Uranium binding by biochar fibres derived from Luffa cylindrica after controlled surface oxidation
SourceJournal of Radioanalytical and Nuclear Chemistry
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Controlled surface modification of biochar fibres derived from Luffa cylindrica sponges has been carried out by nitric acid and the degree of oxidation could be controlled by changing the acid concentration or the reaction time. The extent of surface oxidation has been quantified by acid–base titration and FTIR-spectroscopy. Furthermore, uranium binding has been studied as a function of various parameters and the experimental results show that even under strong acidic conditions the relative sorption is above 80 % and the sorption capacity of the biochar fibres for U(VI) at pH 3 is qmax = 92 g kg−1. © 2016, Akadémiai Kiadó, Budapest, Hungary.