Abstract: Two common metal foams,nickel foam (NF) and copper foam (CF) were prepared as the cathodes in electro-Fenton-like system.The morphology,structure,electro-Fenton-like oxidation of p-nitrophenol (p-NP) and electrode stability were compared.Results indicated that the NF and CF cathodes both had three-dimensional net structure,and there were some copper oxide particles on the CF surface.The NF and CF cathodes both could catalyze O₂ to produce H₂O₂ via two electrons reduction,and the yield of H₂O₂ were reached the maximum of 64.2mg/L and 56.5mg/L,respectively at 180min under the cathodic potential -0.9V,and the current efficiency were 14.1% and 14.3%.As pH range of application was broadened with the NF and CF cathodes in the electro-Fenton-like oxidation of p-NP,the p-NP removal efficiency were both high even if the initial pH of solution was not regulated.They were 72.9% and 80.7% at 180min under the cathodic potential -0.9V,respectively.The kinetic studies showed that the degradation of p-NP with NF and CF cathodes both followed pseudo first-order kinetics.The corresponding apparent rate constants with CF cathode were higher than that with NF cathode.The reusability of NF cathode was better than CF cathode because the removal efficiency of p-NP and the morphology of the cathode were not changed obviously after eight cycles,but a little nickel ion was found in the solution.

Key words: metal foam, electro-Fenton-like oxidation, degradation, kinetics, stability

摘要： 选用两种常见的泡沫金属材料——泡沫镍（NF）和泡沫铜（CF）作为电类Fenton氧化体系的阴极，分别从电极的形貌、结构、电类Fenton氧化降解对硝基酚（p-NP）和稳定性能等方面进行了比较分析。结果表明，NF和CF均为三维多孔网络结构，CF电极表面有少量铜氧化物颗粒沉积；NF和CF阴极均能催化O₂原位两电子还原产H₂O₂，当阴极电位为－0.9V，180min时H₂O₂的累积质量浓度达最大值，分别为64.2mg/L和56.5mg/L，电流效率分别为14.1%和14.3%；NF和CF阴极可拓宽电类Fenton氧化法的pH适用范围，在不调节电解液初始pH条件下p-NP均有较好的降解效果，当阴极电位为－0.9V，180min时p-NP去除率分别为72.9%和80.7%，反应过程均符合一级动力学模型，CF电极体系p-NP的降解速率高于其在NF电极体系中的降解速率；NF电极相对CF电极的稳定性较好，重复使用8次后，p-NP去除率和电极形貌均没有明显变化，但仍有少量的镍离子 溶出。

关键词: 泡沫金属, 电类Fenton, 降解, 动力学, 稳定性