A facile-operation tubular electro-Fenton system combined with oxygen evolution reaction for flutriafol degradation: Modeling and Parameters optimizing

An effective tubular membrane cathode coated by heterogeneous Fe2O3 nanoparticles with carbon black (CB), combined with oxygen evolution reaction (OER), was fabricated to simplify the operation of electro-Fenton system. It was demonstrated that the cathode had a favorable suitability for this system owing to the excellent performance presented on Field emission scanning electron microscopy (FE-SEM), Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and Cyclic voltammetry (CV). An optimal condition was obtained by response surface methodology (RSM) including pH of 6.7, current density of 13.0 A m(-2), membrane flux of 82.9 L m(-2) h(-1), and CB/Fe of 6.2:1. Meanwhile, we achieved an estimated degradation efficiency of flutriafol (79.6%) in optimal condition without circulation of the influent. Effects of OER on the degradation of flutriafol via Ti/RuO2 and Ti/SnO2-Sb tubular anodes were further interpreted by the gas production rate and the H-2/O-2 value. High oxygen utilization of 78.8% was acquired when Ti/RuO2 anode served as a sufficient oxygen provider. The electrocatalytic oxygen cycle, a key loop process, was firstly interpreted in this system, which achieved a great comprehensive electrocatalytic effect with the simplest operation and had a 74.5% removal of flutriafol in the verified experiment. (C) 2017 Elsevier Ltd. All rights reserved.