酰胺咪嗪光降解效能与机制及其影响因素研究  

Photodegradation Performance and Mechanisms of Carbamazepine and Its Impact Factors

作　　者：陈超[1] 赵倩[1] 封莉[1] 张立秋[1] 

机构地区：[1]北京林业大学环境科学与工程学院,北京市水体污染源控制技术重点实验室,北京100083

出　　处：《环境科学》2012年第12期4340-4345,共6页Environmental Science

基　　金：国家自然科学基金项目(51178046);中央高校基本科研基金项目(BLJC200903,YX2011-12);教育部新世纪优秀人才计划项目(NCET-08-0732)

摘　　要：以氙灯为模拟光源,研究了酰胺咪嗪(carbamazepine,CBZ)在纯水中的光降解效能与机制,并考察了硝酸根离子(NO3-)、碳酸氢根离子(HCO3-)和腐殖酸(HA)对其光降解速率的影响.结果表明,纯水中CBZ的光降解符合假一级反应动力学;在光强为1 200 mW.cm-2、CBZ初始浓度为200μg·L-1时,CBZ的光降解速率常数为0.028 7 min-1,半衰期为24.15min;纯水中CBZ的去除是以自敏化光降解反应为主,其中单线态氧(1O2)参与的自敏化光氧化反应贡献率较大,为75.3%,而羟基自由基(.OH)的贡献率较小,为5.6%;在本试验条件下,NO3-、HCO3-以及HA浓度的增加都会对CBZ的光降解过程产生抑制,其中NO3-的抑制作用最为明显,当加入的NO3-浓度为0.5 mmol·L-1时,CBZ的半衰期延长为433.22 min,约为不加NO3-时的18倍.The photodegradation performance and mechanisms of carbamazepine（CBZ） in pure water were investigated in simulated irradiation using a 300 W Xenon lamp.Batch experiments were carried out to explore the influences of nitrate（NO-3）,bicarbonateradical（HCO-3） and humic acid（HA） on CBZ＇s photodegradation.The results demonstrate that the photodegradation of CBZ in pure water follows a pseudo-first-order kinetics.When the irradiation intensity was 1 200 mW·cm-2 and the initial concentration of CBZ was 200 μg·L-1,the CBZ＇s photodegradation rate constant and half-life were 0.028 7 min-1 and 24.15 min,respectively.Sensitization degradation gave the priority to the photodegradation of CBZ,and the contribution of singlet oxygen（1 O2） was 75.3% which was higher than hydroxyl radical（·OH） of 5.6%.Under the conditions of this study,the increase of NO-3,HCO-3 and HA concentration inhibited CBZ＇s photodegradation.Among of which,the inhibition effect of NO-3 on CBZ＇s photodegradation was the most significant.When the concentration of NO-3was up to 0.5 mmol·L-1,the half-life of CBZ was prolonged to 433.22 min,which was 18 times as that in pure water without NO-3.

关 键 词：酰胺咪嗪 光降解 硝酸根离子 碳酸氢根离子 腐殖酸 

分 类 号：X131.2[环境科学与工程—环境科学]