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Electrochemical Behavior of U(VI) in Imidazolium Ionic Liquid Medium Containing Tri‐n‐butyl Phosphate and Chloride Ion and Spectroscopic Characterization of Uranyl Species
Author(s) -
Krishna Gajula Murali,
Suneesh Asokan Sudha,
Kumaresan Radhakrishnan,
Venkatesan Konda Athmaram,
Antony Malpan Pailo
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701139
Subject(s) - ionic liquid , uranyl , chloride , chemistry , inorganic chemistry , electrochemistry , raman spectroscopy , ion , nuclear chemistry , electrode , catalysis , organic chemistry , physics , optics
The electrochemical behaviour of UO 2 (NO 3 ) 2 in a solution of tri‐n‐butyl phosphate (TBP) present in 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide (C 4 mimNTf 2 ) ionic liquid was studied in the presence of chloride ion, to understand the decomplexation behaviour of uranyl ion (UO 2 2+ )from TBP coordination, and to examine the possibility of underpotential reduction of UO 2 2+ . The mole ratio of U : NO 3 : TBP : Cl in ionic liquid solution was varied from 1 : 2 : 2 : 0to 1 : 2 : 2 : 6 in the study. The cyclic voltammogram of UO 2 (NO 3 ) 2 present in TBP/C 4 mimNTf 2 , was compared with the voltammograms obtained in the presence of 1‐butyl‐3‐methylimidazolium chloride (C 4 mimCl). The current density of UO 2 2+ reduction increased with increase in the chloride content of ionic liquid phase, which was attributed to the formation of chloro complexes of uranium (VI), and these chloro complexes were found to undergo facile and favourable reduction at the working electrode. The diffusion coefficient of uranylspecies was determined at various concentrations of chloride ion and the nature of uranylspecies diffusing at the working electrode at various mole ratios of U : NO 3 : TBP : Cl was characterized by UV–Visible, ATR‐FTIR and Raman spectroscopy.