Mn/炭黑-泡沫镍电极电化学降解诺氟沙星

Electrochemical treatment of norfloxacin withMn/carbon black-nickel foam electrodes

电化学法降解水中有机污染物具有低碳、高效等特点。本文采用共沉淀法制备Mn/炭黑-泡沫镍电极,通过场发射扫描电镜(FESEM)、X射线光电子能谱(XPS)对电极进行了表征,考察了外加电压、极板间距、电解质浓度和诺氟沙星初始浓度对其降解效果的影响。结果表明,Mn/炭黑-泡沫镍电极可促进·OH的产生,强化电芬顿效果。钛钌-Mn/炭黑-泡沫镍电极在外加电压6 V,极板间距15 mm,电解质浓度20 mmol/L,诺氟沙星初始浓度10 mg/L条件下,诺氟沙星去除率可达83.9%,TOC去除率69.2%,能耗为9.6 kW·h/m^(3)。对比钛钌-泡沫镍电极,在相同条件下,Mn/炭黑-泡沫镍电极的诺氟沙星去除率提高了15.8%,能耗降低了0.6 kW·h/m^(3),并且电流效率提高,反应速率明显加快,表明该电极对抗生素类污染物降解具有较好的催化作用。

Electrochemical degradation is a promising method for removing organic pollutants from water due to its low carbon footprint and high efficiency.In this study,we prepared Mn/carbon black-nickel foam electrodes using a co-precipitation method and characterized them using FESEM and X-ray photoelectron spectroscopy.We investigated the effects of applied voltage,plate spacing,electrolyte concentration,and initial norfloxacin concentration on the degradation of organic pollutants.The results indicated that Mn/carbon black-nickel foam electrodes exhibited excellent performance in promoting the generation of hydroxyl radicals(·OH)and enhancing the electro-Fenton effect.At optimal conditions,including an applied voltage of 6 V,plate spacing of 15 mm,electrolyte concentration of 20 mmol/L,and initial norfloxacin concentration of 10 mg/L,the norfloxacin removal percentage reached 83.9%.Additionally,the total organic carbon(TOC)removal percentage was 69.2%,and the energy consumption was 9.6 kW·h/m^(3).Furthermore,when compared to titanium ruthenium-nickel foam electrodes under the same conditions,the Mn/carbon black-nickel foam electrode exhibited a 15.8%increase in norfloxacin removal rate,a reduction of 0.6 kW·h/m^(3) in energy consumption,improved current efficiency,and significantly accelerated reaction rates.Overall,this study demonstrates the excellent catalytic effect of the Mn/carbon black-nickel foam electrode on the degradation of antibiotic pollutants.