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

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• 作者：E. V. Volchkova ; I. V. Boryagina ; T. M. Buslaeva…
• 关键词：sorption ; palladium ; silver ; copper ; chemically modified silica gels ; separation ; recovery
• 刊名：Russian Journal of Non-Ferrous Metals
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：57
• 期：5
• 页码：405-411
• 全文大小：487 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Metallic Materials
  Russian Library of Science
  
• 出版者：Allerton Press, Inc. distributed exclusively by Springer Science+Business Media LLC
• ISSN：1934-970X
• 卷排序：57

文摘

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.