N,N′-tetrasubstituted succinamides as new molecules for liquid-liquid extraction of Pt(IV) from chloride media

被引:19
作者
Costa, Maria Clara [1 ]
Almeida, Ruben [1 ]
Assuncao, Ana [1 ]
Rosa da Costa, Ana Maria [2 ]
Nogueira, Carlos [3 ]
Paiva, Ana Paula [4 ]
机构
[1] Fac Ciencias & Tecnol, Dept Quim & Farmacia, Ctr Ciencias Mar, Campus Gambelas, P-8005139 Faro, Portugal
[2] Fac Ciencias & Tecnol, Dept Quim & Farmacia, Ctr Invest Quim Algarve, Campus Gambelas, P-8005139 Faro, Portugal
[3] IP, Lab Nacl Energia & Geol, Estr Paco do Lumiar 22, P-1649038 Lisbon, Portugal
[4] Univ Lisbon, Fac Ciencias, Ctr Quim & Bioquim, P-1749016 Lisbon, Portugal
关键词
Platinum; Succinamide derivatives; Liquid-liquid extraction; Hydrochloric acid; HYDROCHLORIC-ACID SOLUTIONS; PLATINUM-GROUP METALS; SOLVENT-EXTRACTION; RECOVERY; PALLADIUM; SEPARATION; RHODIUM; IRON(III);
D O I
10.1016/j.seppur.2015.12.035
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Due to the increasing demand of platinum group metals (PGM's), among which platinum, the search for new alternatives aiming to their extraction and recovery is nowadays of great importance. Thus, two N,N'-tetrasubstituted succinamides, N,N'-dicyclohexyl-N,N'-dimethylsuccinamide (DMDCHSA) and N,N'dimethyl-N,N'-diphenylsuccinamide (DMDPHSA) were synthesized and investigated, for the first time, as potential molecules for the liquid-liquid extraction of Pt(IV) from chloride solutions. According to the extraction and stripping results obtained in a single contact, these succinamides can be considered promising extractants for the recovery of platinum(IV) from hydrochloric acid media, since DMDCHSA is able to extract more than 95% Pt(IV) from 4 M HCl or higher concentrations, and DMDPHSA extracts 80% and 92% Pt(IV) from 6 M and 8 M HCl solutions, respectively. Furthermore, platinum(IV) can successfully be stripped through a simple contact with seawater: 93% Pt(IV) were recovered from DMDCHSA, while 60% stripping were obtained from DMDPHSA. For each compound, the time necessary to reach equilibrium, and the effects of the type of diluent and different extractant concentrations on the Pt(IV) extraction percentage were investigated. The loading capacity of DMDCHSA and DMDPHSA toward Pt (IV) was also evaluated, and the results show that both extractants present a very high loading capacity. In addition, data obtained from successive extraction-stripping cycles suggest a good stability pattern for both succinamides. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:409 / 416
页数:8
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