表面活性剂协同矿物结合Fe（II）还原硝基苯类化合物的作用机制

项目名称： 表面活性剂协同矿物结合Fe（II）还原硝基苯类化合物的作用机制

项目编号： No.21477081

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 化学工业

项目作者： 李益民

作者单位： 绍兴文理学院

项目金额： 85万元

中文摘要： 地下水等厌氧环境中，表面活性剂往往与硝基苯类化合物（NACs）等疏水性有机污染物共存，并影响天然矿物结合Fe(II)对NACs的还原，从而影响其迁移转化及归趋。为此，本课题拟在初步研究工作的基础上，选择环境中常见的阴离子表面活性剂（SDBS、SDS）和非离子表面活性剂（Teween-80）及其混合物，重点研究其对磁铁矿和膨润土等典型矿物结合Fe(II)还原NACs的影响及协同机制；考察不同组成与浓度表面活性剂对矿物结合Fe(Ⅱ)还原NACs反应动力学的影响，分析反应体系中矿物吸附Fe(II)量、氧化还原电位、次生矿物结构与组成、反应组分的变化，结合原位XAFS技术考察反应过程中矿物表面Fe微观结构的变化，探明表面活性剂协同矿物结合Fe(II)还原NACs的作用机制，试图为深刻认识地下水中NACs等的迁移转化行为、发展天然矿物结合Fe(Ⅱ)原位修复有机污染水体新技术提供理论指导。

中文关键词： 有机污染物；水污染控制；原位修复

英文摘要： In the anaerobic environment like groundwater, surfactants often co-exist with hydrophobic organic components such as nitroaromatics (NACs), and influence the reduction of NACs by natural Fe(II)-bearing minerals, an finally influence the tranformation and fate of NACs. For this reason and based on our preliminary research work, in this project we will choose some common surfactants in environment, including two anionic surfactants (SDBS and SDS) and one nonionic surfactant (Teween-80) as well as their mixtures, and investigate their synergetic mechanisms and effect on the reductions of NACs by Fe(II) associated on some typical minerals, such as magnetite and bentonite. The influence of surfactants with various compositions and concentrations on the reaction kinetics of NACS with Fe(II)-bearing minerals will be studied. The changes in the reaction system such as Fe(II) amount adsorbed on the minerals, redox potential, structure and composition of secondary minerals, and reactive components will be analyzed. The micro-structure change of Fe species on mineral surface during the reaction will be tested by in-situ XAFS technique. Through these investigations, we will discover the mechanisms about the synergetic effect of surfactants on reduction of NACs by Fe(II)-bearing minerals. The results will provide theoretical guidance for understanding the tranformation of NACs in groundwater, and for developing new technologies for in-situ remediation of organic pollutants using natural Fe(II)-bearing minerals.

英文关键词： organic containments;water pollution control;in situ remediation