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- Title
Application of TiO<sub>2</sub>-nanotubes/PbO<sub>2</sub> as an anode for the electrochemical elimination of Acid Red 1 dye.
- Authors
Santos, José Eudes L.; de Moura, Dayanne Chianca; da Silva, Djalma Ribeiro; Panizza, Marco; Martínez-Huitle, Carlos A.
- 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.
- Subjects
ELECTRIC batteries; ELECTROCHEMICAL analysis; ELECTROLYTES; ELECTROSYNTHESIS; NANOTUBES; OXIDIZING agents; ENERGY consumption
- Publication
Journal of Solid State Electrochemistry, 2019, Vol 23, Issue 2, p351
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-018-4134-5