Hydrometallurgical thermodynamics—IV. Effect of dimethylsulfoxide on the activity of Cu2+ in chloride media and free energies of transfer of CuCl−2 and AgCl−2 from water to aqueous dimethylsulfoxide
Muir, D.M., Singh, P., Kenna, C.C. and Senanayake, G. (1989) Hydrometallurgical thermodynamics—IV. Effect of dimethylsulfoxide on the activity of Cu2+ in chloride media and free energies of transfer of CuCl−2 and AgCl−2 from water to aqueous dimethylsulfoxide. Electrochimica Acta, 34 (11). pp. 1573-1579.
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Reduction potentials of the Cu(II)/Cu(I), Cu(I)/Cu(0) and Ag(I)/Ag(0) couples have been measured over the whole range of dimethylsulfoxide—water compositions in the presence of 0.1 M HCl and the changes in activity and free energies of transfer (ΔGtr) of Cu2+, Cu+, CuCl−2, Ag+ and AgCl−2 from water to DMSOH2O mixtures are reported. Over the entire range of DMSOH2O compositions, values of ΔGtr CuCl−2 and AgCl−2 remain relatively constant with respect to water whilst values of ΔGtr, Cu2+, Cu+ and Ag+ decrease significantly. The competitive solvation and complexation of Cu+, Cu+ and Ag+ with DMSO and Cl− is discussed, and a possible application of the Cu(II)DMSOH2OCl− system to processing precious metal residues is considered.
|Publication Type:||Journal Article|
|Murdoch Affiliation:||School of Mathematical and Physical Sciences|
|Copyright:||© 1989 Published by Elsevier Ltd.|
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