Visible-Light-Driven Photocatalytic Degradation of Organic Water Pollutants Promoted by Sulfite Addition,Environmental Science & Technology

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Visible-Light-Driven Photocatalytic Degradation of Organic Water Pollutants Promoted by Sulfite Addition
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1021/acs.est.7b04206
Wei Deng ₁ , Huilei Zhao ₁ , Fuping Pan ₁ , Xuhui Feng ₁ , Bahngmi Jung ₂ , Ahmed Abdel-Wahab ₂ , Bill Batchelor ₃ , Ying Li ₁

Affiliation

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.

中文翻译：

可见光驱动的亚硫酸盐添加促进有机水污染物的降解

太阳能驱动的非均相光催化技术已被广泛研究为降解废水中有机污染物的一种有前途的技术。在这里，我们已经开发了使用BiOBr /甲基橙（MO）作为模型光催化剂/污染物系统的亚硫酸盐增强的可见光驱动的光降解方法。我们发现，亚硫酸盐大大提高了MO的降解速率，并且随着亚硫酸盐浓度的增加而提高。在20 mM亚硫酸盐的存在下，降解速率常数提高了29倍。使用空穴清除剂的研究表明，由亚硫酸根（亚硫酸根阴离子或亚硫酸氢根阴离子）与空穴或羟基自由基反应生成的亚硫酸根自由基是在可见光下使用BiOBr进行MO光降解的活性物质。除了BiOBr / MO系统，可见光照射下的₂ O ₃ / MO系统，以及模拟阳光照射下的TiO ₂ / MO系统。由于亚硫酸盐是烟道气脱硫过程中的废物，因此开发的方法暗示了引入外部活性物质改善有机污染物光降解的潜力，以及有益地利用空气污染物去除水污染物的潜力。

更新日期：2017-11-08

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