低电压条件下水体中诺氟沙星的去除效果及机理

Removal effect of norfloxacin from aqueous solution under the condition of low voltage and its mechanism

研究低电压条件下诺氟沙星(NOR)的电化学降解去除效果。结果表明:在1.3 V外加电压条件下,NOR具有较好的去除效果,在初始浓度c_0=0.09 mmol·L^(-1)时,反应70 h后,NOR去除率为90%以上;NOR的去除过程符合伪一级动力学模型。溶液pH值、腐殖酸浓度、水质条件等因素均影响NOR的电化学降解效果。中性及弱碱性条件有利于NOR的电化学去除,腐殖酸及天然水体中的有机物会抑制NOR的去除效果。在低电压条件下,NOR的矿化作用不明显,NOR的电化学降解过程中伴随着大量有机中间产物生成。

Removal of norfloxacin （NOR） from aqueous The results showed that the removal of NOR was efficient solution was studied electrochemically at weak voltage. at 1.3 V. A removal rate of 90% was achieved after 70 h of reaction using an initial concentration of 0.09 mmol · L^-1 The removal of NOR accords with a pseudo-first- order kinetic model, where the pH value, humic acid, and water quality were the main factors that affected the removal of NOR. A relatively higher removal rate of NOR was observed in both neutral and alkaline conditions. Humic acid and organic matters in natural water inhibited the removal efficiency of NOR. The mineralization of NOR was not obvious during the electrochemical reaction at weak voltage, which resulted in a large number of or- ganic intermediates in solution.