ELECTROCATALYTIC REDUCTION OF HALOGENATED BIPHENYLS

该项目将设计出新的、高效、清洁的电催化方法。 用于销毁多氯联苯和多溴联苯等卤化污染物。 该技术将适用于我们国家的其他有毒卤代化学品 氯化二苯并二恶英和二苯并呋喃等环境。我们会 开发新型胶束和微乳液催化剂体系，适用于 最容易发现污染物的含水介质 大自然。利用可见光来提高催化效率 将探索去卤化，这一方法可能导致 有机卤化物的太阳能-电催化分解。我们将使用和 进一步发展电催化、光电催化和测温技术 确定分子动力学和热力学性质的方法 有毒的多氯联苯和多溴联苯的碳卤素裂解反应。 这项工作将提供EO值、反应中间寿命和 有毒同系物反应的动力学数据，这将产生洞察力 卤代联苯的环境和毒理相互作用，以及Be 用于将结构与有毒的、光化学的和生物的相关联 反应性。电催化脱卤化将扩展到烷基 二卤化物，如EDB，是美国东部供水的污染物。 预计这项研究将对最终的 解决环境污染的公共卫生问题 有机卤化物。它承诺将产生一些新的方法来 我们的长期目标是开发清洁的通用降解物方法 清理沉积物、土壤和工业等污染物质 体液。希望我们的基本成果将有助于研究 旨在阐明环境退化和毒性的机制 这些无处不在的持久性污染物。

This project will devise new, efficient, and clean electrocatalytic methods for destruction of halogenated pollutants such as PCB's and PBB's. Techniques will be applicable to other toxic haloromatic chemicals in our environment like chlorinated dibenzodioxins and dibenzofurans. We will develop new micelle- and microemulsion-based catalyst systems usable in water-containing media where pollutants are most likely to be found in nature. The use of visible light to enhance rates of catalytic dehalogenation will be explored, an approach which may lead to solar-electrocatalytic decomposition of organo-halides. We will use and further develop electrocatalytic, photo-electrocatalytic, and thermometric methods for establishing kinetic and thermodynamic properties of carbon-halogen cleavage reactions of toxic PCB's and PBB's. This aspect of the work will provide Eo-values, reactive-intermediate lifetimes, and kinetic data for reactions of toxic congeners, which will yield insight into environmental and toxicologic interactions of halobiphenyls, and be useful in correlating structure with toxic, photochemical, and biological reactivities. Electrocatalytic dehalogenation will be extended to alkyl dihalides such as EDB, a contaminant of water supplies in the eastern U.S. The research is expected to yield significant contributions to an eventual solution of the public health problem of pollution of the environment with organo-halide compounds. It promises to generate some new approaches to our long-term goal of developing clean general methods for degradative cleanup of contaminated materials such as sediments, soils, and industrial fluids. It is hoped that our fundamental results will aid in research aimed at elucidating mechanisms of environmental degradation and toxicity of these ubiquitous and persistent pollutants.