Sorption of Palladium(II) from Nitric Acid Solutions by Silica Modified with Amino Groupsстатья

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Дата последнего поиска статьи во внешних источниках: 8 января 2017 г.

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[1] Sorption of palladium(ii) from nitric acid solutions by silica modified with amino groups / E. V. Volchkova, I. V. Boryagina, T. M. Buslaeva et al. // Russian Journal of Non-Ferrous Metals. — 2016. — Vol. 57, no. 5. — P. 405–411. The sorption of Pd(II), Ag(I), and Cu(II) from nitric acid solutions with silicas chemically modified with γ-(aminopropyl)trietoxysiloxane is investigated. It is assumed based on the investigation of solid phases by IR and X-ray photoelectron spectroscopy and thermogravimetry that the following processes occur during the sorption of palladium from nitric acid solutions: coordination of palladium atoms to nitrogen atoms of the functional group, interaction of palladium ions with the silica matrix, and the formation of polynuclear complexes. It is proposed to use a 5% solution of thiourea in 0.1 M HCl. It is determined that the establishment time of constant values of sorption in static conditions is as follows, min: 10 for Ag(I), 20 for Cu(II), and 30 for Pd(II). A sorbability series of ions from 2 M HNO3 in identical conditions is as follows: AAg(I) > APd(II) @ ACu(II). Silver ions are not sorbed from solutions with the concentration of HNO3 < 1 M, which will create prerequisites for the separation of ions. [ DOI ]

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