PHOTOCHEMICAL TRANSFORMATION OF ENVIRONMENTALLY SIGNIFICANT POLYCHLOROARENES

本研究项目将建立在我们目前 努力提供了一个良好的理解机制， 选择的多卤代芳烃的光降解特征， 环境卫生意义。 这些知识将有助于 了解潜在有害的卤代芳烃是如何转化的， 光化学在环境中产生， 有毒废物处理方法。 工作重点是：（1） 单重态和三重态直接裂变作用的测定 物种和准分子和激基复合物作为产品决定 中间体，（2）分析的机理基础， 区域化学，使用电子转移试剂， 在卤代芳烃的光脱卤作用中， 在太阳光范围内吸收，和（3）的光转化 胶束体系中的多卤代芳烃 转移试剂。 此外，还将关注 多卤代芳烃在非反应性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分析， 利用余摆线电子分裂自由基阴离子 单色仪/质谱系统，以及机理的应用 小规模反应堆设计和试验的结论 废物处理。

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.