A facile-operation tubular electro-Fenton system combined with oxygen evolution reaction for flutriafol degradation: Modeling and Parameters optimizing. (20th August 2017) - Xu, Anlin
Graphical abstract: Highlights: A novel tubular cathode coated by carbon black and Fe2 O3 -NPs was fabricated and tested. Effective flutriafol degradation of in dual tubular EF reactor was optimized by RSM. Ti/RuO2 and Ti/SnO2 -Sb anode as oxygen provider can reach high oxygen utilization (78.8%). The best flutriafol removal (76.5%) without circulation was gained if Ti/RuO2 was selected as anode. The simplest operation by the EOC process without aeration, pH and iron adjustment was obtained in the system. Abstract: An effective tubular membrane cathode coated by heterogeneous Fe2 O3 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 H2 /O2 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.