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首页> 外文期刊>Environmental Science & Technology >Mechanism(s) Controlling Sorption of Neutral Organic Contaminants by Surfactant-Derived and Natural Organic Matter
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Mechanism(s) Controlling Sorption of Neutral Organic Contaminants by Surfactant-Derived and Natural Organic Matter

机译:表面活性剂和天然有机物对中性有机污染物的吸附作用机理

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摘要

Layer silicate clays modified with catibnic surfactants (organoclays) such as hexadecyltrimethylammonium (HDTMA) are effective sorbents for neutral organic contaminants (NOCs) and may be useful for in-situ and ex-situ remediation of contaminated soils and waters. In this study, the sorptive characteristics of organoclays were compared in terms of magnitude and mechanism to those of natural soil organic matter. The data presented here support multiple mechanisms controlling the sorption of aqueous-phase NOCs on organoclays including solvation of the cationic ammonium centers, the alkyl chains of HDTMA, and the mineral surfaces and solute partitioning. In contrast, solute partitioning appears to be the singular mechanism for the sorption of aqueous-phase NOCs by natural soil organic matter. Organic contaminant sorption by the surfactant-derived organic matter of organoclays is substantially higher than by natural soil organic matter due to the existence of multiple sorptive mechanisms for organoclays and the greater solvency of their organic phases.
机译:用阳离子表面活性剂(有机粘土)如十六烷基三甲基铵(HDTMA)改性的层状硅酸盐粘土是中性有机污染物(NOC)的有效吸附剂,可用于就地和非原位修复受污染的土壤和水体。在这项研究中,有机粘土的吸附特性在大小和机理上与天然土壤有机质进行了比较。本文提供的数据支持控制有机粘土上水相NOC吸附的多种机制,包括阳离子铵中心的溶剂化,HDTMA的烷基链以及矿物表面和溶质的分配。相反,溶质分配似乎是天然土壤有机物吸附水相NOC的单一机制。由于存在多种对有机粘土的吸附机制,并且有机相具有更大的溶解能力,因此有机粘土的表面活性剂衍生有机物对有机污染物的吸附要比天然土壤有机物高得多。

著录项

  • 来源
    《Environmental Science & Technology》 |1996年第5期|p.1553-1557|共5页
  • 作者单位

    Department of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824;

  • 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 环境化学;
  • 关键词

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