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Comparison of UV/H2O2, UV/PMS, and UV/PDS in Destruction of Different Reactivity Compounds and Formation of Bromate and Chlorate
Frontiers in Chemistry ( IF 5.5 ) Pub Date : 2020-08-18 , DOI: 10.3389/fchem.2020.581198
Ying-Hong Guan , Jin Chen , Li-Jun Chen , Xin-Xin Jiang , Qiang Fu

In this study, we compared the decontamination kinetics of various target compounds and the oxidation by-products (bromate and chlorate) of PMS, PDS, and H2O2 under UV irradiation (UV/PMS, UV/PDS, UV/H2O2). Probes of different reactivity with hydroxyl and sulfate radicals, such as benzoic acid (BA), nitrobenzene (NB), and trichloromethane (TCM), were selected to compare the decontamination efficiency of the three oxidation systems. Experiments were performed under acidic, neutral, and alkaline pH conditions to obtain a full-scale comparison of UV/peroxides. Furthermore, the decontamination efficiency was also compared in the presence of common radical scavengers in water bodies [bicarbonate, carbonate, and natural organic matter (NOM)]. Finally, the formation of oxidation by-products, bromate, and chlorate, was also monitored in comparison in pure water and tap water. Results showed that UV/H2O2 showed higher decontamination efficiency than UV/PDS and UV/PMS for BA degradation while UV/H2O2 and UV/PMS showed better decontamination performance than UV/PDS for NB degradation under acidic and neutral conditions. UV/PMS was the most efficient among the three processes for BA and NB degradation under alkaline conditions, while UV/PDS was the most efficient for TCM degradation under all pH conditions. In pure water, both bromate and chlorate were formed in UV/PDS, small amounts of bromate and rare chlorate were observed in UV/PMS, and no detectable bromate and chlorate were formed in UV/H2O2. In tap water, no bromate and chlorate were detectable for all three systems.



中文翻译:

UV / H2O2,UV / PMS和UV / PDS在破坏不同反应性化合物以及形成溴酸盐和氯酸盐中的比较

在这项研究中,我们比较了各种目标化合物的去污动力学以及在紫外线(UV / PMS,UV / PDS,UV / H 2)下PMS,PDS和H 2 O 2的氧化副产物(溴酸盐和氯酸盐)Ø 2)。选择了与羟基和硫酸根自由基(如苯甲酸(BA),硝基苯(NB)和三氯甲烷(TCM))具有不同反应性的探针,以比较三种氧化系统的去污效率。在酸性,中性和碱性pH条件下进行实验,以获得紫外线/过氧化物的全面比较。此外,还比较了水体中常见的自由基清除剂[碳酸氢盐,碳酸盐和天然有机物(NOM)]的去污效率。最后,还比较了纯水和自来水中氧化副产物溴酸盐和氯酸盐的形成。结果表明,UV / H 2 O 2在酸性和中性条件下,对BA降解显示出比UV / PDS和UV / PMS更高的去污效率,而对于NB降解,UV / H 2 O 2和UV / PMS显示出比UV / PDS更好的去污性能。在碱性条件下,BA / NB降解的三个过程中,UV / PMS效率最高,而在所有pH条件下,UV / PDS对TCM降解的效率最高。在纯水中,在UV / PDS形成两个溴酸盐及氯酸盐,在UV / PMS观察溴酸盐和稀有氯酸盐少量,并且形成没有可检测的溴酸盐及氯酸盐在UV / H 2 ö 2.在自来水,没有三种系统均可检测到溴酸盐和氯酸盐。

更新日期:2020-09-25
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