首页> 外文会议>2011 water quality technology conference amp; exposition: An Oasis of Ideas for a Changing Environment. >Degradation Kinetics of Selected Micropollutants in Aqueous Solutions by Ozonation and UV/H_2O_2
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Degradation Kinetics of Selected Micropollutants in Aqueous Solutions by Ozonation and UV/H_2O_2

机译:臭氧和UV / H_2O_2降解水溶液中某些微量污染物的动力学

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Second-order rate constants of 22 selected micropollutants for reaction with ozone (k_(O3))rnand hydroxyl radicals (k_(OH)) were obtained during both ozonation and UV/H_2O_2 advancedrnoxidation (AOP) using batch reactors. Three different methods were used to determinernthe rate constants with ozone which ranged from 10~(-2) to 10~7 M~(-1)s~(-1). The competitionrnkinetics method was used to obtain the rate constant with OH radicals which ranged fromrn10~8 to 10~(10) M~(-1)s~(-1). The determined rate constants were compared with data from thernliterature, and good agreement was observed. In general, ozone reactions are highlyrnselective for compounds with activated aromatic rings such as phenolic, anisole, orrnaniline moieties, as shown by their very large range of k_(O3) values. The general trend ofrnozone reactivity can be explained by the compound structure and the electrophilic naturernof ozone reactions. All 22 compounds were highly reactive with OH radicals as shown byrntheir high k_(OH) values. For compounds with low reactivity towards ozone, ozonationrntreatment could be insufficient for removing them from drinking water; in these cases OHrnradical-based treatment processes such as O_3/H_2O_2 or UV/H_2O_2 are recommended.
机译:使用间歇反应器在臭氧化和UV / H_2O_2先进氧化(AOP)期间获得了22种选定的与臭氧(k_(O3))rn和羟基自由基(k_(OH))反应的微污染物的二级速率常数。用三种不同的方法确定臭氧的速率常数,范围从10〜(-2)到10〜7 M〜(-1)s〜(-1)。用竞争动力学法求出OH自由基的速率常数,范围为rn10〜8至10〜(10)M〜(-1)s〜(-1)。将确定的速率常数与来自文献的数据进行比较,并观察到良好的一致性。通常,臭氧反应对具有活化芳环的化合物(例如酚,苯甲醚,奥尼苯胺部分)具有高度选择性,如其k_(O3)值的很大范围所示。 rnozone反应性的一般趋势可以通过化合物结构和臭氧反应的亲电性质来解释。如其高k_(OH)值所示,所有22种化合物均与OH自由基高度反应。对于对臭氧的反应性低的化合物,臭氧化处理可能不足以将其从饮用水中去除。在这些情况下,建议使用基于羟基自由基的处理工艺,例如O_3 / H_2O_2或UV / H_2O_2。

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