|
|||||
|
|
Extraction of palladium with thiacalix[4]arenes from nitric acid nitrate-nitrite solutions |
|
| Authors: | V G Torgov T V Us T M Korda G A Kostin V I Kal’chenko |
| Institution: | 1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent??eva 3, Novosibirsk, 630090, Russia 2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia 3. Institute of Organic Chemistry of the National Academy of Sciences of Ukraine, Murmanskaya ul. 5, Kiev, 02094, Ukraine |
| Abstract: | Calix4]arene 1, thiacalix4]arenes 2(LH4), and calix4]arenethioether 3 were compared in palladium extraction from nitric acid solutions; D Pd for 2 was shown to be 2?C3 orders of magnitude larger than for 1 at pH > 3 (comparable with 3) because of cation-exchange and coordination extraction of palladium. It was shown by extraction methods and IR spectroscopy that thiacalixarenes 2 extract complex species Pd n L m H4 ? 2n ] (m = 1, n = 1 and 2) and (PdA2) n L m H4] (A = m = 1, n = 1?C4) from nitric acid solutions at pH 3. Extraction constants for these palladium species that satisfactorily describe experimental data were calculated. As distinct from 3, thiacalixarenes 2 are promising for the combined extraction of palladium and silver from alkaline solutions and the selective extraction of fission palladium from nitric acid solutions. Phosphorylated at the upper rim thiacalixarenes 2 can be considered as bifunctional extractants for the separation of fission radionuclides. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |