Visible-Light-Driven Photocatalytic Degradation of Organic Water Pollutants Promoted by Sulfite Addition
| Autor: | Bahngmi Jung, Ying Li, Huilei Zhao, Ahmed Abdel-Wahab, Xuhui Feng, Wei Deng, Bill Batchelor, Fuping Pan |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Photolysis
Light 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Catalysis 0104 chemical sciences Bisulfite chemistry.chemical_compound Sulfite chemistry Rhodamine B Photocatalysis Methyl orange Sulfites Environmental Chemistry Phenol Water Pollutants 0210 nano-technology Photodegradation Visible spectrum |
| Zdroj: | Environmental Science & Technology. 51:13372-13379 |
| ISSN: | 1520-5851 0013-936X |
| Popis: | 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... |
| Databáze: | OpenAIRE |
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