Electrochemical degradation of dye on TiO2 nanotube array constructed anode

Abstract A high oxygen evolution potential (2.6V) and conductivity of Ti/TiO 2 NTs/Ta 2 O 5 -PbO 2 anode was fabricated by mixed metal oxide. A well-aligned TiO 2 nanotubes was successfully prepared by using 1-butyl-3-methylimidazolium tetrafluoroborate as the electrolyte. The surface structure s of anodes were characterized by scanning electron microscope, X-ray diffraction and energy dispersive X-ray spectroscopy. During the electrochemical degradation experiments, the effects of different anodes, current density, initial pH value and concentration were discussed. The results showed that co-doped Ta 2 O 5 coating is an effective method to improve the surface morphology and the electrochemical characterization of Ti/TiO 2 NTs/PbO 2 . At the initial pH value of 3 and current density of 12 mA cm −2 , the removal rates of Acid Orange 7 and total organic carbon with Ti/TiO 2 NTs/Ta 2 O 5 -PbO 2 anode were almost 100% and 98.3%. Comparing with Ti/PbO 2 anode at the same charge consumption (3 A h L −1 ), the instantaneous current efficiency of the Ti/TiO 2 NTs/Ta 2 O 5 -PbO 2 anode and Ti/TiO 2 NTs/PbO 2 anode increased by 40.0% and 27.1%, respectively. The highest rate of k .OH on Ti/TiO 2 NTs/Ta 2 O 5 -PbO 2 anode was 12.4 μmol (L min) −1 . The organic dyes are oxidized into CO 2 and H 2 O by . OH radical. The reaction process and mechanism during the electrochemical degradation were discussed.