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沿溶氧梯度和光照梯度研究有机污染物在水体Fe(II)/有机酸/铁氧化物界面的降解规律

批准号21477032 学科分类水污染化学 ( B060103 )
项目负责人陈汝芬 负责人职称教授 依托单位河北师范大学
资助金额85.00
万元
项目类别面上项目 研究期限2015 年 01 月 01 日 至
2018 年 12 月 31 日
中文主题词铁氧化物;有机污染物;溶氧梯度;光照射梯度;降解机理
英文主题词Iron oxide;Organic pollutant;Dissolved oxygen concentration gradient;Light intensity gradient;Degradation mechanism

摘要

中文摘要 有机污染物和溶解的Fe(Ⅱ)/有机酸/铁氧化物共存于自然界水体中,Fe(Ⅱ)/ 铁氧化物耦合的系列氧化还原反应是自然环境降解有机污染物的重要途径,但在自然条件下随水深递减的溶氧梯度、光照射梯度分布上,缺乏对应的Fe(Ⅱ) /铁氧化物氧化还原偶联的有机物降解模型。本项目模拟自然水环境下溶氧和太阳光随水深的梯度分布,沿双参数梯度分布上研究有机污染物在水体Fe(II)/有机酸/铁氧化物表面的降解规律。通过控制通入O2/N2分压模拟溶氧梯度,考察不同光强下体相及表面的氧化还原反应,用光谱及表面分析技术,跟踪分析体系的成分及铁氧化物的表面变化,探讨影响铁氧化物表面活性的因素;研究铁氧化物对污染物吸附、还原及氧化降解间的关系;确立Fe(II)/有机酸/铁氧化物水体系在溶氧、光照梯度分布上对有机污染物的降解机理。该研究可为深入认识铁氧化物在自然环境中的作用提供新思路。
英文摘要 Fe(Ⅱ), iron oxides, organic acids and organic pollutants coexist in the natural environment aqueous solution, the oxidation-reduction reaction of Fe(Ⅱ)/ iron oxide interface is an important way of organic pollutant degradation in the natural environment. The dissolved oxygen concentration and the visible light intensity decrease with increasing water depth in natural condition. But, the degradation rule and quantitative analysis of organic pollutants in the interface of Fe(II)/ iron oxide aquatic system along the dissolved oxygen concentration and the visible light intensity gradient, has not been reported. In this study, we studied the degradation rule of organic pollutants in the interface of Fe(II)/ organic acid/ iron oxide aqueous solution along the dissolved oxygen concentration and the visible light intensity gradient in a simulated natural environment. We simulated the dissolved oxygen concentration by controlling O2/N2 partial pressure, and observed the oxidation-reduction reaction in aqueous solution and iron oxide surface under different visible light intensity. We analysed traceability on the system composition and the surface change of iron oxide by spectroscopy and surface analysis techniques, and studied on influencing factors of iron oxides activity, and investigated the relationship among surface activity, adsorption and degradation of organic pollutants on the iron oxide surface. The possible mechanism was suggested for degradation mechanism of organic pollutants in the interface of Fe(II)/ organic acid/ iron oxide aqueous solution along the dissolved oxygen concentration and the visible light intensity gradient. This studying will provide a new thought for the further understanding of the role of iron oxides in natural environment.
结题摘要

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