方面有很大的应用前景。本工作采用γ射线辐照U(Ⅵ)、Th(Ⅳ)、Eu(Ⅲ)离子分别与氧化石墨烯(GO)混合后的体系,在GO自组装生成rGO凝胶的过程中同时进行凝胶对U(Ⅵ)、Th(Ⅳ)、Eu(Ⅲ)等离子的负载,以达到分离溶液中金属离子的目的。本工作探究了金属离子初始浓度、pH等因素对负载U(Ⅵ)、Th(Ⅳ)、Eu(Ⅲ)的影响,结果表明该方法可以实现金属离子的有效分离,U(Ⅵ)、Th(Ⅳ)的负载容量分别可达1001.8 mg/g和577.8 mg/g。此外,我们还研究金属离子的存在对rGO凝胶形成的影响,结果表明当Th(Ⅳ)、Eu(Ⅲ)离子存在时GO可在更宽的pH范围(1～6)形成凝胶,同时rGO凝胶形成所需的辐射吸收剂量大幅降低。此方法可用于分离水溶液中的放射性核素。更多还原

【Abstract】 Reduced graphene oxide(rGO) gel has a large specific surface area and has great application potential in the separation and recovery of radionuclides such as U(Ⅵ) and Th(Ⅳ).In this study,γ-ray irradiation was used to irradiate the aqueous solutions containing U(Ⅵ) and graphene oxide(GO),Th(Ⅳ) and GO,Eu(Ⅲ) and GO,respectively.U(VI),Th(Ⅳ),Eu(Ⅲ) ions could be loaded simultaneously as the rGO gel was self-assembled.After the load is completed,the block gel could be taken out directly from the solution to separate metal ions in the solution.The effects of initial ion concentration and pH on the in-situ separation of U(Ⅵ), Th(Ⅳ) and Eu(Ⅲ) were investigated.The results show that this method can effectively separate metal ions from aqueous solution.The load capacities of U(Ⅵ) and Th(Ⅳ) are up to 1001.8 and 577.8 mg/g,respectively.In addition,the effect of the presence of metal ions on the formation of rGO gel was also investigated.The results show that when U(Ⅵ) and Eu(Ⅲ) ions are present,the gel can be formed in a wider pH range(1～6).Meanwhile,Th(Ⅳ) and Eu(Ⅲ) ions can greatly reduce the absorbed dose required for rGO gel formation.This method can be used to separate radionuclides in aqueous solutions.更多还原