核黄素光敏化氧化二苯并噻吩的研究

摘要

Photosensitized oxidative desulfurization of dibenzothiophene (DBT) in n-octane/water extraction system was studied with riboflavin as photosensitizer and O2 in air as oxidant. A 15 W UV lamp was used as the light source for irradiation and air was introduced by a gas pump for O2 supplying. The result showed that DBT was photooxidized successfully. The optimal reaction conditions are riboflavin concentration at 20 mg/L and the air flow at 80-100 mL/min. Under optimal conditions, the removal rario of DBT is up to 60％ after 2 h reaction. Riboflavin sensitized DBT by 1O2 mechanism, the kinetics of photosensitized oxidation of DBT is first-order reaction. Photooxidized products of DBT are DBT 5-oxide, DBT 5,5-dioxide and SO（42）- by mass spectrum.%以二苯并噻吩(DBT)的正辛烷溶液模拟柴油、水为溶剂、空气中的O<,2>为氧化剂和核黄素(RF)为光敏剂,研究了DBT在15 W紫外杀菌灯照射下的光化学氧化.结果表明,反应的最佳条件为:核黄素浓度20mg/L,空气流速80-100 mL/min.在该反应条件下反应2 h后,DBT的脱硫率为60%.核黄素是通过O<,2>历程来敏化DBT的.该条件下的脱硫反应符合一级反应的动力学特征.质谱分析DBT氧化后的产物有DBT亚砜、DBI砜和硫酸根离子.