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2,3,7,8-四氯代二苯并二噁英光解行为的量子化学 被引量:2

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摘要 应用半经验量子化学计算方法,分析了2,3,7,8-四氯代二苯并二(口恶)英(2,3,7,8-TCDD)及其降解产物光激发后的电子跃迁类型,发现其紫外吸收图谱和阳光光谱有明显的重叠,光解是该类污染物的重要降解途径.通过计算2,3,7,8-TCDD及其光解产物光激发后化学键强度的变化和氢原子自由基反应描述符fR的数值,发现 UV-A和 UV-B辐射下反应以断裂 C-O键为主,而 UV-C辐射下脱氯产物增多;2,3,7,8-TCDD逐级光解脱氯生成三氯、二氯、一氯取代的异构体,并最终生成二苯并二(口恶)英;两个苯环上氯取代较多的一边更容易脱氯.2,3,7,8-TCDD及其脱氯产物也可以断裂C-O键,生成氯和羟基取代的二苯醚化合物,通过重排和进一步光解还可以生成氯取代联苯酚、苯酚以及多氯代二苯并呋喃.
出处 《科学通报》 EI CAS CSCD 北大核心 2002年第4期269-274,共6页 Chinese Science Bulletin
基金 本工作为国家重点基础研究专项经费(批准号:G1999045711) 国家自然科学重点基金(批准号:29837180) 霍英东教育基金会经费(批准号:71077)资助项目
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同被引文献27

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