模拟太阳光协同三维电极/电Fenton降解甲基橙

以TiO2纳米管为阳极、石墨电极为阴极、泡沫镍颗粒为粒子电极组成新型的模拟太阳光协同三维电极/电Fenton(3D/SPEF)体系降解甲基橙。研究了该体系的协同处理效果,以及该体系降解甲基橙的影响因素和反应动力学。结果表明:模拟太阳光与3D/EF体系光电催化联合处理表现出良好的协同效应,其处理能耗仅为3D/EF的9/16;协同体系降解甲基橙过程的表观反应动力学总级数为0.97;通过单因素实验确定协同体系最优反应条件为:电压为15 V、初始pH为7、甲基橙初始浓度为50 mg/L、Fe2+投加量为1 mmol/L,甲基橙的去除率达到93.77%,3D/SPEF体系在中性条件更有利于甲基橙的降解,克服了常规三维电极/电Fenton一般只能在酸性条件下进行的不足。

Degradation of methyl orange by simulated solar light combined with three-dimensional electro-Fenton system

In this work, we demonstrated the combination of novel simulated solar light with a three-dimensional electro-Fenton system (3D/SPEF) for the degradation of methyl orange (MO) with TiO2 nanotubes, graphite, and foam nickel as the anode, cathode, and particle electrodes, respectively.The reaction conditions, degradation kinetics, and synergistic effect of the systems in the treatment of MO were studied.The experimental results demonstrated that simulated solar light combined with a three-dimensional electro-Fenton system had a significant synergistic effect.The energy consumption of 3D/SPEF was only 9/16 of that of the 3D/EF system.The overall reaction order of the synergistic system was 0.97.The optimal reaction conditions determined by single factor experiments were as follows:the voltage was 20 V, initial solution pH was 7, MO concentration was 50 mg/L, and Fe2+ dosage was 1 mmol/L, giving a removal efficiency of 93.77%.The neutral solutions in the 3D/EF system were favorable for the degradation of MO, which overcomes the shortcomings of most three-dimensional electro-Fenton systems that could only achieve high efficiency under acidic conditions.