Kinetics of the reaction between hydrogen peroxide and aqueous iodine: Implications for technical and natural aquatic systems.
Kinetics of the reaction between hydrogen peroxide and aqueous iodine: Implications for technical and natural aquatic systems.
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DOI：
10.1016/j.watres.2020.115852
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发表时间：
2020-04
期刊：
影响因子：
12.8
通讯作者：
Jaedon Shin;Yunho Lee;U. von Gunten
中科院分区：
文献类型：
--
作者：
Jaedon Shin;Yunho Lee;U. von Gunten
含碘沃茨的氧化处理可导致形成潜在毒性的碘化消毒副产物（I-DBP）。碘离子（I-）易被氧化为HOI，与溶解性有机物（DOM）反应可产生I-DBPs。过氧化氢（H2 O2）在基于H2 O2的高级氧化工艺或基于过氧乙酸或高铁酸盐（VI）的水处理过程中通过还原HOI来最大限度地减少I-DBP的形成方面起着关键作用。为了评估这些反应的重要性，在pH 4.0-12.0的范围内测定了HOI与H2 O2反应的二级速率常数。H2 O2在接近中性pH时与HOI表现出相当大的反应性（在pH 7.1和8.0时，k（app）分别为9.8 x 103和6.3 x 104 M（-1）s（-1）。H2 O2与HOI、HO 2-与HOI、HO 2-与OI-反应的物种特异性二级速率常数被确定为k（H2O2+ HOI）= 29+/-5.2 M（-1）s（-1），k（HO2）-+（HOI）=（3.1+/-0.3）× 108M（-1）s（-1），k（HO2）-（-）=（6.4+/-1.4）× 107M（-1）s（-1）。测定了HOI与H_2O_2反应的活化能为Ea= 34 kJ·mol ~（-1）。还研究了缓冲液类型（磷酸盐、乙酸盐和硼酸盐）及其浓度的影响。磷酸盐和乙酸盐缓冲液显着增加的H2 O2-HOI反应的速率在pH 7.3和4.7，分别，而硼酸盐的效果是温和的。可以证明，通过向含HOI和苯酚的溶液中加入H2 O2，可以显著减少作为I-DBPs形成模型的苯酚形成碘苯酚。在O-3/H2 O2工艺或过氧乙酸水处理过程中，I-、O-3和过氧乙酸将被I-的催化氧化所消耗，这是由于H2 O2快速还原HOI。海洋表面的O-3沉积也可能受到H2 O2的影响，这导致I-催化消耗O-3。(C)2020年，任作家。爱思唯尔有限公司出版
Oxidative treatment of iodide-containing waters can lead to a formation of potentially toxic iodinated disinfection byproducts (I-DBPs). Iodide (I-) is easily oxidized to HOI by various oxidation processes and its reaction with dissolved organic matter (DOM) can produce I-DBPs. Hydrogen peroxide (H2O2) plays a key role in minimizing the formation of I-DBPs by reduction of HOI during H2O2-based advanced oxidation processes or water treatment based on peracetic acid or ferrate (VI). To assess the importance of these reactions, second order rate constants for the reaction of HOI with H2O2 were determined in the pH range of 4.0-12.0. H2O2 showed considerable reactivity with HOI near neutral pH (k (app)= 9.8 x 103 and 6.3 x 104 M (-1) s (-1) at pH 7.1 and 8.0, respectively). The species-specific second order rate constants for the reactions of H2O2 with HOI, HO2-with HOI, and HO2-with OI-were determined as k (H2O2+ HOI)= 29+/-5.2 M (-1) s (-1), k (HO2)-+(HOI)=(3.1+/-0.3) x 10 8 M (-1) s (-1), and k (HO2)-(-)=(6.4+/-1.4) x 10 7M (-1) s (-1), respectively. The activation energy for the reaction between HOI and H2O2 was determined to be Ea= 34 kJ mol (1). The effect of buffer types (phosphate, acetate, and borate) and their concentrations was also investigated. Phosphate and acetate buffers significantly increased the rate of the H2O2-HOI reaction at pH 7.3 and 4.7, respectively, whereas the effect of borate was moderate. It could be demonstrated, that the formation of iodophenols from phenol as a model for I-DBPs formation was significantly reduced by the addition of H2O2 to HOI-and phenol-containing solutions. During water treatment with the O-3/H2O2 process or peracetic acid in the presence of I-, O-3 and peracetic acid will be consumed by a catalytic oxidation of I-due to the fast reduction of HOI by H2O2. The O-3 deposition on the ocean surface may also be influenced by the presence of H2O2, which leads to a catalytic consumption of O-3 by I-.(C) 2020 The Authors. Published by Elsevier Ltd.