A comparison of the degradation of benzothiazole in the UV/H2O2 and UV/K2s2o8 systems: degradation processes and degradation mechanisms.

IF 2 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Lei Chen, Yun Wang, Haiyang Shao, Chengkai Mao, Minghong Wu, Gang Xu
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引用次数: 0

Abstract

The increasing presence of benzothiazole (BTH) in industrial wastewater poses significant environmental and health risks due to its persistence and toxicity. This study compares UV/persulfate (UV/K₂S₂O₈) and UV/H₂O₂ systems for benzothiazole (BTH) degradation, revealing that UV/K₂S₂O₈ achieves complete BTH removal (100%, 0.189 min-1) versus 85% (0.092 min-1) for UV/H₂O₂ under identical conditions. Radical scavenging experiments and LC-MS analysis demonstrate sulfate radicals outperform hydroxyl radicals in oxidizing BTH heterocyclic structure, reducing intermediates by 63% (quantified via peak area ratios). pH-dependent kinetics show UV/K₂S₂O₈ maintains efficacy (90-100% removal) across pH 3-9, while UV/H₂O₂ efficiency drops to 58% at pH > 7. Practical validation in river water confirms UV/K₂S₂O₈ robustness (98% BTH degradation), positioning it as a scalable, energy-efficient solution for refractory pollutant treatment. The results showed that the oxidant concentration and pH affected the degradation rate of BTH by changing the free radical concentration, and the UV/ K2S2O8 was demonstrated to be able to achieve efficient removal of pollutants in complex environmental matrices. Free radical scavenging experiments and liquid chromatography-mass spectrometry analysis confirm that sulfate radicals are more effective than hydroxyl radicals in oxidizing and degrading BTH, enabling rapid, efficient, and environmentally friendly degradation of pollutants. This is mainly due to the higher redox potential of sulfate radicals (2.8-3.1V) compared to hydroxyl radicals (2.01V), resulting in the generation of fewer intermediates. Compared to UV/H2O2, UV/K2S2O8 is a more effective, cleaner, and energy-saving method for pollutant removal in various complex environmental matrices.

UV/H2O2和UV/K2s2o8体系对苯并噻唑的降解比较:降解过程和降解机理。
苯并噻唑(BTH)在工业废水中的存在日益增加,由于其持久性和毒性,造成了重大的环境和健康风险。本研究比较了UV/过硫酸盐(UV/K₂S₂O₈)和UV/H₂O₂体系对苯并噻唑(BTH)的降解作用,发现在相同的条件下,UV/K₂S₂O₈可以完全去除BTH (100%, 0.189 min-1),而UV/H₂O₂可以去除85% (0.092 min-1)。自由基清除实验和LC-MS分析表明,硫酸盐自由基在氧化BTH杂环结构方面优于羟基自由基,减少中间产物63%(通过峰面积比量化)。pH依赖动力学表明,UV/K₂S₂O₈在pH值3-9范围内保持效率(90-100%去除),而在pH值bbb7时,UV/H₂O₂效率降至58%。在河水中的实际验证证实了UV/K₂S₂O₈坚固性(98% BTH降解),将其定位为难降解污染物处理的可扩展节能解决方案。结果表明,氧化剂浓度和pH值通过改变自由基浓度来影响BTH的降解速率,UV/ K2S2O8能够在复杂的环境基质中实现对污染物的高效去除。自由基清除实验和液相色谱-质谱分析证实,硫酸盐自由基在氧化和降解BTH方面比羟基自由基更有效,能够快速、高效、环保地降解污染物。这主要是由于硫酸盐自由基(2.8-3.1V)比羟基自由基(2.01V)具有更高的氧化还原电位,导致中间体生成较少。与UV/H2O2相比,UV/K2S2O8是一种更有效、更清洁、更节能的方法,可用于各种复杂环境基质中的污染物去除。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Environmental Technology
Environmental Technology 环境科学-环境科学
CiteScore
6.50
自引率
3.60%
发文量
0
审稿时长
4 months
期刊介绍: Environmental Technology is a leading journal for the rapid publication of science and technology papers on a wide range of topics in applied environmental studies, from environmental engineering to environmental biotechnology, the circular economy, municipal and industrial wastewater management, drinking-water treatment, air- and water-pollution control, solid-waste management, industrial hygiene and associated technologies. Environmental Technology is intended to provide rapid publication of new developments in environmental technology. The journal has an international readership with a broad scientific base. Contributions will be accepted from scientists and engineers in industry, government and universities. Accepted manuscripts are generally published within four months. Please note that Environmental Technology does not publish any review papers unless for a specified special issue which is decided by the Editor. Please do submit your review papers to our sister journal Environmental Technology Reviews at http://www.tandfonline.com/toc/tetr20/current
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