Palladium and silver extraction with thiacalix[4]arenes and their acyclic analogs from carbonate and ammonia-carbonate solutions

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• 作者：V. G. Torgov (1)
  G. A. Kostin (1) (2)
  T. V. Us (1)
  T. M. Korda (1)
  A. B. Drapailo (3)
  
  1. Nikolaev Institute of Inorganic Chemistry ; Siberian Branch ; Russian Academy of Sciences ; pr. Akademika Lavrent鈥檈va 3 ; Novosibirsk ; 630090 ; Russia
  2. Novosibirsk State University ; ul. Pirogova 2 ; Novosibirsk ; 630090 ; Russia
  3. Institute of Organic Chemistry ; National Academy of Sciences of Ukraine ; Murmanskaya ul. 5 ; Kiev ; 02094 ; Ukraine
  
• 刊名：Russian Journal of Inorganic Chemistry
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：60
• 期：3
• 页码：372-378
• 全文大小：628 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Inorganic Chemistry
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1531-8613

文摘

A quantitative comparison of palladium and silver extraction with p-tert-butylthiacalix[4]arene (TCA) from nitric acid, carbonate, ammonia-carbonate, and ammonia solutions was carried out. It was shown that TCA under optimal conditions can be used for concurrent extraction of palladium and silver from carbonate systems of CARBEX process, selective recovery of palladium from nitric acid solutions, and selective silver extraction from ammonia-carbonate solutions. Metal distribution ratios and effective extraction constants decrease when the complex-forming ability of aqueous phase rises (Na2CO3 > NH4HCO3). The ammonia complexation of Ag+ is determining factor for silver, solution pH plays a certain role for palladium due to formation of hydroxo complexes.