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首页> 外文期刊>Environmental Science & Technology >The Reactivity and Reaction Pathway of Fenton Reactions Driven by Substituted 1,2-Dihydroxybenzenes
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The Reactivity and Reaction Pathway of Fenton Reactions Driven by Substituted 1,2-Dihydroxybenzenes

机译：1,2-二羟基苯驱动的芬顿反应的反应性和反应途径

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摘要

Fenton systems are interesting alternatives to advanced oxidation processes (AOPs) applied in soil or water remediation. 1,2-Dihydroxybenzenes (1,2-DHBs) are able to amplify the reactivity of Fenton systems and have been extensively studied in biological systems and for AOP applications. To develop efficient AOPs based on Fenton systems driven by 1,2-DHBs, the change in reactivity mediated by different 1,2-DHBs must be understood. For this, a systematic study of the reactivity of Fenton-like systems driven by 1,2-DHBs with different substituents at position 4 was performed. The substituent effect was analyzed using the Hammett constant (σ), which has positive values for electron-withdrawing groups (EWGs) and negative values for electron-donating groups (EDGs). The reactivity of each system was determined from the degradation of a recalcitrant azo dye and hydroxyl radical (HO-) production. The relationship between these reactivities and the ability of each 1,2-DHB to reduce Fe(lll) was determined. From these results, we propose two pathways for HO- production. The pathway for Fenton-like systems driven by 1,2-DHBs with EDGs depends only on the Fe(IH) reduction mediated by 1,2-DHB. In Fenton-like reactions driven by 1,2-DHBs with EWGs, the Fe(III) reduction is not primarily responsible for increasing the HO- production by this system in the early stages.
机译：Fenton系统是用于土壤或水修复的高级氧化过程（AOP）的有趣替代方案。 1,2-二羟基苯（1,2-DHBs）能够增强Fenton系统的反应性，并且已经在生物系统和AOP应用中进行了广泛的研究。要开发基于由1,2-DHB驱动的Fenton系统的高效AOP，必须了解由不同的1,2-DHB介导的反应性的变化。为此，系统研究了在位置4具有不同取代基的1,2-DHB驱动的Fenton样系统的反应性。使用哈米特常数（σ）分析取代基效应，该常数对吸电子基团（EWG）具有正值，而对给电子基团（EDGs）具有负值。根据顽固性偶氮染料的降解和羟基自由基（HO-）的产生来确定每个系统的反应性。确定了这些反应性与每种1,2-DHB还原Fe（III）的能力之间的关系。从这些结果，我们提出了HO生产的两种途径。由带有EDG的1,2-DHB驱动的Fenton样系统的途径仅取决于1,2-DHB介导的Fe（IH）还原。在1,2-DHBs与EWGs驱动的类Fenton反应中，Fe（III）的还原不是造成该系统在早期阶段增加HO产生的主要原因。

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  • 来源
    《Environmental Science & Technology》 |2017年第7期|3687-3693|共7页
  • 作者

    Pablo Salgado; Victoria Melin; Yasna Durán; Héctor Mansilla; David Contreras;

  • 作者单位

    Centro de Biotecnología, Universidad de Conception, Barrio Universitario s, Casilla 160-C, Conception, 4070386, Chile,Facultad de Ciencias Químicas, Universidad de Conception, Barrio Universitario s, Casilla 160-C, Conception, 4070386, Chile;

    Centro de Biotecnología, Universidad de Conception, Barrio Universitario s, Casilla 160-C, Conception, 4070386, Chile,Facultad de Ciencias Químicas, Universidad de Conception, Barrio Universitario s, Casilla 160-C, Conception, 4070386, Chile;

    Centro de Biotecnología, Universidad de Conception, Barrio Universitario s, Casilla 160-C, Conception, 4070386, Chile,Facultad de Ciencias Químicas, Universidad de Conception, Barrio Universitario s, Casilla 160-C, Conception, 4070386, Chile;

    Facultad de Ciencias Químicas, Universidad de Conception, Barrio Universitario s, Casilla 160-C, Conception, 4070386, Chile;

    Centro de Biotecnología, Universidad de Conception, Barrio Universitario s, Casilla 160-C, Conception, 4070386, Chile,Facultad de Ciencias Químicas, Universidad de Conception, Barrio Universitario s, Casilla 160-C, Conception, 4070386, Chile;

  • 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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