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Adsorption of heavy rare earth(III) with extraction resin containing bis(2,4,4-trimethylpentyl) monothiophosphinic acid

By Jia Q, Wang ZH, Li DQ and Niu CJ

Abstract

In the present paper, the adsorption of thulium(Ill) from chloride medium on an extraction resin containing bis(2,4,4-trimethylpentyl) monothiophosphinic acid (CL302, HL) has been studied. The results show that 1.5 h is enough for the adsorption equilibrium. The distribution coefficients are determined as a function of the acidity of the aqueous phase and the data are analyzed both graphically and numerically. The plots of log D versus pH give a straight line with a slope of about 3, indicating that 3 protons are released in the adsorption reaction of thulium(III). The content of Cyanex302 in the resin is determined to be 48.21%. The total amount of Tm3+ adsorbed up to resin saturation is determined to be 82.46 mg Tm3+/g resin. Therefore, the sorption reactions of Tm3+ from chloride medium with CL302 can be described as: Tm3+ + 3HL((r)) <----> TmL3(r) + 3H(+) The Freundlich's isothermal adsorption equation is also determined as: log Q = 0.73 log C + 3.05 The amounts (Q) of Tm3+ adsorbed with the resin have been studied at different temperatures (15-40degreesC) at fixed concentrations of Tm3+, amounts of extraction resin, ion strength and acidities in the aqueous phase

Topics: 1-HEXYL-4-ETHYLOCTYL ISOPROPYLPHOSPHONIC ACID, IMPREGNATED RESINS, SOLVENT-EXTRACTION, LEVEXTREL RESINS, SEPARATION, ION, Solvent extraction, Separation, ion, 溶剂萃取, EXTRACTION PAR SOLVANTS, SELEKTIVE LAUGUNG, 分离, electrostatic separation, pervaporation, segregation, Interlending OSI Network
Year: 2004
DOI identifier: 10.1016/j.jallcom.2003.11.056
OAI identifier: oai:ir.ciac.jl.cn:322003/15589
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