高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (11): 1664.

• 论文 • 上一篇    下一篇

皂化酸性磷酸酯萃取稀土离子过程中有机相的FTIR光谱表征

姚淑心, 王笃金, 翁诗甫, 吴瑾光   

  1. 北京大学化学与分子工程学院, 稀土材料化学及应用国家重点实验室, 北京, 100871
  • 收稿日期:1994-12-01 修回日期:1995-04-20 出版日期:1995-11-24 发布日期:1995-11-24
  • 通讯作者: 吴瑾光
  • 作者简介:姚淑心,女,45,岁,讲师,四川师范大学化学系访问学者.
  • 基金资助:

    国家攀登计划资助课题

FTIR Characterization of Extracted Organic Phase in Saponified Organophosphoric Acid System Containing Lanthanide

YAO Shu-Xin, WANG Du-Jin, WENG Shi-Fu, WU Jin-Guang   

  1. State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University, Beijing, 100871
  • Received:1994-12-01 Revised:1995-04-20 Online:1995-11-24 Published:1995-11-24

PDF (PC)

被引次数

14

摘要： 研究了不同浓碱皂化的D2EHPA-正庚烷体系萃取一系列稀土离子(La3+→Lu3+,放射性的Pm除外)过程中有机相的FTIR光谱变化规律。结果表明:D2EHPA萃取稀土离子后,P=O基团的红外吸收频率降低,吸收强度升高,说明P=O基团与稀土离子发生配位;红外光谱研究结果还表明:不同稀土离子与P=O配位能力有差别,从La3+→Sm3+配位能力依次增大,从Sm3+→Lu3+则呈下降趋势,对同一个稀土离子来说,随着有机相中稀土离子含量的增加,有机相微乳液中H2O的含量减小,萃取过程伴随有破乳发生。

关键词: D2EHPA, 稀土, 微乳状液, FTIR

Abstract: FTIR spectroscopy was used to investigate the coordination interaction of D2EHPA[di(2-ethylhexyl) phosphoric acid] with lathanide(Ⅲ)series(La3+→Lu3+, except radioactive promethium). P=O band shifts to the lower frequency when D2EHPA is saponified with concentrated basic solutions (NaOH,KOH or NH3· H2O).The coordination sequence of Na+,K+and NH4+with P=O group is NH+>Na+>K+. The frequency of P=O band in the extracted organic phase containing RE-D2EHPA complexes shifts to the lower wavenumbers as the lanthanide(Ⅲ)loading increases in organic phase,and the intensity of P=O band increases. FTIR spectra results show that the coordination ability of lanthanide(Ⅲ)series with P=O group is as follows:La3+<Ce3+<Pr3+<Nd3+<Sm3+>Eu3+>…>Lu3+, namely,the complexation intreaction of Sm3+with P=O is the strongest.In addition,the w/o microemulsion was gradually destructed with the entrance RE3+into the organic phase.

Key words: D2EHPA, Rare earth, Microemulsion, FTIR

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