Nitroaromatic hydrocarbon ozonation in water. 1. Single ozonation
Nitroaromatic hydrocarbon ozonation in water. 1. Single ozonation
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DOI：
10.1021/ie9704253
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发表时间：
1998-01-01
影响因子：
4.2
通讯作者：
Alonso, MA
中科院分区：
文献类型：
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作者：
Beltran, FJ;Encinar, JM;Alonso, MA
在不同实验条件（臭氧进料速率、pH值、温度、羟基自由基清除剂）下，对两种硝基芳香烃（硝基苯和2,6 - 二硝基甲苯）的单一臭氧化进行了研究。不存在羟基自由基清除剂、pH值为7 - 9以及温度低于30℃是去除硝基芳香烃的最佳条件。由于羟基自由基反应的重要性，在天然水中的去除率远低于在实验室超纯水中观察到的去除率。已发现20℃时臭氧与硝基芳香烃之间直接反应的速率常数低于6 M⁻¹ s⁻¹。超过99%的硝基芳香烃去除是由于羟基自由基氧化。因此，硝基芳香烃的单一臭氧化可归类为一种真正的高级氧化技术。在硝基苯和2,6 - 二硝基甲苯的单一臭氧化过程中分别鉴定出的硝基酚（对臭氧和羟基自由基具有高反应活性的化合物）以及2,6 - 二硝基苯甲醛是单一臭氧化的一些初级中间产物。
Single ozonation of two nitroaromatic hydrocarbons (nitrobenzene and 2,6-dinitrololuene) under different experimental conditions (ozone feed rate, pH, temperature, hydroxyl radical scavengers) has been studied. The absence of hydroxyl radical scavengers, pHs 7-9, and temperatures below 30 degrees C are optimum conditions for nitroaromatic removal. Due to the importance of hydroxyl radical reactions, removal rates in natural water are much lower than those observed in laboratory ultrapure water. Rate constants of the direct reaction between ozone and nitroaromatic hydrocarbons at 20 degrees C have been found to be lower than 6 M-1 s(-1). More than 99% of nitroaromatic removal is due to hydroxyl radical oxidation. Single ozonation of nitroaromatics can then be classified as a real advanced oxidation technology. Nitrophenols, compounds very reactive toward ozone and hydroxyl radicals, and 2,6-dinitrobenzaldehyde, identified in the single ozonation of nitrobenzene and 2,6-dinitrotoluene, respectively, are some of the first intermediates of single ozonation.