...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemosphere >Humic acid aggregation in zero-valent iron systems and its effects on trichloroethylene removal
【24h】

Humic acid aggregation in zero-valent iron systems and its effects on trichloroethylene removal

机译：零价铁系统中的腐殖酸聚集及其对三氯乙烯去除的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The influence of natural organic matter on contaminant removal by Fe~0 systems has been of increasing concern. Recent studies have shown that, in addition to direct sorption on the Fe~0 surfaces, humic acid complexation with dissolved iron released from corrosion results in the formation of colloids and aggregates in solution that may affect contaminant removal. High-pressure size-exclusion chromatographic analyses revealed increasing molecular weights of dissolved humic acids with reaction time. Humic acid aggregation occurred across a wide range of molecular weight fractions. Fourier transform infrared spec-troscopic analysis of humic acid aggregates suggested the presence of inner-sphere complexation involving different oxygen-containing functional groups; hydrophobic interactions also probably contributed to aggregation as the humic acid of more aromatic and hydrophobic character was aggregated at a faster rate. Because of multiple underlying processes, a variety of cross-correlated physicochemical properties of humic acids contributed to their aggregation. The presence of humic acid aggregates provided an additional hydrophobic domain for partitioning that enhanced trichloroethylene removal, although steric blocking of the Fe~° surfaces may inhibit its reduction to some extent. Comparable effects were demonstrated for various types of humic acids.
机译：天然有机物对Fe〜0系统去除污染物的影响日益引起人们的关注。最近的研究表明，除了直接吸附在Fe〜0表面上之外，腐殖酸与腐蚀释放出的溶解铁络合还会导致溶液中胶体和聚集体的形成，这可能会影响污染物的去除。高压排阻色谱分析表明，溶解的腐殖酸的分子量随反应时间的增加而增加。腐殖酸聚集发生在很宽的分子量范围内。腐殖酸聚集体的傅里叶变换红外光谱分析表明，存在涉及不同含氧官能团的内球络合。疏水相互作用也可能有助于聚集，因为具有更多芳香和疏水特性的腐殖酸以更快的速率聚集。由于存在多个潜在过程，腐殖酸的多种相互关联的物理化学性质有助于它们的聚集。腐殖酸聚集体的存在为分区提供了额外的疏水结构域，从而增强了三氯乙烯的去除，尽管Fe〜°表面的空间封闭可能会在一定程度上抑制其还原。各种类型的腐殖酸均具有可比的效果。

著录项

  • 来源
    《Chemosphere》 |2009年第10期|1338-1343|共6页
  • 作者

    Daniel C.W. Tsang; Nigel J.D. Graham; Irene M.C. LO;

  • 作者单位

    Environmental and Water Resources Engineering, Department of Civil and Environmental Engineering, Imperial College London, South Kensington. London SW7 2AZ, UK Department of Civil and Natural Resources Engineering, University of Canterbury, New Zealand;

    Environmental and Water Resources Engineering, Department of Civil and Environmental Engineering, Imperial College London, South Kensington. London SW7 2AZ, UK;

    Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    chlorinated hydrocarbons; dechlorination; humic acid; hydrophobic partitioning; permeable reactive barriers; zero-valent iron;

    机译：氯代烃;脱氯腐植酸;疏水分配渗透性反应性屏障零价铁;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号