Abstract
Silica chemically modified with mercaptopropyl groups (MPS) is usable in copper(II) recovery from chloride and nitrate solutions, affording a recovery factor of 99%. With silica modified with dipropyl disulfide groups (DPDSS), the largest copper(II) recovery factor is 50% and is attained at pH 6–7. Copper in its mercaptopropyl and dipropyl disulfide complexes on the silica surface is in the oxidation states +1 and +2, respectively. Coordinatively unsaturated copper(I) complexes form on the MPS surface, and their amount depends on the quantity of functional groups grafted to the silica surface. These surface complexes of copper(I) can coordinate with Michler’s thioketone molecules from aqueous ethanol to yield intensely red mixed-ligand copper(I) complexes on the MPS or DPDSS surface (in the latter case, after copper(II) reduction to copper(I) with ascorbic acid). The diffuse reflectance spectrum of the mixed-ligand complexes shows a band at 520 nm.
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Original Russian Text © V.N. Losev, E.V. Buiko, O.V. Buiko, A.K. Trofimchuk, E.A. Tsiganovich, 2009, published in Zhurnal Neorganicheskoi Khimii, 2009, Vol. 54, No. 1, pp. 82–86.
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Losev, V.N., Buiko, E.V., Buiko, O.V. et al. Formation of Copper(I) mixed-ligand complexes with mercaptopropyl or dipropyl disulfide groups covalently bonded to the silica surface and Michler’s thioketone. Russ. J. Inorg. Chem. 54, 81–85 (2009). https://doi.org/10.1134/S003602360901015X
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DOI: https://doi.org/10.1134/S003602360901015X