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Decomplexation and subsequent reductive removal of EDTA-chelated Cu-II by zero-valent iron coupled with a weak magnetic field: Performances and mechanisms

机译:零价铁结合弱磁场对EDTA螯合的Cu-II的分解和随后的还原去除:性能和机理

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摘要

The feasibility of EDTA-chelated Cu-II (Cu-II-EDTA) removal by zero-valent iron (Fe-0) in the presence of a weak magnetic field (WMF) and the involved mechanisms were systematically investigated. Fe-0 combined with WMF (Fe-0/WMF) was very effective for removing Cu-II-EDTA at pH 4.0-6.0 with the rate constants ranging from 0.1190 min(-1) to 0.0704 min(-1). Little passivation of Fe-0 was observed during Cu-II-EDTA removal by Fe-0/WMF in 8 consecutive runs when 10.0 mg L-1 Cu-II-EDTA was dosed before the initiation of each run. The evidences presented in this study verified that Cu-II-EDTA was removed by decomplexation followed by reduction/adsorption. In brief, Fe-II released from Fe-0 corrosion was rapidly oxidized by oxygen to Fe-II to chelate with EDTA and release free Cu-II, and the detached Cu-II ions were subsequently reduced/removed by Fe-0/Fe-II and co-precipitated by the generated iron (hydr)oxides. To advance the application of Fe-0/WMF technology in real practice, a magnetic propeller agitator was designed to offer WMF inside the reactor, which could greatly improve Cu-II-EDTA removal by Fe-0 and be easily amplified. (C) 2015 Elsevier B.V. All rights reserved.
机译:系统地研究了在弱磁场(WMF)存在下零价铁(Fe-0)去除EDTA螯合的Cu-II(Cu-II-EDTA)的可行性和相关机制。 Fe-0与WMF(Fe-0 / WMF)的结合在pH 4.0-6.0下对Cu-II-EDTA的去除非常有效,其速率常数范围为0.1190 min(-1)至0.0704 min(-1)。 Fe-0 / WMF去除Cu-II-EDTA的过程中,在连续运行8次时几乎未观察到Fe-0的钝化,在每次运行开始前添加10.0 mg L-1 Cu-II-EDTA。这项研究中提供的证据证实,Cu-II-EDTA是通过分解,然后还原/吸附去除的。简而言之,从Fe-0腐蚀释放的Fe-II被氧气迅速氧化为Fe-II,与EDTA螯合并释放出游离的Cu-II,随后通过Fe-0 / Fe还原/去除了分离的Cu-II离子。 -II和被生成的氧化铁共沉淀。为了在实际实践中促进Fe-0 / WMF技术的应用,设计了一种电磁螺旋桨式搅拌器,在反应堆内部提供WMF,可以大大提高Fe-0对Cu-II-EDTA的去除率,并且易于放大。 (C)2015 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2015年第30期|688-694|共7页
  • 作者单位

    Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China;

    Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China;

    Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China;

    Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cu-II-EDTA; Fe-0/WMF; Decomplexation; Reduction; Magnetic propeller agitator;

    机译:Cu-II-EDTA;Fe-0 / WMF;解络;还原;电磁螺旋桨搅拌器;
  • 入库时间 2022-08-17 13:22:27

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