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Russian Journal of Non-Ferrous Metals

, Volume 57, Issue 5, pp 405–411 | Cite as

Sorption of palladium(II) from nitric acid solutions by silica modified with amino groups

  • E. V. VolchkovaEmail author
  • I. V. Boryagina
  • T. M. Buslaeva
  • A. A. Ablizov
  • N. M. Bodnar
  • E. V. Ehrlich
Metallurgy of Rare and Noble Metals

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: A Ag(I) > A Pd(II)A Cu(II). Silver ions are not sorbed from solutions with the concentration of HNO3 < 1 M, which will create prerequisites for the separation of ions.

Keywords

sorption palladium silver copper chemically modified silica gels separation recovery 

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© Allerton Press, Inc. 2016

Authors and Affiliations

  • E. V. Volchkova
    • 1
    Email author
  • I. V. Boryagina
    • 2
  • T. M. Buslaeva
    • 1
  • A. A. Ablizov
    • 1
  • N. M. Bodnar
    • 1
  • E. V. Ehrlich
    • 3
  1. 1.Moscow University of TechnologyMoscowRussia
  2. 2.OAO Rytvin Research-and-Production Complex “Supermetall”Solnechnogorsk raion, Moscow oblastRussia
  3. 3.Moscow State UniversityMoscowRussia

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