Effects of NOM on the degradation of chloramphenicol by UV/H2O2 and the characteristics of degradation products

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 中国科学院饮用水科学与技术重点实验室

	Effects of NOM on the degradation of chloramphenicol by UV/H2O2 and the characteristics of degradation products
	Wang, Xiangke; Chen, Zhongshan; Hu, Chun; Wang, Haibo; Jin, Qingqing
刊名	SEPARATION AND PURIFICATION TECHNOLOGY
	2018-01-31
卷号	191 页码:108-115
关键词	Natural organic matter Chloramphenicol UV/H2O2 Degradation products Genotoxicity
ISSN号	1383-5866
文献子类	Article
英文摘要	Effects of natural organic matter (NOM) on the degradation of chloramphenicol (CAP) by UV/H2O2 and the characteristics of degradation products were investigated. With initial concentration of 5 mg L-1 CAP, UV and 0.5 mM H2O2 process induced the degradation rate constant increased to 3.75 x 10(-3) s(-1), which was about 1.6 times of that treated with UV alone. The excitation-emission matrix (EEM) fluorescence spectra showed that the degradation products included many humic acid-like compounds (HA). Therefore, addition of 5 mg/L HA to the solution decreased the degradation rate constant to 1.78 x 10(-3) s(-1), because they would compete for the oxidizing reaction of CAP with OH. However, the degradation rate constant and removal efficiency of CAP were influenced not only by the initial concentration of HA but also by the ratio of [HA](0)/[CAP](0). When the initial concentration of CAP decreased to 0.1 mg/L, the ratio of [HA](0)/[CAP](0) increased to 50. The degradation rate constant increased to 2.32 x 10(-3) s(-1). Moreover, the results of ultra high-performance liquid chromatography & quadrupole time-of-flight mass spectrometer (UPLC-Q-TOF-MS) suggested that the main degradation products were dichloroacetic acid (m/z 129) and aromatics 4-nitro-benzoic acid (m/z 167). These products were induced by the radical reaction during the UV/H2O2 treatment process. Meanwhile, Fourier transform infrared spectroscopy (FTIR) indicated that UV/H2O2 could destroy the aromatic ring of CAP and initiating the mineralization of CAP. TEQ(4-NQO) decreased to 0.20 mu g L-1 after the treatment with UV dose 2000 mJ cm(-2) and 0.5 mM H2O2. Therefore, the radical reaction and mineralization of CAP also decreased the genotoxicity obviously.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/41349]
专题	生态环境研究中心_中国科学院饮用水科学与技术重点实验室
推荐引用方式 GB/T 7714	Wang, Xiangke,Chen, Zhongshan,Hu, Chun,et al. Effects of NOM on the degradation of chloramphenicol by UV/H2O2 and the characteristics of degradation products[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2018,191:108-115.
APA	Wang, Xiangke,Chen, Zhongshan,Hu, Chun,Wang, Haibo,&Jin, Qingqing.(2018).Effects of NOM on the degradation of chloramphenicol by UV/H2O2 and the characteristics of degradation products.SEPARATION AND PURIFICATION TECHNOLOGY,191,108-115.
MLA	Wang, Xiangke,et al."Effects of NOM on the degradation of chloramphenicol by UV/H2O2 and the characteristics of degradation products".SEPARATION AND PURIFICATION TECHNOLOGY 191(2018):108-115.