Extraction of fission palladium by Aliquat 336 and electrochemical studies on direct recovery from ionic liquid phase |
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Authors: | P. Giridhar K.A. VenkatesanT.G. Srinivasan P.R. Vasudeva Rao |
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Affiliation: | Fuel Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India |
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Abstract: | The wide electrochemical window and ion exchange properties of a room-temperature ionic liquid (RTIL) have been exploited for the extraction of palladium from nitric acid medium into ionic liquid phase — followed by direct electrodeposition of the metal from the organic phase. Extraction of palladium by commercial Aliquat 336 ionic liquids, tri-n-octylmethylammonium chloride (TOMAC) and tri-n-octylmethylammonium nitrate (TOMAN), was studied as a function of [HNO3], [NO3−] and [TOMAN]. The distribution ratio (DPd(II)) of palladium in TOMAN increased with an increase in the concentration of nitric acid and passed through a maximum at 1.0 M nitric acid. In contrast, the DPd(II) value of palladium in TOMAC decreased continuously with an increase in the concentration of nitric acid. Substantial amounts of water and nitric acid were also co-extracted into the organic phase with palladium. |
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Keywords: | Ionic liquids Aliquat 336 Palladium extraction Cyclic voltammetry Electrodeposition |
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