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首页> 外文期刊>Environmental Science & Technology >Sulfidation of Zero-Valent Iron by Direct Reaction with Elemental Sulfur in Water: Efficiencies, Mechanism, and Dechlorination of Trichloroethylene
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Sulfidation of Zero-Valent Iron by Direct Reaction with Elemental Sulfur in Water: Efficiencies, Mechanism, and Dechlorination of Trichloroethylene

机译：用水中元素硫的直接反应直接反应硫化铁：三氯乙烯的效率，机理和脱氯

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摘要

Sulfidation can enhance both the reactivity and selectivity (i.e., electron efficiency, ε_e) of zero-valent iron (ZVI) in contaminant removal, which may make this technology cost-effective for a wider range of water treatment applications. However, current sulfidation methods involve either hazardous or unstable sulfidation agents (e.g., Na_2S, Na_2S_2O_3, and Na_2S_2O_4) or energy-intensive preparations (e.g., mechanochemical sulfidation with elemental sulfur). In this study, we demonstrate that very efficient sulfidation of microscale ZVI (mZVI) can be achieved at all S/Fe molar ratios (～100% sulfidation efficiency, ε_s) simply by direct reaction between elemental sulfur (S~0) and ZVI in an aqueous suspension at ambient temperature. In comparison, the ε_s values obtained using Na_2S, Na_2S_2O_3, or Na_2S_2O_4 as the sulfidation agents were only ～23,～75, and ～38%, respectively. The sulfidated mZVI produced using the new method reacts with trichloroethylene (TCE) with very high rates and electron efficiencies: rate constants and electron efficiencies were 800- and 79-fold higher than those of the unsulfidated mZVI. The enhanced performance of this material, together with the operational advantages of S~0 for sulfidation (including safety, stability, and cost), may make it a desirable product for full-scale engineering applications.
机译：硫化可以在污染物去除中提高零价铁（ZVI）的反应性和选择性（即电子效率，ε_E），这可能使该技术能够实现更广泛的水处理应用。然而，当前的硫化方法涉及任一危险的或不稳定的硫化剂（例如，Na_2S，Na_2S_2O_3和Na_2S_2O_4）或能源密集型制剂（例如，机械化学硫化与元素硫）。在这项研究中，我们证明微尺度ZVI（mZVI）的该非常有效的硫化可以在所有S /铁摩尔比（〜100％的硫化效率，ε_s）简单地通过（S〜0）和ZVI在元素硫之间的直接反应来实现环境温度下的含水悬浮液。相比之下，使用Na_2s，Na_2S_2O_3或Na_2S_2O_4获得的ε_S值作为硫化剂仅为〜23，〜75和〜38％。使用新方法生产的硫化型MZVI与具有非常高的速率和电子效率的三氯乙烯（TCE）反应：速率常数和电子效率比未硫化的MZVI高出800-79倍。这种材料的增强性能以及用于硫化（包括安全性，稳定性和成本）的S〜0的操作优势，可以使其成为全尺寸工程应用的理想产品。

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  • 来源
    《Environmental Science & Technology》 |2021年第1期|645-654|共10页
  • 作者

    Shichao Cai; Bo Chen; Xiaojiang Qiu; Jiamei Li; Paul G. Tratnyek; Feng He;

  • 作者单位

    College of Environment Zhejiang University of Technology Hangzhou 310014 China;

    College of Environment Zhejiang University of Technology Hangzhou 310014 China;

    College of Environment Zhejiang University of Technology Hangzhou 310014 China;

    College of Environment Zhejiang University of Technology Hangzhou 310014 China;

    OHSU-PSU School of Public Health Oregon Health & Science University Portland Oregon 97239 United States;

    College of Environment Zhejiang University of Technology Hangzhou 310014 China;

  • 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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