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

• DOI: 10.1021/acs.est.7b04206
• Publication Date: 2017-10-30T20:56:21Z
• Authors: Wei Deng; Huilei Zhao; Fuping Pan; Xuhui Feng; Bahngmi Jung; Ahmed Abdel-Wahab; Bill Batchelor; Ying Li
• Keywords: Photodegradation; Bisulfite; Methyl orange; Degradation; Advanced oxidation process; Visible spectrum

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