PHOTOCHEMICAL TRANSFORMATION OF ENVIRONMENTALLY SIGNIFICANT POLYCHLOROARENES

对环境有意义的多氯芳烃的光化学转化

• 批准号: 5210972
• 负责人: PETER K FREEMAN
• 金额: --
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/5210972
• 关键词: biotransformation; carbopolycyclic compound; chlorobenzenes; dioxins; environmental toxicology; halogenation; oxidation reduction reaction; particle beam; phenols; photochemistry; photolysis; waste disposal

This research project will build on the foundation which our present efforts provide to develop a sound understanding of the mechanistic features of the photodegradation of selected polyhaloarenes of environmental health significance. This knowledge will be of benefit in understanding how potentially harmful haloarenes are transformed or created photochemically in the environment and in the development of new methods for toxic waste disposal. Efforts will be focused on (1) the determination of the role of direct fission of singlet and triplet state species and that of excimers and exciplexes as product-determining intermediates, (2) the analysis of the mechanistic basis of the regiochemistry, the use of electron transfer reagents that absorb in the sunlight range in the photodehalogenation of haloarenes that do not absorb in the sunlight range, and (3) the phototransformations of polyhaloarenes in micellar systems with and without additional electron transfer reagents. In addition, attention will be devoted to the photochemical transformations of polyhaloarenes on nonreactive surfaces, in particular, the photochemical degradation of polychlorodibenzodioxins and polychlorodibenzofurans, the analyses of the nature of the fragmentation of radical anions through use of a trochoidal electron monochromator/MS system, and the application of the mechanistic conclusions to the design and testing of small-scale reactors for toxic waste disposal.

本研究项目将建立在我们目前的基础上 努力发展对机械论的合理理解 部分多卤代芳烃的光降解特性 环境卫生意义重大。这方面的知识将有益于 了解潜在有害的卤代芳烃如何转化或 在环境中以光化学方式创造，并在开发新的 有毒废物的处置方法。工作重点将集中在(1) 单态和三态直接裂变作用的确定 作为产物决定因素的激基体和激基复合体的种类 中间体；(2)对中间体的机理基础分析。 区域化学，使用电子转移试剂，吸收在 卤代芳烃的光脱卤化反应中的太阳光范围 在太阳光范围内吸收，以及(3) 含和不含附加电子胶束体系中的多卤代芳烃 转移试剂。此外，还将致力于 多卤代芳烃在非反应表面上的光化学转化 特别是多氯二苯并二恶英的光化学降解 和多氯二苯并呋喃的性质的分析 利用摆线电子对自由基阴离子的碎裂 单色仪/质谱仪系统及其机理的应用 对有毒物质的小型反应堆设计和试验的结论 废物处理。