萃取热力学研究(Ⅰ)——PMBP-DPSO-Er(ClO_(4))_(3)-C_(6)H_(5)CH_(3)体系

Thermodynamic Studies of Extraction(Ⅰ) --PMBP-DPSO-Er (C1O_(4))_(3)-C0H_(5)CH_(3) Systems

本文研究了1-苯基-3-甲基-4-苯甲酰基吡唑啉酮-5(PMBP)与二苯基亚砜(DPSO)的甲苯溶液在高氯酸介质中对铒(Ⅲ)的协同萃取,测得了萃合物的组成和各萃取反应的平衡常数及热力学函数增量.PMBP是一种优良的具有β-双酮结构的螯合型萃取剂,它的萃取力不仅比早期常用的同一类型萃取剂(TTA)强,而且价格也便宜,因此,已被广泛应用于各种元素的萃取分离分析方面^([1-7]).

The extraction of Europium ( Ⅲ ) from perchloric acid solution with mixtures of l-phenyl-3-methyl-4-benzoyl-pyrazolone-5 (PMBP or HA) and diphenyl sulfoxide (DPSO or B) in toluene has been investigated.The formulas of the extracted species have been shown to be ErA_(3)·HA, ErA_(3)·B and ErA_(3)·2B. Their extraction equilibrium constants and thermodynamic parameters of the enthalpy change (ΔH) Gibbs free energy change (ΔG) and entropy change (ΔS) have been calculated at 298.2K.