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.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2000年第5期572-575,共4页
Acta Chimica Sinica
关键词
苯乙酮
羟基苯乙酮
紫外光解
acetophenone, hydroxyl acetophenone, intermediates, photolysis
