Sorption of palladium(II) from nitric acid solutions by silica modified with amino groups
- Authors: Volchkova E.V.1, Boryagina I.V.2, Buslaeva T.M.1, Ablizov A.A.1, Bodnar N.M.1, Ehrlich E.V.3
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Affiliations:
- Moscow University of Technology
- OAO Rytvin Research-and-Production Complex “Supermetall”
- Moscow State University
- Issue: Vol 57, No 5 (2016)
- Pages: 405-411
- Section: Metallurgy of Rare and Noble Metals
- URL: https://journals.rcsi.science/1067-8212/article/view/225991
- DOI: https://doi.org/10.3103/S1067821216050175
- ID: 225991
Cite item
Abstract
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.
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About the authors
E. V. Volchkova
Moscow University of Technology
Author for correspondence.
Email: volchkovaev@bk.ru
Russian Federation, Moscow, 119571
I. V. Boryagina
OAO Rytvin Research-and-Production Complex “Supermetall”
Email: volchkovaev@bk.ru
Russian Federation, pos. Andreevka, Solnechnogorsk raion, Moscow oblast, 141551
T. M. Buslaeva
Moscow University of Technology
Email: volchkovaev@bk.ru
Russian Federation, Moscow, 119571
A. A. Ablizov
Moscow University of Technology
Email: volchkovaev@bk.ru
Russian Federation, Moscow, 119571
N. M. Bodnar
Moscow University of Technology
Email: volchkovaev@bk.ru
Russian Federation, Moscow, 119571
E. V. Ehrlich
Moscow State University
Email: volchkovaev@bk.ru
Russian Federation, Moscow, 119991