Abstract
Three-dimensional electrochemical reactor coupling electro-Fenton degradation of phenol with three kinds of bentonite-based various iron species (Fe-Bent): Fe3O4-Bent, Fe2O3-Bent and Fe0-Bent, as particle electrodes at original pH (6·24) was investigated. At the optimal reaction conditions, a maximum of 92·48% phenol removal and 67·48% chemical oxygen demand removal were achieved in the presence of Fe0-Bent. By evaluating Fe leaching behaviours from the particle electrodes during the degradation of phenol, it was found that both homogeneous and heterogeneous electro-Fenton reactions were all involved in the phenol degradation. Moreover, the evolution of ·OH was evaluated and its relationship with Fe leaching and phenol removal was also discussed. The results show that Fe0-Bent can act as the most efficient catalyst in this system at natural conditions, and the feasibility of the proposed combined system of electro-Fenton and three-dimensional electrochemical reactor in the removal of pollutant from wastewater.
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