Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
579700 | Journal of Hazardous Materials | 2010 | 8 Pages |
Abstract
A selective method has been developed for the extraction chromatographic separation of BiIII with Versatic 10 coated on silanized silica gel (SSG). BiIII has been quantitatively extracted from 0.1 M acetate buffer at the range of pH 5.0-5.5. The result showed that the solution pH, influent volume, flow-rate and solution temperature would affect the sorption of BiIII. The sorbed BiIII was eluted with 0.1 M H2SO4. The extractor system has got good values of exchange capacity (1.42 meq. of H+ gâ1 of dry exchanger at 25 °C), break-through capacity (19.75 mg gâ1 at pH 5.5) and column efficiencies (300) with respect to BiIII. The positive value of ÎH (12.63 kJ molâ1) and ÎS (0.271 kJ molâ1 Kâ1) and negative value of ÎG (â68.241 kJ molâ1) indicated that the sorption process was endothermic, entropy gaining and spontaneous in nature. P.F. has been optimized at 76.4 ± 0.3 and the desorption constants Kdesorption (8 Ã 10â3) and Kâ²desorption (1.4 Ã 10â1) have been determined. Rf values and selectivity factors for diverse metal ions with respect to that of BiIII have been determined by ion-exchange paper chromatography. BiIII has been separated from synthetic mixtures containing its congeners and other metal ions associated with it in ores and alloy samples. The method was found effective for removal of BiIII from different water samples. A plausible mechanism for the extraction of BiIII has been suggested.
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Physical Sciences and Engineering
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Authors
Bhabatosh Mandal, Niladri Ghosh,