Degradation of antibiotics norfloxacin by Fenton, UV and UV/H2O2
Degradation of antibiotics norfloxacin by Fenton, UV and UV/H2O2
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DOI：
10.1016/j.jenvman.2015.02.021
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发表时间：
2015-05-01
影响因子：
8.7
通讯作者：
Lange, Lisete Celina
中科院分区：
文献类型：
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作者：
de Souza Santos, Lucilaine Valeria;Meireles, Alexandre Moreira;Lange, Lisete Celina
研究了直接光解（UV）、过氧化氢光解（UV/H2O2）和Fenton氧化法对诺氟沙星的降解效果。首先，评估了抗生素诺氟沙星在直接光解中的行为，以确定该工艺是否可以作为消除水处理厂药物的相关方法。结果表明，采用直接光解法降解抗生素效果不佳，反应7 h降解率为85%，矿化率为2%；导致中间产物的形成。为优化紫外处理，采用UV/H2O2联合工艺。在pH为7的条件下，测试了几种过氧化氢浓度（0.7、1.4、2.1、2.8、3.5和4.2 mmol/L）。浓度为2.1 mmol/L，反应100 min降解率为100%。在此基础上，对相同浓度H2O2在pH为2、3、5和10时的反应速度进行了评价。在pH为2和3的条件下，反应时间最短（60 min）。采用Fenton氧化法处理，60 min内化合物的降解率为60%，矿化率为55%。研究表明，Fenton氧化法和UV/H2O2法对诺氟沙星的去除率分别达到100%和50%，矿化率分别达到55%和32%。(C) 2015 Elsevier Ltd.版权所有。
This study aimed to evaluate the degradation of the antibiotic norfloxacin, using direct photolysis (UV), photolysis with hydrogen peroxide (UV/H2O2) and Fenton's oxidation processes. Initially, it was evaluated the behavior of the antibiotic norfloxacin on direct photolysis, in order to see if the process could be a pertinent way to eliminate the drug in water treatment stations. The results showed that the use of direct photolysis was not effective in the degradation of the antibiotic, reaching a degradation rate of 85% and a mineralization rate of 2% in 7 h of reaction; leading to the formation of intermediates products. To optimize the UV treatment, it was used the combined UV/H2O2 process. Several concentrations of hydrogen peroxide (0.7, 1.4, 2.1, 2.8, 3.5 and 4.2 mmol/L) at pH 7 were tested. The concentration of 2.1 mmol/L reached a degradation rate of 100% in 100 min of reaction. Based on this result, the speed of the reaction at pH 2, 3, 5, and 10 was evaluated for that same concentration of H2O2. The shortest reaction time (60 min) was verified at pH 2 and 3. For the treatment using Fenton oxidation, a degradation rate of 60% of the compound and a mineralization rate of 55% was obtained in 60 min. The study revealed that the Fenton oxidation and UV/H2O2 can be used for norfloxacin removal, reaching respectively degradation rates of 100% and 50%, and mineralization rates of 55% and 32%. (C) 2015 Elsevier Ltd. All rights reserved.