高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (8): 1485.doi: 10.7503/cjcu20150160

• 分析化学 • 上一篇    下一篇

N,N'-二乙基-N,N'-二(丙氧基苯基)-2,6-吡啶二酰胺对铀酰离子的选择性络合萃取

陈龙, 李艳, 王真文, 彭智勇, 杨泽明, 袁立华, 冯文()   

  1. 四川大学化学学院, 原子核科学技术研究所, 辐射物理及技术教育部重点实验室, 成都 610064
  • 收稿日期:2015-02-16 出版日期:2015-08-10 发布日期:2015-07-17
  • 作者简介:联系人简介: 冯 文, 女, 研究员, 博士生导师, 主要从事新型萃取剂的合成及应用研究. E-mail:wfeng9510@scu.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: 21471105)和国家自然科学基金国家基础科学人才培养基金(批准号: J1210004, J1103315)资助

High Efficiency and Selective Extraction of Uranyl Ion by N,N'-Diethyl-N,N'-bis(propoxyphenyl)-2,6-dipicolinamide

CHEN Long, LI Yan, WANG Zhenwen, PENG Zhiyong, YANG Zeming, YUAN Lihua, FENG Wen*()   

  1. College of Chemistry, Institute of Nuclear Science and Technology, Key Laboratory for Radiation Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610064, China
  • Received:2015-02-16 Online:2015-08-10 Published:2015-07-17
  • Contact: FENG Wen E-mail:wfeng9510@scu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21471105) and the National Science Foundation for Fostering Talents in Basic Research of the National Natural Science Foundation of China(Nos.J1210004, J1103315)

摘要:

研究了新型萃取剂N,N'-二乙基-N,N'-二(丙氧基苯基)-2,6-吡啶二酰胺(1a~1c)对铀酰离子(UO22+)的络合萃取. 结果表明, 当不加硝酸或硝酸浓度为6 mol/L时, 化合物1a对UO22+的萃取率分别高达99%和94%. 在6 mol/L HNO3的高酸度条件下, 化合物1a能实现UO22+和镧系元素(La, Eu及Yb)的选择性分离[分离比SFU(Ⅵ)/Ln(Ⅲ)>20]; 而化合物1b和1c则可以实现UO22+和轻镧系元素(La, Eu)之间的分离. 双对数图(lg-lg plot)实验结果表明, 化合物1a~1c与UO22+的萃合比在1~2之间, 表明同时存在2∶1和1∶1两种比例的萃合物. 核磁共振波谱和红外光谱数据证明吡啶氮和羰基氧参与了对UO22+的配位.

关键词: 吡啶二酰胺, 铀酰离子, 络合萃取, 选择性

Abstract:

To acquire a more efficent and selective dipicolinamide, the affinity of three novel diamide derivatives of dipicolinic acids N,N'-diethyl-N,N'-bis(propoxyphenyl)-2,6-dipicolinamide(1a—1c) for uranyl ion was investigated by liquid-liquid extraction method. In the absence of HNO3 and in the presence of 6 mol/L HNO3, the extractability of compound 1a for uranyl ion was 99% and 94%, respectively. At the same high acidity, selective separation of uranyl from lanthanides(La, Eu and Yb) was achieved using compound 1a as extractant [SFU(VI)/Ln(III)>20]. In contrast, compounds 1b and 1c were able to separate uranyl ion from lighter lanthanides(La and Eu). Result of lg-lg plot experiments indicated the stoichiometric ratios of compounds 1a, 1b and 1c with uranyl were found to fall between 1 and 2, suggesting the presence of two kinds of extracted species in 2∶1 and 1∶1 ratios(extractant∶uranyl). 1H NMR and FTIR spectra of the extracted complexes implicated the involvement of nitrogen atom in the pyridine ring and carbonyl group in coordinating uranyl ion. The results showed that compound 1a is the most promising extractant and probably can be used in the recycling of uranyl ion.

Key words: Dipicolinamide, Uranyl ion, Extraction, Selectivity

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