摘要
研究了用咪唑离子液体萃取铼(Re)及用硝酸溶液从负载铼的离子液体反萃取铼。结果表明:硝基咪唑离子液体对铼的萃取性能优于不含硝基的咪唑离子液体,铼萃取率最高可达99%;离子液体对铼的萃取受pH影响不大;硝酸溶液初始浓度越高,离子液体对铼的萃取率越低;初始硝酸浓度为3mol/L时,体系中其他阳离子(如Na+,Ni 2+,Sr2+或Eu3+)的存在对萃取效果影响不大;在有CH2Cl2存在时,随硝酸初始浓度提高,铼反萃取率提高;用8mol/L硝酸溶液反萃取铼,反萃取率可达98%;铼的萃取与反萃取符合阴离子交换机制。磁氢谱(1 H NMR)分析结果表明:硝基的引入增大了咪唑环对阴离子的亲和性,离子液体的烷基链越长(疏水性越高),对铼的萃取率越高。
In the present work,the extraction of rhenium using imidium ionic liquids(ILs)and the stripping of Re from ILs containing Re were studied.The results show that the extraction efficiency of nitroimidazolium ionic liquid for rhenium is higher than that of traditional imidazolium ionic liquid,and the highest extraction efficiency of Re is 99%.The results of 1 H NMR indicate that the introduction of nitro group can increase anion affinity of imidazole ring.The longer the alkyl chain(higher hydrophobicity)of ionic liquid,the higher the extraction efficiency for rhenium is;the extraction efficiency for rhenium varies slightly when pH of water phase changes,the higher the initial concentration of nitric acid in the solution,the lower the extraction efficiency of rhenium is.The other cations(such as Na+,Ni 2+,Sr 2+or Eu 3+)in the system have little effect on the extraction of rhenium under the condition of initial concentration of 3 mol/L HNO 3.The stripping can be improved while increasing the initial concentration of HNO 3 solution.Moreover,98%of rhenium can be stripped into 8 mol/L HNO 3 aqueous solution when CH 2Cl 2 is added.The extraction and stripping mechanism for rhenium is the anion exchange.The extraction of rhenium into nitroimidazolium ionic liquid may provide an effective approach for recovering of rhenium from aqueous solution.
作者
王方元
邹宇
褚泰伟
WANG Fangyuan;ZOU Yu;CHU Taiwei(College of Chemistry and Molecular Engineering,Peking University, Beijing 100871,China;Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, Peking University,Beijing 100871,China;Beijing National Laboratory for Molecular Sciences,Beijing 100871,China)
出处
《湿法冶金》
CAS
北大核心
2018年第6期461-467,共7页
Hydrometallurgy of China
基金
国家自然科学基金资助项目(11575010
21371017)
关键词
离子液体
反萃取
萃取
硝基咪唑
ionic liquid
stripping
extraction
nitroimidazole
作者简介
第一作者,王方元(1992-),女,硕士研究生,主要研究方向为应用化学。E-mail:wangfy0929@pku.edu.cn;通信作者:褚泰伟(1971-),男,博士,副教授,主要研究方向为核燃料循环。E-mail:twchu@pku.edu.cn。
