materials Article Pertechnetate/Perrhenate Surface Complexation on Bamboo Engineered Biochar Martin Da ˇno 1,* , Eva Viglašová 1,2,* , Karel Štamberg 1, Michal Galamboš 2 and Dušan Galanda 2 1 Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Bˇrehová 7, 115 19 Prague, Czech Republic;
[email protected] 2 Department of Nuclear Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska Dolina, Ilkoviˇcova6, 842 15 Bratislava, Slovakia;
[email protected] (M.G.);
[email protected] (D.G.) * Correspondence: martin.dano@fjfi.cvut.cz (M.D.);
[email protected] (E.V.); Tel.: +420-2-2435-8230 (M.D.); +421-2-9014-2132 (E.V.) Abstract: The work deals with the evaluation of biochar samples prepared from Phyllostachys Viridiglaucescens bamboo. This evaluation consists of the characterization of prepared materials’ structural properties, batch and dynamic sorption experiments, and potentiometric titrations. The 99m − batch technique was focused on obtaining basic sorption data of TcO4 on biochar samples − including influence of pH, contact time, and Freundlich isotherm. ReO4 , which has very similar 99m − chemical properties to TcO4 , was used as a carrier in the experiments. Theoretical modeling of titration curves of biochar samples was based on the application of surface complexation models, namely, so called Chemical Equilibrium Model (CEM) and Ion Exchange Model (IExM). In this case it is assumed that there are two types of surface groups, namely, the so-called layer and edge sites. The dynamic experimental data of sorption curves were fitted by a model based on complementary error function erfc(x).