| 可见光驱动下罗丹明B自活化过硫酸盐降解双酚A |
| 摘要点击 2234 全文点击 613 投稿时间：2020-10-17 修订日期：2020-10-28 |
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| 中文关键词 光催化 染料 过二硫酸盐(PS) 自由基反应 非自由基反应 污水深度处理 |
| 英文关键词 photocatalysis dye persulfate(PS) radical reaction nonradical reaction advanced wastewater treatment |
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| 中文摘要 |
| 目前，过硫酸盐的常规活化方法研究已经逐步成熟，但因成本过高或催化剂难以回收和二次污染等问题严重制约了其实际应用.本研究通过构建染料自活化体系，探讨了染料在活化过二硫酸盐发生自脱色以及降解其他污染物方面的应用潜能.结果表明，染料在可见光照射下可活化过二硫酸盐，不仅可以实现染料自脱色，而且可以降解其他污染物，罗丹明B与双酚A的降解率最高分别可达80%和90%.这一过程即包含了自由基反应途径，也包含了非自由基反应途径.体系中所产生的活性氧化物质包含：超氧自由基、硫酸根自由基、羟基自由基和单线态氧.染料自脱色效率与染料初始浓度、PS投加量和溶液初始pH等有关，同时，染料及其他污染物的初始浓度对其他污染物的降解有很大影响.这为过二硫酸盐的活化提供了一种经济环保的新思路，在未来染料废水的处理中拥有广阔应用前景. |
| 英文摘要 |
| Although the activation method of permonosulfate has been gradually developed, its practical application is severely restricted by the high cost and difficult recovery of the catalyst, thereby resulting in secondary pollution. In this study, the application potential of self-decolorization of dyes and degradation of other pollutants through persulfate(PS) activation was examined by building a self-decolorization system. The results showed that the dyes could activate PS under visible light irradiation, which could realize not only the self-decolorization of dyes, but also the degradation of other pollutants. The degradation rates of rhodamine B and bisphenol A could reach 80% and 90%, respectively. This process included both free radical reaction pathways and nonradical reaction pathways. The active oxidants produced in the system included superoxide radicals, sulfate radicals, hydroxyl radicals, and singlet oxygen. The self-decolorization efficiency of dyes was related to the type of dyes, initial concentration of the dyes, dosage of PS, and initial pH of the solution. Meanwhile, the initial concentrations of the dyes and other pollutants had a great influence on the degradation of other pollutants. This study provides a new idea for economic and environmental protection in the PS activation method, and has broad application prospects in the treatment of printing and dyeing wastewater. |
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