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首页> 外文期刊>Environmental Science & Technology >Influence of Riboflavin on Nanoscale Zero-Valent Iron Reactivity during the Degradation of Carbon Tetrachloride
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Influence of Riboflavin on Nanoscale Zero-Valent Iron Reactivity during the Degradation of Carbon Tetrachloride

机译：核黄素对四氯化碳降解过程中纳米级零价铁反应性的影响

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摘要

Experiments were conducted to investigate the effect of riboflavin on the reactivity of nanoscale zerovalent iron (NZVI) during three reaction cycles of carbon tetrachloride (CT) degradation. The degradation kinetics of CT by NZVI without riboflavin (0.556 ± 0.044 h~(-1)) was 1.5 times higher than that with riboflavin (0.370 ±0.012 h~(-1)) in the first cycle. Riboflavin was rapidly reduced (65.0 ± 7.0 h~(-1)) by NZVI during CT degradation, resulting in the slow degradation kinetics of CT in the first cycle due to competition for electrons from NZVI between riboflavin and CT. These results indicate that riboflavin is not effective as an electron shuttle for reduction of CT by NZVI. On the other hand, the degradation kinetics of CT by NZVI without riboflavin decreased to 0.122 ± 0.033 h~(-1) in the third cycle, while that with riboflavin was significantly enhanced (0.663 ± 0.005 h~(-1)). The results from X-ray analyses and transmission electron microscopy suggest that the decline in reactivity of NZVI without riboflavin in the third cycle resulted from continuous Fe(0) oxidation to iron oxides on the NZVI surface. In contrast, riboflavin enhanced the reactivity of NZVI by reductive dissolution of passive iron oxides on NZVI surface by reduced riboflavin. The experimental results suggest that riboflavin can play a pivotal role in the prolongation of NZVI reactivity in long-term in situ and ex situ applications of NZVI.
机译：进行实验以研究核黄素对四氯化碳（CT）降解的三个反应周期中纳米级零价铁（NZVI）反应性的影响。在第一个循环中，不使用核黄素（0.556±0.044 h〜（-1））的NZVI对CT的降解动力学比使用核黄素的（0.370±0.012 h〜（-1））高1.5倍。核黄素在CT降解过程中被NZVI快速还原（65.0±7.0 h〜（-1）），由于核黄素和CT之间存在来自NZVI的电子竞争，导致第一周期CT的降解动力学缓慢。这些结果表明核黄素不能作为NZVI降低CT的电子穿梭剂。另一方面，没有核黄素的NZVI在第三个循环中的CT降解动力学下降至0.122±0.033h〜（-1），而具有核黄素的NZVI显着增强（0.663±0.005h〜（-1））。 X射线分析和透射电子显微镜的结果表明，在第三次循环中不带核黄素的NZVI反应性下降是由于连续的Fe（0）氧化为NZVI表面的铁氧化物。相反，核黄素通过减少核黄素而还原溶解在NZVI表面的被动氧化铁，从而增强了NZVI的反应性。实验结果表明，核黄素在NZVI的长期原位和异位应用中对NZVI反应性的延长起着关键作用。

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  • 来源
    《Environmental Science & Technology》 |2014年第4期|2368-2376|共9页
  • 作者

    Sungjun Bae; Woojin Lee;

  • 作者单位

    Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea;

    Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea;

  • 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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