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首页> 外文期刊>Environmental Science & Technology >Improving the Reactivity of Zerovalent Iron by Taking Advantage of Its Magnetic Memory: Implications for Arsenite Removal
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Improving the Reactivity of Zerovalent Iron by Taking Advantage of Its Magnetic Memory: Implications for Arsenite Removal

机译：利用其磁记忆力提高零价铁的反应性：脱砷的意义

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摘要

Premagnetization was employed to enhance the reactivity of zerovalent iron (ZVI) toward As(Ⅲ) sequestration for the first time. Compared to the pristine ZVI (Pri-ZVI), the rate of As(Ⅲ) elimination by the premagnetized ZVI (Mag-ZVI) was greater over the pH_(ini) range of 4.0-9.0 and increased progressively with increasing intensity of the magnetic field for premagnetization. Mag-ZVI could keep its reactivity for a long time and showed better performance than Pri-ZVI for As(Ⅲ) removal from synthetic groundwater in column tests. The Fe K-edge XAFS analysis for As(Ⅲ)-treated ZVI samples unraveled that premagnetization promoted the transformation of ZVI to iron (hydr) oxides and shifted the corrosion products from maghemite and magnetite to lepidocrocite, which favored the arsenic sequestration. The arsenic species analysis revealed that premagnetization facilitated the oxidation of As(Ⅲ) to As(Ⅴ). ZVI pretreated with grinding was very different from Mag-ZVI with regard to As(Ⅲ) removal, indicating that the improved reactivity of Mag-ZVI should not be associated with the physical squeezing effect of the ZVI grains during magnetization. The positive correlation between the remanence of Mag-ZVI and the rate constants of total arsenic removal indicated that the enhanced reactivity of Mag-ZVI was mainly ascribed to its magnetic memory, i.e., the remanence kept by Mag-ZVI.
机译：首次采用预磁化来提高零价铁（ZVI）对As（Ⅲ）螯合的反应性。与原始的ZVI（Pri-ZVI）相比，预磁化的ZVI（Mag-ZVI）在pH_（ini）范围为4.0-9.0时对As（Ⅲ）的去除率更高，并且随着磁场强度的增加而逐渐增加磁化场。在柱试验中，Mag-ZVI可以长时间保持其反应性，并且表现出比Pri-ZVI更好的去除合成地下水中As（Ⅲ）的性能。对经As（Ⅲ）处理的ZVI样品的Fe K-edge XAFS分析表明，预磁化促进ZVI转变为铁（水）氧化物，并将腐蚀产物从磁赤铁矿和磁铁矿转变为纤铁云母，这有利于砷的固存。砷物种分析表明，预磁化促进了As（Ⅲ）氧化为As（Ⅴ）。经过研磨预处理的ZVI在去除As（Ⅲ）方面与Mag-ZVI有很大不同，这表明Mag-ZVI的活性提高与磁化过程中ZVI晶粒的物理压缩效应无关。 Mag-ZVI的剩磁与总砷去除速率常数之间的正相关关系表明，Mag-ZVI的增强的反应性主要归因于其磁记忆，即Mag-ZVI保持的剩磁。

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  • 来源
    《Environmental Science & Technology》 |2015年第17期|10581-10588|共8页
  • 作者

    Jinxiang Li; Zhong Shi; Bin Ma; Pingping Zhang; Xiao Jiang; Zhongjin Xiao; Xiaohong Guan;

  • 作者单位

    State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China;

    Department of Physics, Tongji University, Shanghai 200092, People's Republic of China;

    Department of Optical Science and Engineering, Fudan University, Shanghai 200433, People's Republic of China;

    Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, People's Republic of China;

    State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China;

    State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China;

    State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of 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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