Abstract
Adsorption of thorium on the metal oxides impregnated silica has been investigated. The sorption kinetics revealed the trend in rate of Th sorption as iron oxide > chromium oxide > vanadium oxide. The sorption capacities were evaluated from Langmuir isotherm with the trend in the strength of the bonding chromium oxide > iron oxide > vanadium oxide. The sorption behavior was also analyzed comparing Dubinin–Radushkevich, Temkin and Freundlich isotherm. Oxalic acid was found to strip thorium effectively from sorbent. Chromium oxide–silica was found to be the most efficient and selective sorbent with co-sorption of Ag, Bi, Ga, In and Tl.
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