摘要
采用实验室模拟方法,研究了水中直链烷烃光敏化降解的途径.结果表明,经紫外光照射烷烃可被激发态的敏比剂抽取一个氢原子而形成烷基.在有氧条件下,它可形成烷氧自由基,进而被氧化成相应的酮.如果烷氧基中有γ-氢原子存在,它可通过类似于Norrish Ⅱ型重排反应,而生成短碳链的甲基酮、烯烃以及小分子量的乙烯、环氧乙烷、乙二醇、丙酮、甲醛等.
Photo-degradation pathway of alkanes in water under simulation environmental conditions with sensitizers was studied. The results show that initial attack by removal of hydrogen from carbon atoms within the chain is followed by reaction of the alkyl radicals generated with oxygen to produce alkoxy radicals. The alkoxy radicals can be oxydized to ketones by reaction with molecular oxygen. If y-hydrogen atoms were available , through cyclic electron rearrangements similar to a Norrish type Ⅱ photo-degradation the photo-degradation products will be 2-ketones , 1-alkenes,and small molecule-weight compounds,such as ethylene,oxirane, 1, 2-ethanediol,acetone and formaldehyde which can be easily degraded under aquatic environmental conditions.
出处
《环境化学》
CAS
CSCD
北大核心
1995年第1期14-20,共7页
Environmental Chemistry
基金
国家环保局资助项目
