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Role of Zero-Valent Iron in the Degradation of Organochlorine Substances in Groundwater

机译:零价铁在降解地下水中有机氯物质中的作用

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摘要

Various organochlorine compounds such as pesticides, insecticides, plant growth regulators, fumigants, and others are used in agriculture. Because of the presence of chlorine, these compounds are dangerous pollutants, which contaminate soils and surface and ground waters. For the degradation of organochlorine pollutants, zero-valent (metallic) iron Fe°, an inexpensive reducer, is used. The activity of Fe° decreases with time; therefore, for its restoration, the surface layer of Fe(III) (hydr)oxidesis removed necessary to. For this purpose, the surface of Fe° nanoparticles is modified, and mineral activators of hydrogena-tion (e.g., Ni) are added. Under anaerobic conditions, the activity of metallic iron is reduced by Fe-reducing bacteria. The Fe° barrier work period is extended by active corrosion products, primarily green rust: Fe(II)/Fe(III) layered double hydroxides with different interlayer anions. Positive results for the degradation of organochlorine compounds have been obtained.
机译:农业中使用了各种有机氯化合物,例如农药,杀虫剂,植物生长调节剂,熏蒸剂等。由于存在氯,这些化合物是危险的污染物,会污染土壤以及地表和地下水。为了降解有机氯污染物,使用了廉价的还原剂零价铁(Fe)。 Fe°的活性随时间降低;因此,为了恢复,去除了必要的氧化三价铁(III)的表面层。为此,对Fe°纳米颗粒的表面进行了改性,并添加了氢化矿物活化剂(例如Ni)。在厌氧条件下,还原铁细菌会降低金属铁的活性。有效的腐蚀产物(主要是绿锈):Fe(II)/ Fe(III)层状双氢氧化物(具有不同的层间阴离子)延长了Fe°阻挡层的工作时间。已经获得了降解有机氯化合物的积极结果。

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