Removal of amoxicillin by UV and UV/Hub>2ub>Oub>2ub> processes

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• 作者：Yeon Jung Jungup>aup>up> ; up>up>chorong50@gmail.comup> ; Wan Gi Kimup>aup>up> ; up>up>darkangel0914@hanmail.netup> ; Yeojoon Yoonup>aup>up> ; up>up>yajoony@yonsei.ac.krup> ; Joon-Wun Kangup>aup>up> ; up>up>jwk@yonsei.ac.krup> ; Young Min Hongup>bup>up> ; up>up>fog2k@korea.comup> ; Hyun Wook Kimup>bup>up> ; up>up>h_kim@uos.ac.krup>
• 关键词：Amoxicillin ; UV/H2O2 ; Antibacterial activity ; Transformation products ; Hydroxyl radical
• 刊名：Science of the Total Environment
• 出版年：2012
• 期刊代码：63_00489697
• 类别：env
• 出版时间：15 March, 2012
• 卷：420
• 期：Complete
• 页码：160-167
• 文件大小：626 K

摘要

The degradation of the 尾-lactam antibiotic amoxicillin (AM) treated with direct UV-C and UV/Hub>2ub>Oub>2ub> photolytic processes was investigated in the present study. In addition, the antibacterial activity of the solution treated by UV/Hub>2ub>Oub>2ub> advanced oxidation was compared with AM solution treated with ozone. The degradation rate of amoxicillin in both processes fitted pseudo first-order kinetics, and the rates increased up to six fold with increasing Hub>2ub>Oub>2ub> addition at 10 mM Hub>2ub>Oub>2ub> compared to direct photolysis. However, low mineralization was achieved in both processes, showing a maximum of 50%TOC removal with UV/Hub>2ub>Oub>2ub> after a reaction time of 80 min (UV dose: 3.8 脳 10up>鈭?#xA0;3up> Einstein Lup>鈭?#xA0;1up>) with the addition of 10 mM Hub>2ub>Oub>2ub>. The transformation products formed during the degradation of amoxicillin in the UV and UV/Hub>2ub>Oub>2ub> processes were identified by LC-IT-TOF analysis. In addition, microbial growth inhibition bioassays were performed to determine any residual antibacterial activity from potential photoproducts remaining in the treated solutions. An increase of the antibacterial activity in the UV/Hub>2ub>Oub>2ub> treated samples was observed compared to the untreated sample in a time-based comparison. However, the UV/Hub>2ub>Oub>2ub> process effectively eliminated any antibacterial activity from AM and its intermediate photoproducts at 20 min of contact time with a 10 mM Hub>2ub>Oub>2ub> dose after the complete elimination of AM, even though the UV/Hub>2ub>Oub>2ub> advanced oxidation process led to bioactive photoproducts.