| 太阳能热活化过硫酸盐降解染料罗丹明B的效能 |
| 摘要点击 2840 全文点击 711 投稿时间：2020-07-20 修订日期：2020-08-21 |
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| 中文关键词 太阳能热活化 过硫酸盐 罗丹明B 高级氧化 硫酸根自由基(SO4-·) |
| 英文关键词 solar thermal activation persulfate rhodamine B advanced oxidation sulfate radical(SO4-·) |
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| 中文摘要 |
| 在基于硫酸根自由基的高级氧化技术中，热活化被证实是最为有效的过硫酸盐（PS）活化方法之一，而利用蕴涵巨大热能的太阳能来活化PS降解污染物具有十分广阔的应用前景.对此，本研究通过构建太阳能集热反应装置，系统地探究了太阳能热活化PS降解典型染料有机物罗丹明B的效能及机制，并深入地探讨了太阳辐照强度、PS浓度、底物浓度、溶液初始pH及背景水质条件对罗丹明B降解效率的影响.结果表明，太阳能热活化PS体系具有十分突出的有机污染物氧化降解性能，反应120 min对于罗丹明B的去除率和矿化率分别高达94%和60%.该系统的处理效率受太阳辐照强度的影响较为明显，晴天最好，阴天次之，雨天最差；增大PS浓度或降低底物初始浓度，并调节溶液初始pH为中性可以显著提高系统的处理效率.SO4-·和·OH是反应体系中主要存在的活性氧化性物质，其中·OH在降解过程中起主要作用. |
| 英文摘要 |
| In advanced oxidation technology based on sulfate radicals, thermal activation is one of the most effective methods for persulfate (PS) activation, with broad application potential for the use of solar energy to activate PS to degrade pollutants. In this study, the efficiency and mechanism of degradation of rhodamine B by solar thermally activated PS were investigated using a solar collector reactor. The effects of solar irradiation intensity, PS concentration, substrate concentration, initial pH of the solution, and background water quality on the degradation efficiency of rhodamine B were examined. The results show that the solar thermally activated PS system has outstanding oxidation degradation performance with respect to organic pollutants. The removal rate and mineralization rate of rhodamine B reached 94% and 60%, respectively, after a 120 min reaction time. The treatment efficiency of the system was notably affected by the solar radiation intensity, with performance ranked in the order sunny days > cloudy days > rainy days. The treatment efficiency of the system could be significantly improved by increasing the concentration of PS or reducing the initial concentration of the substrate, and by adjusting the initial pH of the solution to neutral. SO4-·and·OH are the main active oxidants in the reaction system, and·OH plays a major role in the degradation process. |
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