This study examined the effect influence of various factors on the extraction of Pd(II) to develop a new liquid-liquid extraction mechanism for the selective separation of palladium(II) from its acidic chloride solutions using 4-aroyl-3-phenyl-5-isoxazolones (HA), such as 3-phenyl-4-(4-fluorobenzoyl)-5- isoxazolone (HFBPI), 3-phenyl-4-benzoyl-5-isoxazolone (HPBI) and 3-phenyl-4- (4-toluoyl)-5-isoxazolone (HTPI). The extraction strength of Pd(II) with HA were in the following order: HFBPI > HPBI > HTPI, which is opposite to that observed with their pKavalues. HPBI was used to separate Pd(II) from Pt(IV), Ni(II) and Rh(III) metal ions and calculated their separation factors (S.F.) were followed in the order: Pd/Ni (40±0.4) > Pd/Pt (25±0.2) > Pd/Rh (15±0.3 > Rh/Ni (2.7±0.3) > Pt/Ni ≈ Rh/Pt (1.7±0.2). The loading and striping of Pd(II) (1.12×10-4mol L-1) were also examined using 1.0×10-3mol L-1HPBI in CHCl3and 1.0 mol L-1HCl, respectively. The results demonstrated that the maximum (97.5%) extraction and desorption (89%) of metal required at least 3.0 cycles. The developed method was applied successfully to the separation of palladium from synthetic water samples.
本研究旨在研究各种因素对Pd(II)的萃取影响,以开发一种新的液液萃取机制,用于从其酸性氯化物溶液中选择性分离钯(II),使用4-酰基-3-苯基-5-异恶唑酮(HA),例如3-苯基-4-(4-氟苯酰基)-5-异恶唑酮(HFBPI),3-苯基-4-苯甲酰基-5-异恶唑酮(HPBI)和3-苯基-4-(4-甲苯基)-5-异恶唑酮(HTPI)。 Pd(II)与HA的萃取强度按以下顺序排列:HFBPI> HPBI> HTPI,与其pK a 值观察到的相反。使用HPBI从Pt(IV),Ni(II)和Rh(III)金属离子中分离Pd(II),计算它们的分离因子(SF),顺序如下:Pd / Ni(40±0.4)> Pd / Pt(25±0.2)> Pd / Rh(15±0.3> Rh / Ni(2.7±0.3)> Pt / Ni ≈ Rh / Pt(1.7±0.2)。还使用1.0×10-3mol L-1 HPBI在CHCl3和1.0mol L-1 HCl中分别检查了Pd(II)(1.12×10-4mol L-1)的负载和剥离。结果表明,金属的最大(97.5%)萃取和脱附(89%)需要至少3.0个周期。该方法成功应用于从合成水样品中分离钯。