title: A promising electrode material modified by Nb-doped TiO2nanotubes for electrochemical degradation of AR 73.
abstract: A distinctive SnO2Sb electrode with highly ordered Nb doped TiO2nanotubes sheet as a new substrate, obtained by NbTi alloy anodization, is prepared by pulse electrochemical deposition for the first time as electrocatalytic oxidation anode for wastewater treatment. The novel electrode has a larger surface area and smaller crystallite particles than conventional SnO2Sb electrodes as obtained from the analysis of scanning electron microscopy and X-ray diffraction. Compared with Ti/SnO2Sb and Ti/TiO2-NTs/SnO2Sb prepared by pulse electrochemical deposition, the electrode modified by NbTiO2-NTs has the higher oxygen evolution potential of 2.29 V (vs. Ag/AgCl), and the lower charge transfer resistance, which decreased by 65% and 79%. The service lifetime of NbTi/NbTiO2-NTs/SnO2Sb is 4.9 times longer than that of Ti/SnO2Sb and 1.9 times longer than that of Ti/TiO2-NTs/SnO2Sb. The new electrode is proved to have an excellent electrochemical oxidation and degradation ability using Acid Red 73 as a target organic pollutant. The AR 73 removal, chemical oxygen demand removal and kinetic rate constant are increased obviously due to the introduction of NbTiO2-NTs. Besides, the energy consumption reduces 37.2% and 31.4% in contrast with Ti/SnO2Sb and Ti/TiO2-NTs/SnO2Sb. Hence, the Ti/SnO2Sb modified by NbTiO2-NTs is a very promising anode material for the electrochemical treatment of dye wastewater.
authors.affiliation: School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, PR China. Electronic address: xuli620@163.com.
authors.forename: Li
authors.initials: L
authors.lastname: Xu
authors.affiliation: School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, PR China.
authors.forename: Gaorui
authors.initials: G
authors.lastname: Liang
authors.affiliation: School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, PR China.
authors.forename: Ming
authors.initials: M
authors.lastname: Yin
mesh_terms: D000965:Antimony / Q000737:chemistry; D001391:Azo Compounds / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry; D055664:Electrochemical Techniques; D004566:Electrodes; D043942:Nanotubes / Q000737:chemistry*; D009282:Naphthalenesulfonates / Q000737:chemistry; D009556:Niobium / Q000737:chemistry*; D010084:Oxidation-Reduction; D014001:Tin / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D000965:Antimony; D001391:Azo Compounds; D004396:Coloring Agents; D009282:Naphthalenesulfonates; D009556:Niobium; D014001:Tin; D014025:Titanium; D062065:Wastewater; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C408149:brilliant crocein
keywords: Anode substrate; Electro-catalytic oxidation; Nb doping; Sb doped SnO(2); Wastewater treatment