Visible-Light-Driven Photocatalytic Degradation of Organic Water Pollutants Promoted by Sulfite Addition

Environmental Science & Technology
Wei DengYing Li

Abstract

Solar-driven heterogeneous photocatalysis has been widely studied as a promising technique for degradation of organic pollutants in wastewater. Herein, we have developed a sulfite-enhanced visible-light-driven photodegradation process using BiOBr/methyl orange (MO) as the model photocatalyst/pollutant system. We found that the degradation rate of MO was greatly enhanced by sulfite, and the enhancement increased with the concentration of sulfite. The degradation rate constant was improved by 29 times in the presence of 20 mM sulfite. Studies using hole scavengers suggest that sulfite radicals generated by the reactions of sulfite (sulfite anions or bisulfite anions) with holes or hydroxyl radicals are the active species for MO photodegradation using BiOBr under visible light. In addition to the BiOBr/MO system, the sulfite-assisted photocatalysis approach has been successfully demonstrated in BiOBr/rhodamine B (RhB), BiOBr/phenol, BiOI/MO, and Bi2O3/MO systems under visible light irradiation, as well as in TiO2/MO system under simulated sunlight irradiation. The developed method implies the potential of introducing external active species to improve photodegradation of organic pollutants and the beneficial use of air pollutants ...Continue Reading

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Citations

Oct 27, 2018·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Prashantha Kumar T K M, Ashok Kumar S K
Jul 10, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Antonio C RovedaDaniel R Cardoso
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Jan 28, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Khurram ShahzadAziz Ur Rehman
Jul 31, 2021·Journal of Hazardous Materials·Ying CaiJinhong Fan
Sep 17, 2019·The Journal of Organic Chemistry·Zahra Bazyar, Mona Hosseini-Sarvari

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