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

项目6：纳米颗粒产生的氧化剂的利用

• 批准号: 7089429
• 负责人: David L. Sedlak
• 金额: $ 18.78万
• 依托单位: UNIVERSITY OF CALIFORNIA BERKELEY
• 依托单位国家: 美国
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-04-01 至 2011-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7089429
• 关键词: arsenic; biotechnology; biotransformation; chemical reaction; corrosions; environmental toxicology; ground water; iron; nanotechnology; oxidizing agents; oxygen; potentiometry; soil; surface property

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.

拟议研究的主要目的是评估使用所产生的氧化剂的潜力 在颗粒状和纳米颗粒状零价铁 (ZVI) 被氧气腐蚀期间进行修复 污染地下水和土壤。这一目标将通过研究反应机理来实现 参与氧化剂的产生和污染物的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的方法。整体 我们旨在测试的假设是氧化 ZVI 系统提供了一种实用的、具有成本效益的方法 修复超级基金场地对人类健康影响最大的污染物。 我们对反应机制的研究将重点关注溶液化学和表面的作用 结构对污染物转化率的影响。为了深入了解发生在或 在 ZVI 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，例如电位测定法、表面增强法 拉曼光谱和电化学石英微天平方法。 我们对氧化 ZVI 系统在污染物修复中的潜在应用的研究 将重点关注用于处理有机污染物的渗透性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。这些研究将扩展研究范围 氧化剂形成机制，以解释 ZVI 表面氧化物涂层对 污染物氧化速率以及污染物进出腐蚀铁表面的传输。 这项研究有可能提供创新且经济高效的污染物去除方法 来自用传统方法难以处理或昂贵的地下水和饮用水。这 这些技术的发展可以减少人类接触有机和无机污染物的机会 值得关注。