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首页> 外文期刊>Environmental research >Catalytic reduction of 4-nitrophenol by green silver nanocomposites assembled using microbial extracellular polymer substances
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Catalytic reduction of 4-nitrophenol by green silver nanocomposites assembled using microbial extracellular polymer substances

机译：使用微生物细胞外聚合物物质组装的绿色银纳米复合材料催化还原4-硝基苯酚

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摘要

Silver (Ag) nanocomposites were prepared via a facile and eco-friendly route using microbial extracellular polymer substances (EPSs) as green substrates for the catalytic reduction of 4-nitrophenol. Batch adsorption experiments demonstrated the binding of microbial EPSs to silver ions (Ag~+), which was promoted by UV light, as was evident in the kinetics and thermodynamics analyses. The assembly mechanism of Ag nanocomposites prepared using microbial EPSs in the presence of UV light was investigated using the spectral analysis. The results showed that Ag~+ was reduced and transformed into Ag~0 by the hemiacetal groups in the microbial EPSs, and that UV light accelerated the nucleation and growth of Ag~0 to form Ag nanoparticles (diameter about 12 nm), followed by loading on the surface of microbial EPSs. Catalytic reduction of 4-nitrophenol over Ag nanocomposites was almost completed within 60 s without stirring, and the kinetic rate constant (k) was 49.9 × 10~(-3) s~(-1). The recyclability test showed that Ag nanocomposites stably maintained the efficiency of catalytic reduction through five repeated reaction cycles. This work proved that Ag nanocomposites assembled using microbial EPSs have great catalytic activity in the reduction of 4-nitrophenol, providing the green and efficient catalyst for the reduction of organic pollutants in the environment.
机译：通过使用微生物细胞外聚合物物质（EPS）作为绿色基材的催化还原4-硝基苯酚，通过容易和环保途径制备银（Ag）纳米复合材料。批量吸附实验证明了微生物EPS与银离子（Ag〜+）的结合，其被UV光促进，如动力学和热力学分析中所示。使用光谱分析研究了在UV光存在下使用微生物EPS制备的AG纳米复合材料的组装机理。结果表明，通过微生物EPS中的半缩醛基团将Ag〜+降低并转化为Ag〜0，并且UV光加速了Ag〜0的成核和生长，形成Ag纳米颗粒（直径约12nm），然后进行在微生物EPS的表面上装载。 Ag纳米复合材料上的4-硝基苯酚的催化还原在60s内几乎完成而不搅拌，并且动力速率常数（k）为49.9×10〜（-3）S〜（-1）。可再循环性试验表明，Ag纳米复合材料通过五次重复的反应循环稳定地保持催化还原的效率。这项工作证明，使用微生物EPS组装的AG纳米复合材料具有很大的催化活性，减少4-硝基苯酚，提供了用于减少环境中有机污染物的绿色和有效催化剂。

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  • 来源
    《Environmental research》 |2021年第2期|111006.1-111006.10|共10页
  • 作者

    Shanshan Pi; Fang Ma; Di Cui; Liang Feng; Lu Zhou; Ang Li;

  • 作者单位

    State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin 150090 PR China;

    State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin 150090 PR China;

    Pharmaceutical Engineering Technology Research Center Harbin University of Commerce Harbin 150076 PR China;

    State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin 150090 PR China;

    State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin 150090 PR China;

    State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin 150090 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nano-silver; Microbial EPS; Hemiacetal groups; UV illumination; Catalyst; 4-NP;

    机译：纳米银;微生物eps;半缩醛群体;紫外线照明;催化剂;4-NP.;

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