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Reductive dehalogenation of brominated disinfection byproducts by iron based bimetallic systems

机译：铁基双金属系统溴化消毒副产物的还原脱卤

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摘要

The reductive dehalogenation of brominated disinfection byproducts (DBPs) including bromoform and tribromoacetic acid (TBAA) by iron based bimetallic systems (Cu/Fe and Pd/Fe) was investigated. In Cu/Fe bimetallic system, only 8.1% of bromoform and 20.1% of TBAA were reduced within 20 min when the particle dosage was 5 g L-1, while 56.9% of bromoform and 62.7% of TBAA were removed in the same period when the dosage increased to 20 g L-1. A complete removal of bromoform and TBAA was achieved within 60 min of reaction in acidic conditions, while only 35.4% of bromoform and 10.8% of TBAA were removed after the whole experimental period (140 min) in alkaline conditions. Similar results were observed in a Pd/Fe bimetallic system. Bimetallic particles achieved high performance probably because galvanic cells were created between Fe (serving as an anode) and plating elements (serving as a cathode). This structure enhanced the reducibility of iron for reductive dehalogenation by facilitating iron corrosion as well as reducing the activation barrier of H-2. The Pd/Fe system showed a better performance than Cu/Fe, which was attributed to a higher potential gradient (1.4 V) as compared to Cu/Fe couples (0.8 V). Furthermore, toxic assessment indicated that the toxicity of water samples had a dramatic decline after dehalogenation by bimetallic particles.
机译：溴化消毒副产物（消毒副产物），其包括三溴甲烷和由铁基双金属系统（铜/铁和Pd / Fe）的三溴乙酸（TBAA）的还原性脱卤化进行了研究。在铜/铁的双金属系统中，只有8.1％三溴甲烷和TBAA的20.1％在20分钟内被减少当颗粒剂量为5g L-1，而三溴甲烷的56.9％和TBAA的62.7％，在同一时期时除去剂量增加至20g L-1。完全除去溴仿和TBAA的是在酸性条件下反应60分钟内达到，而只有35.4％的三溴甲烷和TBAA的10.8％是在碱性条件下在整个实验期间（140分钟）后除去。类似的结果在Pd / Fe的双金属系统中观察到。双金属颗粒实现可能是因为被铁（作为阳极）和电镀元件（用作阴极）之间形成原电池的高性能。这种结构通过促进铁腐蚀以及减少的H-2活化屏障增强铁为还原性脱卤化的还原性。相比于铜/铁夫妇（0.8V）的钯/铁系统显示出比铜/铁，这归因于高的电位梯度（1.4V）更好的性能。此外，毒性评估表明，水样的毒性具有由双金属颗粒的脱卤后急剧下降。

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  • 来源
    《RSC Advances》 |2016年第20期|共8页
  • 作者

    Zha Xiao-song; Ma Luming; Liu Yan;

  • 作者单位

    Fudan Univ Dept Environm Sci &

    Engn 220 Handan Rd Shanghai 200433 Peoples R China;

    Tongji Univ Coll Environm Sci &

    Engn 1239 Siping Rd Shanghai 200092 Peoples R China;

    Fudan Univ Dept Environm Sci &

    Engn 220 Handan Rd Shanghai 200433 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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