关键词: 泡沫金属, 电类Fenton, 降解, 动力学, 稳定性

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