紫外辐射加速磺胺嘧啶生物降解的机理  

Mechanism of UV photolysis for accelerating sulfadiazine biodegradation

作　　者：侯硕豪 潘诗卉 刘辛悦 蔡泽仁 李恩杰[1] 张永明[1] 

机构地区：[1]上海师范大学生命与环境科学学院环境科学与工程系,上海200234

出　　处：《环境工程学报》2015年第11期5376-5380,共5页Chinese Journal of Environmental Engineering

基　　金：教育部博士点基金项目(20113127110002);上海市基础研究重点项目(11JC1409100);清华大学环境模拟与污染控制国家重点实验室开放基金(13K09ESPCT)

摘　　要：采用紫外光解与生物降解耦合的方法可以明显提高磺胺嘧啶(SD)的生物降解速率。经过分析,发现SD在紫外光解过程中首先生成对氨基苯磺酸(p-aminobenzenesulfonic acid,ABS)和2-氨基嘧啶(2-aminopyrimidine,2-AP),而ABS很快分解为苯胺(aniline,An)和SO2-4。其中2-AP不能加速苯胺的生物降解,反而具有一定的生物抑制。而苯胺可以提高其生物降解速率。按比例同时将2-AP和An加入到SD溶液中,其生物降解速率与紫外光解耦合生物降解时相近,是单独生物降解速率的2倍。这是因为苯胺在生物氧化过程中,可以提供足够的电子并通过共基质作用加速SD的初始单加氧反应。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 SO2-4. 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.

关 键 词：磺胺嘧啶 紫外光解 生物降解 

分 类 号：X703[环境科学与工程—环境工程]