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首页> 外文期刊>Journal of Hazardous Materials >Degradation characteristics of humic acid over iron oxides/Fe~0 core-shell nanoparticles with UVA/H_2O_2
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Degradation characteristics of humic acid over iron oxides/Fe~0 core-shell nanoparticles with UVA/H_2O_2

机译：腐殖酸在UVA / H_2O_2上的氧化铁/ Fe〜0核壳纳米粒子的降解特性

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摘要

Iron oxides coated on Fe~0 core-shell nanospheres (nIOCl) were synthesized through the reduction of ferrous sulfate aqueous solution by sodium borohydride at ambient atmosphere. The catalyst was highly effective for the degradation of humic acid (HA) in the presence of H_2O_2 and UVA at neutral pH. Under deoxygenated conditions in the dark, the generation of hydroxyl radicals in aqueous nIOCl dispersion verified its galvanic cell-like performance, which enhanced the interfacial electron transfer and led to its higher reactivity. By the total organic carbon, the absorbance of UV_(254), FTIR, the molecular weight distribution and the chemical fractional character analysis, the degradation process of HA was shown to proceed by the disappearance of aromaticity, the increase of hydrophilic fraction and aromatic ring openings into CO_2 and small organic acid. The treated HA showed much lower reactivity toward chlorine and the disinfection byproduct (DBP) formation potential was also greatly reduced. Moreover, it was found that the DBP formation potential more depended on the structure of the intermediates of HA degradation than TOC removal.
机译：通过在环境气氛下用硼氢化钠还原硫酸亚铁水溶液，合成了包覆在Fe〜0核壳纳米球（nIOCl）上的氧化铁。该催化剂在中性pH下存在H_2O_2和UVA时对腐殖酸（HA）的降解非常有效。在黑暗中的脱氧条件下，水性nIOCl分散液中羟基自由基的产生证明了其类似原电池的性能，从而增强了界面电子转移并使其具有更高的反应性。通过总有机碳，UV_（254）的吸光度，FTIR，分子量分布和化学分数特征分析，表明HA的降解过程是由于芳香度的消失，亲水分数和芳香环的增加而进行的。开口进入CO_2和小的有机酸。处理过的HA对氯的反应性低得多，并且消毒副产物（DBP）的形成潜力也大大降低。而且，发现与TOC去除相比，DBP的形成潜力更多地取决于HA降解中间体的结构。

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  • 来源
    《Journal of Hazardous Materials》 |2010年第3期|474-479|共6页
  • 作者

    Yulun Nie; Chun Hu; Lei Zhou; Jiuhui Qu; Qunshan Wei; Dongsheng Wang;

  • 作者单位

    State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    humic acid; DBP; fenton; iron; electron transfer; galvanic cells;

    机译：腐植酸;DBP;芬顿铁;电子转移原电池;

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