Mineralization of Riluzole by Heterogeneous Fenton Oxidation Using Natural Iron Catalysts

Fenton (H2O2/Fe2+) system is a simple and efficient advanced oxidation technology (AOT) for the treatment of organic micropollutants in water soil. However, it suffers from some drawbacks including high amount catalyst, acid pH requirement, sludge formation slow regeneration Fe2+ ions. If these are surmounted, can be best choice AOT removal persistent organics In this work, was attempted to replace homogeneous catalyst with heterogeneous natural iron-based decomposition H2O2 into oxidative radical species, mainly hydroxyl (HO•) hydroperoxyl radicals (HO2•). The hematite-rich (α-Fe2O3) contains nonnegligible magnetite (Fe3O4) indicating coexistence Fe (III) Fe(II) species. A pseudo-first order kinetics determined by solid rate constant increasing dose. catalytic presence Fe-based confirmed hydroxylation benzoic salicylic acid. catalyst/H2O2 applied degradation riluzole water. It demonstrated that smaller particle size larger its surface area greater activity towards radicals. occur at all levels range 3.0–12.0 efficiency than alone, function any without need control addition chemicals. An improvement observed under UV irradiation both systems. results chromatography analysis demonstrate starts opening triazole ring releasing nitrate, sulfate, fluoride reuse after heat 500 °C heat-treated retained an >90% five cycles. sources iron, as Fenton-like system, appropriate replacement catalyst. heat-treatment represents additional advantage using