Mechanistic investigation into sunlight-facilitated photodegradation of pyrene in seawater with oil dispersants.

摘要: This study investigated the effects of 3 model oil dispersants (Corexit EC9500A, Corexit EC9527A and SPC 1000) on photodegradation pyrene under simulated sunlight. Both enhanced pyrene, while SPC1000 slightly inhibited reaction. Span 80 Tween 85 were key ingredients causing effects, though underlying mechanisms differed. enriches in upper layer water column, whereas induces a photosensitization process. Two reactive oxygen species, 1O2 O2-, found responsible for photodegradation, presence EC9500A suppressed pathway. In terms products, generation polyaromatic intermediates, i.e., phenaleno[1,9-cd][1,2]dioxine, 1-hydroxypyrene, 1,8-pyrenequinone, but did not alter classical The more prone to photochemical decomposition, with multiple by-products detected. information aids our understanding weathering compositions.