Project 6: Use of Oxidants Produced by Nanoparticulate & Granular Zero-Valent

拟议研究的主要目标是评估使用产生的氧化剂的潜力 在颗粒和纳米颗粒零价铁（ZVI）被氧腐蚀期间， 污染的地下水和土壤。这一目标将通过研究反应机理来实现 参与氧化剂生产和污染物转化以及潜在处理的效率 在类似于处理系统中可能采用的条件下使用的方法。整体 假设，我们的目的是测试是，氧化ZVI系统提供了一个实用的，具有成本效益的手段， 在超级基金场地修复对人类健康影响最大的污染物。 我们的反应机理的调查将集中在溶液化学和表面的作用 污染物转化率的结构。为了深入了解发生在或 在零价铁表面附近，溶液相中发生的化学过程将与 使用旨在探测表面的技术进行的研究，如电位测定法、表面增强 拉曼光谱和电化学石英微天平方法。 我们的调查的潜在应用的氧化零价铁系统的污染物修复 将重点关注用于处理有机污染物的可渗透反应屏障和水渗透系统 以及用于去除砷的饮用水处理系统。这些研究将把研究扩展到 氧化剂形成机制，以解释ZVI表面上的氧化物涂层对 污染物氧化速率和污染物进出腐蚀铁表面的运输。 这项研究有可能提供创新的和具有成本效益的方法来去除污染物 从地下水和饮用水，难以或昂贵的传统方法处理。的 这些技术的发展可以减少人类对有机和无机污染物的接触 关心。

The main objective of the proposed research is to assess the potential for using oxidants produced during the corrosion of granular and nanoparticulate zero-valent iron (ZVI) by oxygen to remediate contaminated groundwater and soil. This objective will be realized by studying the reaction mechanisms involved in oxidant production and contaminant transformation and the efficiency of potential treatment methods under conditions similar to those that are likely to be employed in treatment systems. The overall hypothesis that we aim to test is that the oxidative ZVI system offers a practical, cost-effective means of remediating contaminants that have the greatest impact on human health at Superfund sites. Our investigation of the reaction mechanisms will focus on the role of solution chemistry and surface structure on the rate of contaminant transformation. To gain insight into the processes occurring on or near ZVI surfaces, chemical processes occurring in the solution phase will be measured in conjunction with studies conducted using techniques designed to probe the surface, such as potentiometry, surfaceenhanced Raman spectroscopy and electrochemical quartz microbalance methods. Our investigation of the potential applications of the oxidative ZVI system to contaminant remediation will focus on permeable reactive barriers and water infiltration systems used to treat organic contaminants and drinking water treatment systems used to remove arsenic. These studies will extend the research in oxidant formation mechanisms to account for the effect of oxide coatings on the ZVI surfaces on contaminant oxidation rates and transport of contaminants to and from the corroding iron surfaces. This research has the potential to provide innovative and cost-effective ways of removing contaminants from groundwater and drinking water that are difficult or expensive to treat by conventional methods. The development of these technologies could reduce human exposure to organic and inorganic contaminants of concern.