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首页> 外文会议>Progress in environmental science and technology >Ascorbic Acid/Fe@Fe2O3: A Highly Efficient Combined Fenton Reagent to Remove Organic Contaminants
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Ascorbic Acid/Fe@Fe2O3: A Highly Efficient Combined Fenton Reagent to Remove Organic Contaminants

机译：抗坏血酸/ Fe @ Fe2O3：一种高效的Fenton组合试剂，用于去除有机污染物

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摘要

In this study,we demonstrate that the combination of ascorbic acid and Fe@Fe2O3 core-shell nanowires (AA/Fe@Fe2O3) offers a highly efficient Fenton reagent.This combined Fenton reagent exhibited extremely high activity on the decomposition of H2O2 to produce ·OH for the degradation of various organic contaminants,including rhodamine B,methylene blue,alachlor,atrazine,siduron,lincomycin,and chloroamphenicol.The contaminant degradation constants in the AA/Fe@Fe2O3/H2O2 Fenton systems were 38-53 times those in the conventional homogeneous Fenton system (Fe(Ⅱ)/H2O2) at pH 3.8.Moreover,the ·OH generation rate constant in the AA/Fe@Fe2O3/H2O2 Fenton system was 1-3 orders of magnitudes greater than those of heterogeneous Fenton systems developed with other iron-containing materials (α-FeOOH,α-Fe2O3,FeOCl,and so on).The high activity of AA/Fe@Fe2O3 was attributed to the effective Fe(Ⅲ)/Fe(Ⅱ) cycle and the iron-ascorbate complex formation to stabilize ferrous ions with desirable and steady concentrations.During the AA/Fe@Fe2O3/H2O2 Fenton process,aseorbic acid served as a reducing and complexing reagent,enabling the reuse of Fe@Fe2O3 nanowires.We systematically investigated the alachlor and ascorbic acid degradation and found that they could be effectively degraded in the AA/Fe@Fe2O3/H2O2 system,accompanying with 100％ of dechlorination and 92％ of denitrification.Gas chromatogram-mass spectrometry was employed to identify the degradation intermediates of alachlor and ascorbic acid for us to propose their possible degradation mechanisms.This study sheds light on the importance of Fe(Ⅲ)/Fe(Ⅱ) cycle for the design of high efficient Fenton system and provides an alternative pathway for the organic contaminants removal.For instance,the combination of ascorbic acid or sodium ascorbate and Fe@Fe2O3 nanowires offers a highly efficient Fenton reagent for potential wastewater treatment in a broad working pH range of 3.8-7.0.
机译：在这项研究中，我们证明抗坏血酸和Fe @ Fe2O3核壳纳米线（AA / Fe @ Fe2O3）的组合提供了高效的Fenton试剂。这种Fenton试剂对H2O2分解产生极高的活性，产生· OH降解各种有机污染物，包括若丹明B，亚甲基蓝，甲草胺，at去津，四渡龙，林可霉素和氯霉素.AA / Fe @ Fe2O3 / H2O2 Fenton体系中的污染物降解常数是其Fenton系统的38-53倍pH值为3.8的常规均质Fenton系统（Fe（Ⅱ）/ H2O2）。此外，AA / Fe @ Fe2O3 / H2O2 Fenton系统的·OH生成速率常数比所开发的异质Fenton系统大1-3个数量级。与其他含铁材料（α-FeO​​OH，α-Fe2O3，FeOCl等）一起使用。AA/ Fe @ Fe2O3的高活性归因于有效的Fe（Ⅲ）/ Fe（Ⅱ）循环和铁形成抗坏血酸复合物，以稳定和稳定的浓度稳定亚铁离子在AA / Fe @ Fe2O3 / H2O2 Fenton过程中，抗坏血酸用作还原和络合剂，使Fe @ Fe2O3纳米线得以重复使用。我们系统地研究了甲草胺和抗坏血酸的降解，发现它们可以被有效降解。在AA / Fe @ Fe2O3 / H2O2体系中，进行100％的脱氯和92％的反硝化。气相色谱-质谱法鉴定了草胺和抗坏血酸的降解中间体，提出了它们可能的降解机理。这项研究揭示了Fe（Ⅲ）/ Fe（Ⅱ）循环对于高效Fenton系统设计的重要性，并为有机污染物的去除提供了另一种途径。例如，抗坏血酸或抗坏血酸钠与Fe @ Fe2O3纳米线提供了高效的Fenton试剂，可在3.8-7.0的广泛pH范围内处理潜在的废水。

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  • 来源
  • 会议地点 Chongqing(CN)
  • 作者

    HOU Xiaojing; HUANG Xiaopeng; AI Zhihui; ZHANG Lizhi; ZHAO Jincai;

  • 作者单位

    Key Laboratory of Pesticide Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, Central China Normal University, Wuhan 430079, P.R.China;

    Key Laboratory of Pesticide Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, Central China Normal University, Wuhan 430079, P.R.China;

    Key Laboratory of Pesticide Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, Central China Normal University, Wuhan 430079, P.R.China;

    Key Laboratory of Pesticide Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, Central China Normal University, Wuhan 430079, P.R.China;

    Key Laboratory of Pesticide Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, Central China Normal University, Wuhan 430079, P.R.China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境科学基础理论;
  • 关键词

    Fe@Fe2O3 Core-Shell Nanowires; Ascorbic Acid; Alachlor; Degradation; Fenton Reaction;

    机译：Fe @ Fe2O3核壳纳米线;抗坏血酸;甲草胺;降解; Fenton反应;

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