碳纳米管负载四氧化三铁修饰泡沫镍电极电Fenton降解4-硝基酚

Electro-Fenton Degradation of 4-Nitrophenol with Fe_3O_4/CNT Modified Nickel Foam Electrode

以碳纳米管为载体合成了Fe_3O_4/CNT复合物,并用于修饰泡沫镍制备气体扩散电极,以4-硝基酚为模拟污染物,考察该电极的氧还原产H2O2性能与电Fenton降解4-硝基酚的效果,并探讨其可能的降解路径.结果表明,采用水热合成法能很好地将具有磁性的Fe_3O_4颗粒均匀地负载在CNT上,在溶液初始pH值7.0、电解质Na_2SO_4浓度0.1 mol/L、空气流量0.4 L/min和电流密度10 m A/cm^2条件下,Fe_3O_4/CNT修饰泡沫镍气体扩散电极电催化氧还原产H_2O_2的质量浓度和电流效率分别为185.4 mg/L和73.1%,4-硝基酚的去除率和氧化速率分别为95.8%和0.053 7 min^(-1),均高于未经修饰的泡沫镍电极和CNT修饰的泡沫镍气体扩散电极,且电极的稳定性能较好.

In the present study, a Fe3O4/CNT composite was synthesized by hydrothermal synthesis method with the carrier carbon nanotube, and then was used to modifiy the nickel foam to prepare the gas diffusion electrode. The oxygen reduction performance and the electro-Fenton oxidation effect were analyzed using the 4- nitrophenol as the model pollutant, and the possible reaction pathway was proposed. The results showed that the magnetic Fe3O4 particles were loaded on the CNT uniformly;The yield of H2O2 and current efficiency at 120 min were 185.4 mg/L and 73.1% , respectively under the reaction conditions of initial pH value7.0, Na2SO4 concentration 0.1 moL/L,gas flow rate 0.4 L/min and current density 10 mA/cm2 ;The 4-nitrophenol removal rate at 60 min and the apparent rate constant were 95. 8% and 0. 053 7 min-1 , respectively. And the performances of Fe304/CNT modified nickel foam electrode were all better than the unmodified nickel foam electrode and the CNT modified nickel foam electrode, and the stability of the gas diffusion electrode was good.