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首页> 外文期刊>Environmental Science & Technology >Effects of Aging and Oxidation of Pallatized Iron Embedded in Activated Carbon on the Dechlorination of 2-Chlorobiphenyl
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Effects of Aging and Oxidation of Pallatized Iron Embedded in Activated Carbon on the Dechlorination of 2-Chlorobiphenyl

机译：嵌入活性炭中的钯铁的时效和氧化对2-氯联苯苯基脱氯的影响

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摘要

Reactive activated carbon (RAC) impregnated with palladized iron has been developed to effectively treat polychlorinated biphenyls (PCBs) in the environment by coupling adsorption and dechlorination of PCBs. In this study, we addressed the dechlorination reactivity and capacity of RAC toward aqueous 2-chlorobiphenyl (2-CIBP), and its aging and longevity under various oxidizing environments. RAC containing 14.4% Fe and 0.68% Pd used in this study could adsorb 122.6 mg 2-CIBP/g RAC, and dechlorinate 56.5 mg 2-CIBP/g RAC which corresponds to 12% (yield) of its estimated dechlorination capacity. Due to Fe~0 oxidation to form oxide passivating layers, Fe_2O3/Fe_3O4 (oxide-water interface) and FeOOH/FeO (oxide-metal interface), RAC reactivity decreased progressively over aging under N_2 < H_2O + N_2 < H_2O + O_2 conditions. Considering nanoscale Fe/ Pd corrosion chemistry, the decline was quite slow at only 5.6%, 19.5%, and 32.5% over one year, respectively. Dissolved oxygen played a crucial role in enhancing 2-CIBP adsorption but inhibiting its dechlorination. The reactivity change could be explained with the properties of the aged RAC including surface area, Fe~0 content, and Fe species. During the aging and oxidation, the RAC showed limited dissolution of Fe and Pd. Finally, implementation issues regarding application of RAC system to contaminated sites are discussed.
机译：已经开发了用钯铁浸渍的活性炭（RAC），以通过结合PCB的吸附和脱氯来有效处理环境中的多氯联苯（PCB）。在这项研究中，我们研究了RAC对2-氯联苯水溶液（2-CIBP）的脱氯反应活性和容量，以及在各种氧化环境下的老化和寿命。这项研究中使用的含14.4％Fe和0.68％Pd的RAC可以吸附122.6 mg 2-CIBP / g RAC，对56.5 mg 2-CIBP / g RAC进行脱氯，这相当于其估计脱氯能力的12％（产率）。由于Fe〜0氧化形成氧化物钝化层，Fe_2O3 / Fe_3O4（氧化物-水界面）和FeOOH / FeO（氧化物-金属界面），RAC反应性在N_2

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  • 来源
    《Environmental Science & Technology》 |2009年第11期|4137-4142|共6页
  • 作者

    HYEOK CHOI; SOUHAIL R.AL-ABED; SHIRISH AGARWAL;

  • 作者单位

    National Risk Management Research Laboratory, U.S.Environmental Protection Agency, 26 West Martin Luther King Drive, Cincinnati, Ohio 45268;

    National Risk Management Research Laboratory, U.S.Environmental Protection Agency, 26 West Martin Luther King Drive, Cincinnati, Ohio 45268;

    Pegasus Technical Services, Inc., 46 East Hollister Street, Cincinnati, Ohio 45221;

  • 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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  • 正文语种 eng
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