紫外辐射加速磺胺嘧啶生物降解的机理

Sulfadiazine biodegradation rate could be obviously accelerated by using coupled UV photolysis with biodegradation. p-Aminobenzenesulfonic acid (ABS), 2-aminopyrimidine (2-AP) as main photolytic products were generated during UV photolysis, and ABS was soon transformed into Aniline (An) and SO42-. Among the products, 2-AP did not accelerate SD biodegradation as its inhibition to microorganism. But An could accelerate SD biodegradation. When both 2-AP and An were simultaneously added into SD solution in the ratio of their generation, SD biodegradation rate was similar to that under coupled photolysis with biodegradation, and the rate was as 2 times as that by biodegradation alone. The mechanism is that An released enough electrons to accelerate SD initial oxygenation reaction by means of co-substrate.