纳米零价铁原位修复有机卤化物的影响因素

doi:10.11867/j.issn.1001-8166.2013.10.1106

土壤和地下水的有机卤化物污染日益严重, 且HOCs毒性强、难生物降解。纳米零价铁由于其独特的性质, 已成为国内外原位修复研究的热点。在NZVI降解HOCs反应机理和动力学的基础上, 综述了不同方法制备的裸露NZVI和不同修饰型NZVI 的内在性质, 以及pH、溶解氧、离子、金属、不反应的疏水性有机物和天然有机物、HOCs的浓度和组成、微生物和地下异质性等外在环境因素对NZVI原位修复的稳定性、输送性、锚定目标物能力以及反应活性等方面的影响, 并对该技术的实际应用做出了总结和展望。

关键词: 原位修复, 有机卤化物, 纳米零价铁, 影响因素

The pollution of soil and groundwater by halogenated organic compounds (HOCs) is more and more severe. HOCs are of strong toxicity and difficult to be biodegraded. Due to its unique advantages, nanoscale zerovalent iron (NZVI) has become a hot research topic in the field of insitu remediation around the world. In this paper, basic reaction theories and kinetics of HOCs degradation by NZVI are briefly summarized. The influence factors on the insitu remediation of HOCs by NZVI are comprehensively discussed. The influence factors include the intrinsic properties of NZVI due to its different preparation and modification methods, and environment factors, such as pH, dissolved oxygen, ionic species, metals, nonreactive hydrophobic and natural organic compounds, concentrations and components of HOCs, microorganisms and subsurface heterogeneity. The effects of all these factors on NZVI stability, deliverability, targeting ability, and reactivity during insitu remediation are emphasized. Finally, the practical application of this technology are summarized and prospected.

Key words: Halogenated organic compounds, Influence factors., In-situ remediation, Nanoscale zerovalent iron

中图分类号:

P951
O622.2

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摘要

Influence Factors on the In-situ Remediation of Halogenated Organic Compounds by Nanoscale Zerovalent Iron