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首页> 外文会议>International symposium on halogenated persistent organic pollutants >DECHLORINATION OF HEXACHLOROBENZENE IN CONTAMINATED SOILS BY CU/FE MEDIATED BY NONIONIC SURFACTANTS
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DECHLORINATION OF HEXACHLOROBENZENE IN CONTAMINATED SOILS BY CU/FE MEDIATED BY NONIONIC SURFACTANTS

机译：非离子表面活性剂介导的CU / FE对污染土壤中的六氯苯脱氯

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摘要

Site soils contaminated with polychlorinated aromatic compounds such as polychlorinated biphenyls (PCBs) and hexachlorobenzene (HCB) has been a very serious problem. This study investigated the dechlorination of HCB in contaminated soils (50 mg/kg) by Cu/Fe mediated with nonionic surfactant of TritonX-100 (TX-100) in a slurry system. Results showed that the largest destruction rate was reached with 1 mM TX-100 in the range of 0–6 mM, although the aqueous concentration is far less than its critical micelle concentration. It was interpreted that low concentration of TX-100 facilitated HCB transport to Cu/Fe reactive sites via its adsorption on nonreactive sites, and high concentration of TX-100 covered reactive sites and facilitated HCB partition in solution regardless of its enhancement on HCB desorption from soils. About 98% HCB was destructed for 96 h treatment with 1 mM TX-100, and all HCB was transformed to pentachlorobenzene and tetrachlorobenzenes. Cu/Fe reduction could decrease the biotoxicity and increase the biodegradability of HCB contaminated soils, and could be used as an effective pretreatment unit prior to bioremediation.
机译：现场土壤被多氯联苯（PCBs）和六氯苯（HCB）等多氯芳烃污染了。本研究研究了在浆料系统中，TritonX-100（TX-100）的非离子表面活性剂介导的Cu / Fe对污染土壤（50 mg / kg）中HCB的脱氯作用。结果表明，尽管水溶液浓度远低于其临界胶束浓度，但1 mM TX-100在0–6 mM范围内可达到最大破坏率。据解释，低浓度的TX-100通过其在非反应性位点上的吸附促进了HCB运到Cu / Fe反应性位点，而高浓度的TX-100覆盖了反应性位点并促进了HCB在溶液中的分配，无论其对HCB从中解吸的增强作用如何土壤。用1 mM TX-100降解96％的HCB进行96小时处理，所有HCB均转化为五氯苯和四氯苯。减少铜/铁可降低被六氯苯污染的土壤的生物毒性并提高其生物降解性，并可在生物修复之前用作有效的预处理单元。

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  • 来源
  • 会议地点 Beijing(CN)
  • 作者

    Yuan S H; Zheng Z H; Chen J; Wang L L; Lu X H;

  • 作者单位

    Environmental Science Research Institute,Huazhong University of Science and Technology,Wuhan,430074,P. R. China;

    Environmental Science Research Institute,Huazhong University of Science and Technology,Wuhan,430074,P. R. China;

    Environmental Science Research Institute,Huazhong University of Science and Technology,Wuhan,430074,P. R. China;

    Environmental Science Research Institute,Huazhong University of Science and Technology,Wuhan,430074,P. R. China;

    Environmental Science Research Institute,Huazhong University of Science and Technology,Wuhan,430074,P. R. China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境分析化学;
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