泡沫镍和泡沫铜阴极电类Fenton氧化降解对硝基酚的比较

发布时间：2018-07-15 13:23

【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O_2原位两电子还原产H_2O_2,当阴极电位为-0.9V,180min时H2O_2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。
[Abstract]:Two common foamed metal materials, foamed nickel (NF) and foamed copper (CF), were used as cathode of Fenton-like oxidation system. The electrode morphology, structure, degradation of p-nitrophenol (p-NP) and stability were compared and analyzed. The results show that there are a few copper oxide particles on the surface of CF electrode. Both NF and CF cathode can catalyze O _ 2 in situ two-electron reproducing H _ 2O _ 2. The cumulative mass concentration of H _ 2O _ 2 reaches the maximum when the cathode potential is -0.9V ~ (-180) min. The current efficiency is 14.1% and 14.3mg / L, respectively, and the current efficiency of NF and CF cathodes can widen the pH range of Fenton-like oxidation process. The p-NP can be degraded better without adjusting the initial pH of electrolyte. The removal rates of p-NP were 72.9% and 80.7 when the cathode potential was -0.9 V ~ (-1) 180 min, respectively. The degradation rate of p-NP in CF electrode system was higher than that in NF electrode system, and the stability of NF electrode was better than that of CF electrode. After repeated use for 8 times, the removal rate of p-NP and the morphology of the electrode were not significantly changed, but a small amount of nickel ions were still dissolved.
【作者单位】：吉林师范大学环境科学与工程学院;大连理工大学环境学院;吉林省高校环境材料与污染控制重点实验室;
【基金】：吉林省科技厅重点科技攻关项目(20150204049SF) 吉林省教育厅“十二五”科学技术研究项目(2015225) 四平市科技发展计划(2015061) 工业生态与环境工程教育部重点实验室开放基金项目(KLIEEE-13-07)
【分类号】：O643.32;X703.1

【相似文献】