Abstract
Liquid–liquid extraction of Ag(I) from nitrate solutions using N-(N′,N′-diethyl thiocarbamoyl)-N″-phenylbenzamidine (TCBA) and 1-6,-diethylcarbamoyl imino-1,6-diphenyl-2,5 dithiahexane (TCTH) dissolved in cumene has been studied. The extraction of Ag(I) from 1 mol dm−3 NO3− solutions by TCTH and TCBA was investigated as a function of several variables: equilibration time, organic phase diluent, pH of aqueous phase, Ag(I) and NO3− concentration in aqueous phase as well as TCBA and TCTH concentrations. Experimental equilibrium data were analysed numerically using the programs LETAGROP-DISTR and LETAPL and the results showed that Ag(I) extraction could be explained assuming the formation of AgL and AgNO3HL with TCBA (HL) and AgNO3S with TCTH (S). The metal extraction was not influenced significantly by the structures of the thiourea derivatives used as extractants. The back extraction of Ag(I) from loaded organic phase was performed using different strippants and 0.5 mol dm−3 NaSCN was found to be efficient for this purpose. © 2000 Society of Chemical Industry
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