Studies on the mechanism of transport of lanthanide ions through supported liquid membranes containing di-(2-ethylhexyl) phosphoric acid (D2EHPA) as a carrier |
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| Institution: | 1. Ulm University, Institute of Analytical and Bioanalytical Chemistry, Albert-Einstein-Allee 11, 89081 Ulm, Germany;2. Ulm University, Institute of Pharmacology and Toxicology, Albert-Einstein-Allee 11, 89081 Ulm, Germany;1. Dept. of Mathematical Sciences, University of Liverpool, Liverpool L69 7ZL, UK;2. Department of Physics, University of Ioannina, GR45110 Ioannina, Greece;1. Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;2. Department of Chemistry, The CUNY Energy Institute, The City College of New York, 160 Convent Ave, New York, NY 10031, USA;1. National Technology Initiative Center of Excellence in Advanced Manufacturing Technologies at Peter the Great St. Petersburg Polytechnic University, 195251, Polytechnicheskaya, 29, St. Petersburg, Russia;2. JSC “Klimov”, 194100, Kantemirovskaya, 11, St. Petersburg, Russia |
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| Abstract: | Praseodymium and holmium have been chosen as representative elements of light and heavy lanthanides, respectively, to characterize the extraction reactions of these elements that are responsible for their separation through supported liquid membranes (SLM) from nitrate media by using di-(2-ethylhexyl) phosphoric acid (D2EHPA) in kerosene as extractant. In the conditions studied, it has been demonstrated, the formation of two species that can be described as Ln(NO3)A2(HA)3 and LnA3(HA)2, where Ln represents the lanthanide cation and HA the acidic extractant D2EHPA. These results have been obtained by using both graphic and numeric treatments of solvent extraction data. The first one was based on the slope analysis, and the second one, on the use of LETAGROP-DISTR program. The formation constants and relative predominance of each species were calculated. A mechanism for the formation of given species was proposed. |
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