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产生的氧化剂的潜力 在颗粒和纳米刻张的零价值铁（ZVI）的腐蚀过程中 受污染的地下水和土壤。该目标将通过研究反应机制来实现 参与氧化剂的产生和污染物转化以及潜在处理的效率 条件下的方法类似于可能在治疗系统中使用的方法。总体 我们旨在测试的假设是，氧化ZVI系统提供了一种实用，经济高效的手段 对超级基金站点对人类健康产生最大影响的污染物的修复。 我们对反应机制的研究将集中于溶液化学和表面的作用 污染物转化速率的结构。洞悉或 在ZVI表面附近，将在溶液阶段发生的化学过程与 使用设计探测表面的技术进行的研究，例如电位测量法，表面型 拉曼光谱和电化学石英微量平衡法。 我们研究氧化ZVI系统对污染物修复的潜在应用 将重点放在用于治疗有机污染物的可渗透反应性屏障和水浸润系统 以及用于去除砷的饮用水处理系统。这些研究将扩大研究 氧化剂形成机制，以说明氧化物涂层对ZVI表面的影响 污染物氧化速率和污染物向腐蚀的铁面的运输。 这项研究有可能提供创新且具有成本效益的消除污染物的方式 来自地下水和饮用水，这些水很难或昂贵。这 这些技术的开发可以减少人类对有机和无机污染物的接触 令人担忧。