; Chen Jing
; Zhang ChengFeng
; Pan QingHua
; Sun Yan
; Liu ShaoXuan
; Li WeiHong
; Yang ZhanLan
; Weng ShiFu
; Xu YiZhuang
; Wu JinGuang] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
; [Zhang ChengFeng
; Liu XueXin] Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
; [Li ZhiHong
; Hu TianDou] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
In this paper, we have investigated the formation of the third-phase in tertiary amine (N235)-PtCl62--HCl system and the microscopic phase structural evolution of platinum-loaded organic phases before and after the occurrence of the third-phase. The third-phase is characterized by various spectroscopic techniques, and the small angle X-ray scattering (SAXS) experiments demonstrate the appearance of nano-aggregates, i.e., water-in-oil reversed micelles, in the third phase. The experimental results indicate that (1) formation of the third phase is related to the aggregation behaviors of nano-reversed micelles in which a super-concentrated hydrochloric acid formed with the H+ to H2O molar ratio being much higher than that of the conventional 37 wt% saturated hydrochloric acid. (2) The occurrence of the super-concentrated HCl results in a great amount of H+ and Cl- ions enriched and confined within the nano-water pools of W/O reversed micelles in third phase. Therefore, the coordination behaviors of platinum complex ions in that super-concentrated hydrochloric acid are very different from their corresponding behaviors in bulk aqueous solutions. It is possible that H+ ions participate in the formation of such complexes as HmPtCl6z+ in the super-concentrated hydrochloric acid. (3) The relative contents of various HmPtCl6z+ complexes are different corresponding to the H+ ion concentrations in confined nanowater pools. The association ability of the acidified tertiary amine N235 molecules (R3NH+) with various HmPtCl6z+ complexes plays an important role in affecting the platinum extraction behaviors.
Huang, K,Chen, J,Zhang, CF,et al. Formation of super-concentrated hydrochloric acid in the third phase in tertiary amine N235-ptCl(6)(2-)-HCl system and its influences on the Pt microemulsion extraction[J]. SCIENCE IN CHINA SERIES B-CHEMISTRY,2009,52(11):1825-1834.
Huang, K.,Chen, J.,Zhang, CF.,Li, ZH.,Pan, QH.,...&胡天斗.(2009).Formation of super-concentrated hydrochloric acid in the third phase in tertiary amine N235-ptCl(6)(2-)-HCl system and its influences on the Pt microemulsion extraction.SCIENCE IN CHINA SERIES B-CHEMISTRY,52(11),1825-1834.
Huang, K,et al."Formation of super-concentrated hydrochloric acid in the third phase in tertiary amine N235-ptCl(6)(2-)-HCl system and its influences on the Pt microemulsion extraction".SCIENCE IN CHINA SERIES B-CHEMISTRY 52.11(2009):1825-1834.