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首页> 外文期刊>Environmental Science & Technology >Selective Nitrate Reduction to Dinitrogen by Electrocatalysis on Nanoscale Iron Encapsulated in Mesoporous Carbon
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Selective Nitrate Reduction to Dinitrogen by Electrocatalysis on Nanoscale Iron Encapsulated in Mesoporous Carbon

机译：介孔碳包裹的纳米铁电催化选择性还原硝酸盐成氮

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src="http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-1/acs.est.7b04775/20171226/images/medium/es-2017-04775h_0006.gif">Excessive nutrients (N and P) are among the most concerned pollutants in surface and ground waters. Herein, we report nanoscale zero-valent iron supported on ordered mesoporous carbon (nZVI@OMC) for electrocatalytic reduction of nitrate (NO3–) to nitrogen gas (N2). This material has a maximum removal capacity of 315 mg N/g Fe and nitrogen selectivity up to 74%. The Fe–C nanocomposite is prepared via a postsynthetic modification including carbon surface oxidation, in-situammonia prehydrolysis of iron precursor and hydrogen reduction. The synthesized materials have large surface areas (660–830 m2/g) and small iron nanoparticles (3–9 nm) uniformly dispersed in the carbon mesochannels. The iron loading can be adjusted in the range of 0–45%. Results demonstrate that the reaction reactivity of electrocatalysis can be fine-tuned by manipulating iron nanoparticle size, degree of crystallization, as well as porous structure. Meanwhile, the small, uniform, and stable iron nanoparticle promotes fast hydrogen generation for rapid cleavage of the N–O bond. Furthermore, this material can maintain its high performance over repetitive experimental cycles. Results suggest a new approach for fast and eco-friendly nitrate reduction and a novel nZVI application.
机译：src =“ http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-1/acs.est.7b04775/20171226/images/medium /es-2017-04775h_0006.gif“>营养物质（氮和磷）过多是地表水和地下水中最令人关注的污染物之一。本文中，我们报道了有序介孔碳（nZVI @ OMC）上负载的纳米级零价铁，用于将硝酸盐（NO 3 – ）电催化还原为氮气（N 2 ）。该材料的最大去除量为315 mg N / g Fe，氮的选择性高达74％。 Fe-C纳米复合材料是通过后合成修饰制备的，包括碳表面氧化，铁前体的原位氨预水解和氢还原。合成的材料具有大的表面积（660–830 m 2 / g）和小的铁纳米颗粒（3–9 nm）均匀分散在碳介孔中。铁负载可以在0–45％的范围内调节。结果表明，可以通过控制铁纳米颗粒的大小，结晶度以及多孔结构来微调电催化的反应活性。同时，小的，均匀且稳定的铁纳米颗粒促进了氢的快速生成，从而使N-O键迅速断裂。此外，这种材料可以在重复的实验周期中保持其高性能。结果提出了一种快速，环保的硝酸盐还原新方法以及一种新型的nZVI应用。

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  • 来源
    《Environmental Science & Technology》 |2018年第1期|230-236|共7页
  • 作者

    Wei Teng; Nan Bai; Yang Liu; Yupu Liu; Jianwei Fan; Wei-xian Zhang;

  • 作者单位

    State Key Laboratory for Pollution Control, School of Environmental Science and Engineering, Tongji University, Shanghai, China 200092;

    State Key Laboratory for Pollution Control, School of Environmental Science and Engineering, Tongji University, Shanghai, China 200092;

    Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, and Advanced Materials Laboratory, Fudan University, Shanghai, China 200433;

    Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, and Advanced Materials Laboratory, Fudan University, Shanghai, China 200433;

    State Key Laboratory for Pollution Control, School of Environmental Science and Engineering, Tongji University, Shanghai, China 200092;

    State Key Laboratory for Pollution Control, School of Environmental Science and Engineering, Tongji University, Shanghai, China 200092;

  • 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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