不同环境条件下Fe^(3+)对金霉素降解机制的影响  

Effect of Fe^(3+) on the Degradation Mechanism of Chlortetracycline Under Different Environmental Conditions

作　　者：王辉[1] 姚宏[1] 田盛 马友千 于晓华[1] 

机构地区：[1]北京交通大学市政环境工程系,北京100044 [2]哈尔滨辰能工大环保科技股份有限公司,哈尔滨150078

出　　处：《北京工业大学学报》2013年第6期954-960,共7页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(51078023);北京市自然科学基金资助项目(8122033)

摘　　要：金霉素(chlortetracycline,CTC)是一种广泛应用于人类和动植物疾病防治的广谱抗生素,作为一类难降解有机物存在于水环境中.通过对Fe3+与CTC的络合反应机制以及不同条件(Fe3+与CTC的摩尔比、温度、pH)下CTC降解规律的研究,探讨了Fe3+的存在对CTC降解规律的影响.结果表明:1 molCTC分子最多络合2 molFe3+,且Fe3+与CTC的结合部位在CTC分子的A环;Fe3+的浓度会对CTC降解产生影响,当Fe3+与CTC的摩尔比为1∶1时,CTC的降解速率最大;CTC的降解速率随着温度和pH的升高而增大;投入与CTC等浓度的Fe3+时,10和20℃条件下CTC的降解速率分别提高了271%和322%(30℃时,Fe3+的效果不是很显著),pH=3、5和7时CTC的降解速率分别提高400%、141%和179%.由于Fe3+大量存在于金霉素制药废水中,通过研究不同环境条件下Fe3+对金霉素降解机制的影响规律,可为实际工程环境条件的确定及制药废水中CTC降解模型的建立提供科学依据.Abstract： Chlortetracycline is a kind of broad-spectrum antibiotics which is used for treating human diseases and animal diseases, and as a kind of persistent organic pollutants （POPs） remained in the aquatic environment. The degradation of CTC with the influence of Fe3 ＋ was discussed via complexation reaction mechanism and under different conditions （ ratio of n （ Fe3 ＋ ） to n （ CTC）, temperature and pH）. Results show that the CTC-Fe3＊ complex is likely formed with the A-ring and that a single unit of CTC can complex with a maximum of two units of Fe3＋. The degradation rates are different with different concentrations of Fe3＋. When the ratio of n（ Fe3＋ ） to n（CTC） reaches 1： 1, the degradation rate attains the maximum value. In the presence of Fe（ m ） with the same concentration to CTC ,the degradation rate of CTC is significantly enhanced 271% and 322% at 10 ℃ and 20 ℃ , respectively （however, the effect of Fe3＋ was not significant at 30 ℃ ） , and by 400% , 141% and 179% at pH 3, 5 and 7 ,respectively. Because of the abundant appearance of Fe3＋, the results can provide a scientific basis for the determination of actual engineering environment condition and the modeling of CTC＇s degradation in pharmaceutical wastewater treatment.

关 键 词：金霉素(CTC) FE3+ 降解规律 

分 类 号：X703.1[环境科学与工程—环境工程]