Photodegradation of amoxicillin by catalyzed Fe3+/H2O2 process.
Three oxidation processes of UV-Fe3+(EDTA)/H2O2 (UV: ultraviolet light; EDTA: ethylenediaminetetraacetic acid), UV-Fe3+/H2O2 and Fe3+/H2O2 were simultaneously investigated for the degradation of amoxicillin at pH 7.0. The results indicated that, 100% amoxicillin degradation and 81.9% chemical oxygen demand (COD(Cr)) removal could be achieved in the UV-Fe3+ (EDTA)/H2O2 process. The treatment efficiency of amoxicillin and COD(Cr) removal were found to decrease to 59.0% and 43.0% in the UV-Fe3+/H2O2 process; 39.6% and 31.3% in the Fe3+/H2O2 process. Moreover, the results of biodegradability (biological oxygen demand (BOD5)/COD(Cr) ratio) revealed that the UV-Fe3+ (EDTA)/H2O2 process was a promising strategy to degrade amoxicillin as the biodegradability of the effluent was improved to 0.45, compared with the cases of UV-Fe3+/H2O2 (0.25) and Fe3+/H2O2 (0.10) processes. Therefore, it could be deduced that EDTA and UV light performed synergetic catalytic effect on the Fe3+/H2O2 process, enhancing the treatment efficiency. The degradation mechanisms were also investigated via UV-Vis spectra, and high performance liquid chromatography-mass spectra. The degradation pathway of amoxicillin was further proposed.
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China. xmli@hnu.cn
Xiaoming
X
Li
Tingting
T
Shen
Dongbo
D
Wang
Xiu
X
Yue
Xian
X
Liu
Qi
Q
Yang
Jianbin
J
Cao
Wei
W
Zheng
Guangming
G
Zeng
D000658:Amoxicillin / Q000737:chemistry* / Q000528:radiation effects; D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000528:radiation effects; D004492:Edetic Acid / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D010782:Photolysis; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects
D000900:Anti-Bacterial Agents; C045076:Fenton's reagent; D014874:Water Pollutants, Chemical; D000658:Amoxicillin; D004492:Edetic Acid; D006861:Hydrogen Peroxide; D007501:Iron