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首页> 外文期刊>Environmental Science & Technology >Overlooked Role of Peroxides as Free Radical Precursors in Advanced Oxidation Processes
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Overlooked Role of Peroxides as Free Radical Precursors in Advanced Oxidation Processes

机译：过氧化物在自由基氧化过程中作为自由基前体的作用被忽略

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摘要

Research efforts on advanced oxidation processes (AOPs) have long been focused on the fundamental chemistry of activation processes and free radical reactions. Little attention has been paid to the chemistry of the precursor oxidants. Herein, we found that the precursor oxidants could lead to quite different outcomes. A counterintuitive result was observed in the photoreduction of bromate/iodate: the combination of H2O2 and UV enhanced the reduction of bromate/iodate, whereas the addition of persulfate to the UV system led to an inhibitory effect. Thermodynamic and kinetic evidence suggests that the reduction of bromate in UV/H2O2 was attributable to the direct reaction between HOBr and H2O2. Both experimental determination and kinetic simulation demonstrate that the reaction between HOBr and H2O2 dominated over the (OH)-O-center dot-mediated reactions. These results suggest that H2O2 possesses some particular redox properties that distinguish it from other peroxides. The prototypical UV/H2O2 process is not always an AOP: it can also be an enhanced reduction process for chemicals with intermediates that are reducible by H2O2. Considering the increasing interest in persulfate-based AOPs, the results of this study identify some novel advantages of the classical H2O2-based AOPs.
机译：长期以来，有关高级氧化过程（AOP）的研究工作一直集中在活化过程和自由基反应的基本化学上。很少关注前体氧化剂的化学性质。在这里，我们发现前体氧化剂可能导致完全不同的结果。在溴酸盐/碘酸盐的光还原中观察到违反直觉的结果：H2O2和UV的组合增强了溴酸盐/碘酸盐的还原，而过硫酸盐的加入会导致抑制作用。热力学和动力学证据表明，UV / H2O2中溴酸盐的减少归因于HOBr和H2O2之间的直接反应。实验测定和动力学模拟均表明，HOBr和H2O2之间的反应比（OH）-O-中心点介导的反应更为重要。这些结果表明，H2O2具有一些特殊的氧化还原特性，可将其与其他过氧化物区分开。典型的UV / H2O2工艺并不总是AOP：对于具有可被H2O2还原的中间体的化学品，它也可以是增强的还原工艺。考虑到对基于过硫酸盐的AOP的兴趣日益增加，这项研究的结果确定了经典的基于H2O2的AOP的一些新颖优势。

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  • 来源
    《Environmental Science & Technology》 |2019年第4期|2054-2062|共9页
  • 作者

    Chen Zhihao; Li Xuchun; Zhang Shujuan; Jin Jiyuan; Song Xiaojie; Wang Xiaomeng; Tratnyek Paul G.;

  • 作者单位

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China;

    Zhejiang Gongshang Univ, Sch Environm Sci & Engn, Hangzhou 310018, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China;

    Oregon Hlth & Sci Univ, OHSU PSU Sch Publ Hlth, 3181 SW Sam Jackson Pk Rd, Portland, OR 97239 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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