Abstract
Recently,a novel 2-electron oxygen reduction reaction(ORR)based electro-oxidation(EO)system was developed,which utilizes a H2O2 generation cathode instead of H2 evolution cathode.A Ti-based Ni-Sb co-doped SnO2(Ti/NATO)anode was selected for efficient degradation of refractory organics and O3 production.The synergistic reaction of O3/H2O2 further accelerated the generation of hydroxyl radicals(·OH)in the ORR-EO system.However,the catalytic activity and long-term effectiveness of the Ti/NATO anode limited the large-scale application of the ORR-EO process.In this study,a blue TiO2 nanotube array(blue-TiO2-NTA)inter-layer was introduced into the fabrication process between the Ti substrate and NATO catalyst layer.Compared to the Ti/NATO anode,the Ti/blue-TiO2-NTA/NATO anode achieved higher efficiency of organic removal and O3 generation.Additionally,the accelerated lifetime of the Ti/blue-TiO2-NTA/NATO anode was increased by 7 times compared to the Ti/NATO anode.When combined with CNTs-C/PTFE air cathode in ORR-EO system,all anodic oxidation and O3/H2O2 processes achieved higher·OH production.Over 92％of TOC in leachate bio-effluent was effectively eliminated with a relatively low energy cost of 45 kWh/t.
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