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首页> 外文期刊>Environmental Science & Technology >Highly Active and Stable Ni-Fe Bimetal Prepared by Ball Milling for Catalytic Hydrodechlorination of 4-Chlorophenol
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Highly Active and Stable Ni-Fe Bimetal Prepared by Ball Milling for Catalytic Hydrodechlorination of 4-Chlorophenol

机译：球磨制备4-氯苯酚催化加氢脱氯的高活性稳定镍铁双金属

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摘要

A novel Ni-Fe bimetal with high dechlorination activity for 4-chlorophenol (4-CP) was prepared by ball milling (BM) in this study. Increasing Ni content and milling time greatly enhanced the dechlorination activity, which was mainly attributed to the homogeneous distribution of Ni nanopartides (50- 100 nm) in bulk Fe visualized by scanning electron microscopy/energy dispersive X-ray spectrometry (SEM/EDS) with image mapping. In comparison with the Ni-Fe bimetal prepared by a chemical solution deposition (CSD) process, the ball milled Ni-Fe bimetal possessed high dechlorination activity and stability before being used up. Dechlorination kinetics indicated that the dechlorination rates of 4-CP increased with increasing Ni-Fe dose but decreased with increasing solution pH. Solution pH had a significant effect on the dechlorination of 4-CP and the passivation of the Ni-Fe bimetal. The enhanced pH during the dechlorination process significantly accelerated the formation of passivating film on the bimetallic surface. The Ni-Fe bimetal at the dose of 60 g/L was reused 10 times without losing dechlorination activity for 4-CP at initial pH less than 6.0, but the gradual passivation was observed at initial pH above 7.0.
机译：本研究通过球磨（BM）制得了一种新型的对4-氯苯酚（4-CP）具有高脱氯活性的Ni-Fe双金属。镍含量的增加和研磨时间的增加大大提高了脱氯活性，这主要归因于通过扫描电子显微镜/能量色散X射线光谱法（SEM / EDS）观察到的纳米Fe（50-100 nm）在整体Fe中的均匀分布。图像映射。与通过化学溶液沉积（CSD）工艺制备的Ni-Fe双金属相比，球磨Ni-Fe双金属在使用前具有较高的脱氯活性和稳定性。脱氯动力学表明4-CP的脱氯速率随Ni-Fe剂量的增加而增加，但随溶液pH的增加而降低。溶液的pH值对4-CP的脱氯和Ni-Fe双金属的钝化有显着影响。在脱氯过程中提高的pH值显着促进了双金属表面上钝化膜的形成。在初始pH值小于6.0时，将60 g / L剂量的Ni-Fe双金属重复使用10次，而不会失去4-CP的脱氯活性，但在初始pH值大于7.0时观察到逐渐钝化。

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  • 来源
    《Environmental Science & Technology》 |2012年第8期|p.4576-4582|共7页
  • 作者

    Fuyuan Xu; Shubo Deng; Jie Xu; Wang Zhang; Min Wu; Bin Wang; Jun Huang; Gang Yu;

  • 作者单位

    POPs Research Center, School of Environment, Tsinghua University, Beijing, P. R. China, 100084;

    POPs Research Center, School of Environment, Tsinghua University, Beijing, P. R. China, 100084,State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, P. R. China, 100084;

    POPs Research Center, School of Environment, Tsinghua University, Beijing, P. R. China, 100084;

    POPs Research Center, School of Environment, Tsinghua University, Beijing, P. R. China, 100084;

    POPs Research Center, School of Environment, Tsinghua University, Beijing, P. R. China, 100084;

    POPs Research Center, School of Environment, Tsinghua University, Beijing, P. R. China, 100084;

    POPs Research Center, School of Environment, Tsinghua University, Beijing, P. R. China, 100084,State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, P. R. China, 100084;

    POPs Research Center, School of Environment, Tsinghua University, Beijing, P. R. China, 100084,State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, P. R. China, 100084;

  • 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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