Photocatalytic reduction of chlorate in aqueous TiO2 suspension with hole scavenger under simulated solar light

This work investigates photocatalytic reduction of aqueous chlorate by using commercial P25 TiO2 in the presence of hole scavengers under simulated solar light. It compares the photocatalytic ability of P25 TiO2 to reduce chlorate in the presence or absence of a hole scavenger (methanol) with that of bismuth oxyhalides (BiOBr, TiO2-BiOBr, BiOCl, TiO2-BiOCl, and BiOI). Bismuth oxyhalides have more interest as promising photocatalysts because they have a narrow band gap and are more responsive to visible light. However, in this study, P25 TiO2 was a more effective photocatalyst for chlorate reduction in the presence of methanol than bismuth oxyhalides. Also, this study examines the effectiveness of methanol, ethanol, and formate as hole scavengers during chlorate reduction. The presence of methanol enhanced chlorate reduction more than that of formate and ethanol. Finally, this work estimates the impacts of operating parameters such as photocatalyst dose, initial chlorate concentration, solution pH, methanol concentration, and light intensity on chlorate removal and studies the reaction mechanism for chlorate reduction in the system of TiO2/chlorate/methanol (photocatalyst/contaminant/reagent) under simulated solar light. The highest chlorate removal of 97.5% was achieved using 1 g/L of TiO2 with initial chlorate concentration of 0.012 mM and methanol concentration of 2 mM at the pH of 5.4 after 180 min of radiation. The major product of chlorate photoreduction was chloride ion.