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Visible-Light-Driven Photocatalytic Degradation of Organic Water Pollutants Promoted by Sulfite Addition.
Environ Sci Technol. 2017 Nov 21; 51(22):13372-13379.ES

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 for the removal of water pollutants since sulfite is a waste from flue gas desulfurization process.

Authors+Show Affiliations

Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843, United States.Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843, United States.Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843, United States.Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843, United States.Chemical Engineering Program, Texas A&M University at Qatar , Doha, Qatar.Chemical Engineering Program, Texas A&M University at Qatar , Doha, Qatar.Department of Civil Engineering, Texas A&M University , College Station, Texas 77843, United States.Department of Mechanical Engineering, Texas A&M University , College Station, Texas 77843, United States.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29083909

Citation

Deng, Wei, et al. "Visible-Light-Driven Photocatalytic Degradation of Organic Water Pollutants Promoted By Sulfite Addition." Environmental Science & Technology, vol. 51, no. 22, 2017, pp. 13372-13379.
Deng W, Zhao H, Pan F, et al. Visible-Light-Driven Photocatalytic Degradation of Organic Water Pollutants Promoted by Sulfite Addition. Environ Sci Technol. 2017;51(22):13372-13379.
Deng, W., Zhao, H., Pan, F., Feng, X., Jung, B., Abdel-Wahab, A., Batchelor, B., & Li, Y. (2017). Visible-Light-Driven Photocatalytic Degradation of Organic Water Pollutants Promoted by Sulfite Addition. Environmental Science & Technology, 51(22), 13372-13379. https://doi.org/10.1021/acs.est.7b04206
Deng W, et al. Visible-Light-Driven Photocatalytic Degradation of Organic Water Pollutants Promoted By Sulfite Addition. Environ Sci Technol. 2017 Nov 21;51(22):13372-13379. PubMed PMID: 29083909.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Visible-Light-Driven Photocatalytic Degradation of Organic Water Pollutants Promoted by Sulfite Addition. AU - Deng,Wei, AU - Zhao,Huilei, AU - Pan,Fuping, AU - Feng,Xuhui, AU - Jung,Bahngmi, AU - Abdel-Wahab,Ahmed, AU - Batchelor,Bill, AU - Li,Ying, Y1 - 2017/11/08/ PY - 2017/10/31/pubmed PY - 2018/6/12/medline PY - 2017/10/31/entrez SP - 13372 EP - 13379 JF - Environmental science & technology JO - Environ. Sci. Technol. VL - 51 IS - 22 N2 - 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 for the removal of water pollutants since sulfite is a waste from flue gas desulfurization process. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/29083909/Visible_Light_Driven_Photocatalytic_Degradation_of_Organic_Water_Pollutants_Promoted_by_Sulfite_Addition_ L2 - https://dx.doi.org/10.1021/acs.est.7b04206 DB - PRIME DP - Unbound Medicine ER -