5 years ago

UV-LED/ilmenite/persulfate for azo dye mineralization: The role of sulfate in the catalyst deactivation

UV-LED/ilmenite/persulfate for azo dye mineralization: The role of sulfate in the catalyst deactivation
This work investigates the effect of UV-LED on the persulfate (PS) activation with natural ilmenite (FeTiO3) in the oxidation of azo dye Disperse Blue 3 (DB3). The high induction period and the scarce ability of this mineral to activate PS can be overcome by using UV irradiation to increase the SO4 generation via photoreduction of Fe(III) to Fe(II) on the ilmenite surface, main responsible of SO4 formation in iron-based catalysis. The effect of several operating conditions such as persulfate dose (20–100% of the theoretical stoichiometric amount), reaction temperature (30–70°C) and mineral concentration 320mgL−1 has been studied. Under optimum conditions (320mgL−1of ilmenite, pH0: 3, using 100% of stoichiometric amount of PS at 70°C under UV-LED radiation) more than 95% TOC reduction and 92% PS decomposition were reached after 180min. The progressive deactivation of FeTiO3 through successive experiments can be explained, according to density functional theory (DFT) calculations, by the formation of a passivation layer due to adsorption of SO4 2− on the FeTiO3 surface.

Publisher URL: www.sciencedirect.com/science

DOI: S092633731730721X

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