Abstract
In this study, galvanostatic electrolysis, through the use of the platinum supported on Ti (Ti/Pt) and Ti/TiO2-nanotubes/PbO2 anodes, was conducted in an electrochemical cell with 0.2 L of solution containing 100 mg dm−3 of the textile dye Acid Red 1 (AR1) using Na2SO4 as supporting electrolyte, applying 7.5 and 60 mA cm−2. From the voltammetric curves, it was possible to understand that Ti/TiO2-nanotubes/PbO2 electrode has high oxygen evolution overpotential than Ti/Pt anode. A direct electron transfer reaction is attained between the dye molecules and Ti/Pt surface, at lower currents. Conversely, the AR1 oxidation involves water decomposition intermediates, mainly ·OH radicals at Ti/TiO2-nanotubes/PbO2 anode. The electrolytic process was monitored by the UV–visible spectrometry and the chemical oxygen demand (COD). Results clearly show that Ti/TiO2-nanotubes/PbO2 anode performs better than Ti/TiO2 in removing ARI due to the electrosynthesis of strong oxidants on its surface (·OH and persulfates), achieving a higher oxidation rate, higher current efficiency, and less energy consumption than Ti/Pt electrode.
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The authors thank the financial support provided by National Council for Scientific and Technological Development (CNPq - 446846/2014-7 and CNPq- 401519/2014-7, Brazil) and they also thank Industrie De Nora S.p.A. (Milan, Italy) for providing the Ti/Pt electrode.
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Santos, J.E.L., de Moura, D.C., da Silva, D.R. et al. Application of TiO2-nanotubes/PbO2 as an anode for the electrochemical elimination of Acid Red 1 dye. J Solid State Electrochem 23, 351–360 (2019). https://doi.org/10.1007/s10008-018-4134-5
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DOI: https://doi.org/10.1007/s10008-018-4134-5