摘要
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（CODCr） removal could be achieved in the UV-Fe3＋（EDTA）/H2O2 process.The treatment efficiency of amoxicillin and CODCr 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）/CODCr ratio） revealed that the UV-Fe3＋（EDTA）/H2O2 process was a promising strategy to degrade amoxicillin as the biodegradability of the effuent 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.
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（CODCr） removal could be achieved in the UV-Fe3＋（EDTA）/H2O2 process.The treatment efficiency of amoxicillin and CODCr 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）/CODCr ratio） revealed that the UV-Fe3＋（EDTA）/H2O2 process was a promising strategy to degrade amoxicillin as the biodegradability of the effuent 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.
基金
supported by the National Science Foundation of China (No. 51078128)
the Hunan Provincial Innovation Foundation for Postgraduate (No. CX2009B079)
