水溶液中苯乙酮及其降解产物的紫外光光解  

Ultraviolet Photolysis of Acetophenone and Its Degradation Products in Aerated Aqueous Solution

作　　者：许宜铭[1] 

机构地区：[1]浙江大学化学系,杭州310027

出　　处：《化学学报》2000年第5期572-575,共4页Acta Chimica Sinica

摘　　要：在紫外光作用下,水中苯乙酮(10^(-4)mol.dm^(-3),pH=6)能发生直接光降解,生成邻羟基和间羟基苯乙酮等中间产物,并且这些产物又可进一步光解生成二羟基苯乙酮.在相同条件下,它们的相对光降解速率大小为:苯乙酮>间羟基苯乙酮>对羟基苯乙酮>邻羟基苯乙酮.Direct photolysis (λ≥200nm) of acetophenone in aerated aqueous solution (10-4mol·dm-3 ,pH = 6) gave 2 - hydroxyl and 3 - hydroxyl acetophenone as the main intermediates. The photolysis was greatly depressed when the solution was degassed using N2 during the irradiation. This suggests that the photodegradation proceeds via the attack of aromatic ring by reactive oxygen species which are formed from the reaction of dissolved oxygen with the excited organic substrate. It was also observed that the intermediates of hydroxyl acetophenone could undergo further photolysis to produce dihydroxyl acetophenone, and the first order apparent rate constant for the photo - disappearance follows the order: acetophenone > 3 - hydroxyl acetophenone > 4 - hydroxyl acetophenone > 2 - hydroxyl acetophenone.

关 键 词：苯乙酮 羟基苯乙酮 紫外光解 

分 类 号：O644[理学—物理化学]