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

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (11): 1664.

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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

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

Abstract

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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YAO Shu-Xin, WANG Du-Jin, WENG Shi-Fu, WU Jin-Guang. FTIR Characterization of Extracted Organic Phase in Saponified Organophosphoric Acid System Containing Lanthanide[J]. Chem. J. Chinese Universities, 1995, 16(11): 1664.

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

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