磺胺二甲嘧啶在纯水和污水厂二级出水中的光解差异及机制
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摘要
以磺胺二甲嘧啶(SM_2)为目标污染物,研究了高压汞灯和紫外灯两种光源和初始浓度对SM_2光解的影响以及SM_2在二级出水中光解的主要影响因素,并通过自由基猝灭实验确定SM_2光解过程中的主要活性物质。结果表明:SM_2在紫外灯下的光解速率是高压汞灯的2.6倍;SM_2光解速率随其初始浓度的增加而减慢。SM_2在二级出水中的光解速率是纯水中的2.5倍,溶解性有机质(DOM)能显著促进SM_2的光解。SM_2在纯水中光解主要是激发三重态SM_2(3SM*2)参与的直接光解过程,其自敏化光解不利于SM_2的光解;含有DOM的溶液中,激发三重态DOM(3DOM*)参与的敏化光解是促进SM_2光解的主要原因。
This study compared the influence of two kinds of light including high-pressure instruments,a mercury lamp and a UV lamp,on sulfadimidine( SM_2),particularly on its initial concentration.The main factors that influenced SM_2 photolysis in the secondary effluent from the wastewater treatment plant( WTP) were also determined.The main active substance matters during the SM_2 photolysis process were determined by radical quenching experiments.Results showed that the UV lamp-induced photolysis rate of SM_2 was 2.6 times greater than the rate induced by the high-pressure mercury lamp,and that the photolysis rate was decreased as the initial concentration increased.Furthermore,the photolysis rate of SM_2 in the secondary effluent was 2.5 times greater than that in ultrapure water.The photolysis of SM_2 was promoted distinctly by dissolved organic matter( DOM).SM_2 photolysis in pure water mainly led to the formation of the triplet state of SM_2(3SM*2),which was involved in the direct photolysis process.Its self-sensitized photolysis went against the photolysis of SM_2.In a solution containing DOM,the excited triplet state dissolved organic matter(3DOM*) was stimulated to participate in the sensitive photolysis process,which was the main factor that promoted SM_2 photolysis.
This study compared the influence of two kinds of light including high-pressure instruments,a mercury lamp and a UV lamp,on sulfadimidine( SM_2),particularly on its initial concentration.The main factors that influenced SM_2 photolysis in the secondary effluent from the wastewater treatment plant( WTP) were also determined.The main active substance matters during the SM_2 photolysis process were determined by radical quenching experiments.Results showed that the UV lamp-induced photolysis rate of SM_2 was 2.6 times greater than the rate induced by the high-pressure mercury lamp,and that the photolysis rate was decreased as the initial concentration increased.Furthermore,the photolysis rate of SM_2 in the secondary effluent was 2.5 times greater than that in ultrapure water.The photolysis of SM_2 was promoted distinctly by dissolved organic matter( DOM).SM_2 photolysis in pure water mainly led to the formation of the triplet state of SM_2(3SM*2),which was involved in the direct photolysis process.Its self-sensitized photolysis went against the photolysis of SM_2.In a solution containing DOM,the excited triplet state dissolved organic matter(3DOM*) was stimulated to participate in the sensitive photolysis process,which was the main factor that promoted SM_2 photolysis.
引文
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[3]MARI J,SILVIA D,DAMIA B.Sulfonamide antibiotics in natural and treated waters:Environmental and human health risks[J].Emerging Organic Contaminants and Human Health,The Handbook of Environmental Chemistry,2012,20:71-92
[4]CHANG Hong,HU Jianying,ASAMI M,et al.Simultaneous analysis of 16 sulfonamide and trimethoprim antibiotics in environmental waters by liquid chroinatography-electrospray tandem mass spectrometry[J].Journal of Chromatography A,2008,1190:390-393
[5]MIAO Xiusheng,BISHAY F,CHEN Mei,et al.Occurrence of antimicrobials in the final effitlents of wastewater treatnlent planlts in Canada[J].Environmental Science and Technology,2004,38(13):3533-3541
[6]KARTHIKEYAN K G,MEYER M T.Occurrence of antibiotics in wastewater treatment facilities in Wisconsin,USA[J].Science of The Total Environment,2006,361:196-207
[7]徐维海,张干,邹世春,等.典型抗生素类药物在城市污水处理厂中的含量水平及其行为特征[J].环境科学,2007,28(8):1779-1783
[8]LI Bing,ZHANG Tong.Mass flows and removal of antibiotics in two municipal wastewater treatment plants[J].Chemosphere,2011,83(9):1284-1289
[9]王莹.安徽部分饮用水源及污水中9种抗生素的污染分布特征[D].合肥:安徽农业大学,2012
[10]CHALLIS J K,CARLSON J C,FRIESEN K J,et al.Aquatic photochemistry of the sulfonamide antibiotic sulfapyridine[J].Journal of Photochemistry and Photobiology A Chemistry,2013,262:14-21
[11]GE Linke,CHEN Jingwei,WEI Xiaoxuan,et al.Aquatic photochemistry of fluoroquinolone-antibiotics:Kinetics,pathways,and multivariate effects of main water constituents[J].Environment Science and Technology,2010,44(7):2400-2405
[12]PERISA M,BABIC S,SKORIC I,et al.Photodegradation of sulfonamides and their N4-acetylated metabolites in water by simulated sunlight irradiation:kinetics and identification of photoproducts[J].Environmental Science and Pollution Research,2013,20(12):8934-8946
[13]MOUAMFON N V M,LI Wenzhen,LU Shuguang,et al.Photodegradation of sulfamethoxazole applying UV-and VUV-based processes[J].Water Air and Soil Pollution,2011,218:265-274
[14]ITO M,FUKAHORI S,FUJIWARA T.Adsorptive removal and photocatalytic decomposition of sulfamethazine in secondary effluent using Ti O2-zeolite composites[J].Environment Science and Pollution Research,2014,21(2):834-842
[15]GAO Lihong,SHI Yali,LI Wenhui,et al.Occurrence of antibiotics in eight sewage treatment plants in Beijing,China[J].Chemosphere,2012,86:665-671
[16]XU Haomin,WILLIAM J C,JUNG J Y,et al.Photosensitized degradation of amoxicillin in natural organic matter isolate solutions[J].Water Research,2011,45(2):632-638
[17]陈伟,陈晓旸,于海瀛.磺胺二甲嘧啶在水溶液中的光化学降解[J].农业环境科学学报,2016,35(2):346-352
[18]彭娜,王开峰,刘国光,等.水中普萘洛尔的紫外光降解机制及其产物毒性[J].环境科学,2014,35(10):3794-3799
[19]FAN Yan,JI Yuefei,KONG Deyang,et al.Kinetic and mechanistic investigations of the degradation ofsulfamethazine in heatactivated persulfate oxidation process[J].Journal of Hazardous Materials,2015,300:39-47
[20]LI Yingjie,WEI Xiaoxuan,CHEN Jingwen,et al.Photodegradation mechanism of sulfonamides with excited triplet state dissolved organic matter:A case of sulfadiazine with 4-carboxybenzophenone as a proxy[J].Journal of Hazardous Materials,2015,290:9-15
[21]GE Linke,CHEN Jingwen,QIAO Xianliang,et al.Light-source-dependent effects of main water constituents on photodegradation of phenicol antibiotics:mechanism and kinetics[J].Environmental Science and Technology,2009,43(9):3101-3107