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首页> 外文期刊>Environmental Science & Technology >Puffed Rice Carbon with Coupled Sulfur and Metal Iron for High-Efficiency Mercury Removal in Aqueous Solution
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Puffed Rice Carbon with Coupled Sulfur and Metal Iron for High-Efficiency Mercury Removal in Aqueous Solution

机译：膨化稻米碳与硫和金属铁的结合去除水溶液中的高效汞

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摘要

Development of low-cost, high-efficiency, and environmentally benign adsorbents for mercury removal is of significant importance for environmental remediation. Herein, we report a novel porous puffed rice carbon (PRC) with co-implanted metal iron and sulfur, forming a high-quality PRC/Fe@S composite as a high-efficiency adsorbent for mercury removal from aqueous solution. The in situ-formed Fe nanoparticles in PRC are strongly coupled with sulfur via a supercritical CO_2 fluid approach and dispersed homogeneously in the cross-linked hierarchical porous architecture. The pore formation mechanism of Fe on PRC is also proposed. The optimized PRC/Fe@S composite offers superior selective affinity, high removal efficiency, and ultrahigh adsorption capacity of up to 738.0 mg g~(-1).It is demonstrated that the hierarchical porous carbon in the PRC/Fe@S composite not only acts as a framework to stabilize and disperse Fe nanoparticles but also provides abundant pores and voids for absorbing Hg(Ⅱ) from aqueous solution. More importantly, the absorbed Hg(Ⅲ) can be reduced to Hg(0) by Fe and further chemically immobilized by sulfur. The enhanced coupled effect is discussed and proposed. Therefore, an innovative adsorption mechanism of adsorption-reduction-immobilization is proposed, which offers a new prospect in developing high-efficiency carbon-based adsorbents in environmental remediation.
机译：开发低成本，高效和对环境无害的吸附剂以去除汞对环境修复具有重要意义。本文中，我们报道了一种新型的多孔膨化稻米碳（PRC），其与金属铁和硫共注入，形成了高质量的PRC / Fe @ S复合材料，作为从水溶液中去除汞的高效吸附剂。 PRC中原位形成的Fe纳米粒子通过超临界CO_2流体方法与硫牢固结合，并均匀地分散在交联的分级多孔结构中。还提出了Fe在PRC上的成孔机理。优化后的PRC / Fe @ S复合材料具有优异的选择性亲和力，较高的去除效率和高达738.0 mg g〜（-1）的超高吸附能力。它不仅起到稳定和分散铁纳米颗粒的作用，而且还提供了丰富的孔隙和空隙，可以从水溶液中吸收Hg（Ⅱ）。更重要的是，Fe可以将吸收的Hg（Ⅲ）还原为Hg（0），并通过硫进一步化学固定。讨论并提出了增强的耦合效应。因此，提出了一种新颖的吸附还原固定化吸附机理，为开发高效的碳基吸附剂进行环境修复提供了新的前景。

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  • 来源
    《Environmental Science & Technology》 |2020年第4期|2539-2547|共9页
  • 作者

    Ruyi Fang; Chengwei Lu; Yu Zhong; Zhen Xiao; Chu Liang; Hui Huang; Yongping Gan; Jun Zhang; Guoxiang Pan; Xinhui Xia; Yang Xia; Wenkui Zhang;

  • 作者单位

    College of Materials Science and Engineering Zhejiang University of Technology Hangzhou 310014 China;

    State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province School of Materials Science Engineering Zhejiang University Hangzhou 310027 China;

    College of Materials Science and Engineering China Jiliang University Hangzhou 310018 China;

    Department of Materials Chemistry Huzhou University Huzhou 313000 P. R. China;

    State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province School of Materials Science & Engineering Zhejiang University Hangzhou 310027 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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