Application of TiO2-nanotubes/PbO2 as an anode for the electrochemical elimination of Acid Red 1 dye
In this study, galvanostatic electrolysis, through the use of the platinum supported on Ti (Ti/Pt) and Ti/TiO 2 -nanotubes/PbO 2 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 Na 2 SO 4 as supporting electroly...
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Published in | Journal of solid state electrochemistry Vol. 23; no. 2; pp. 351 - 360 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
12.02.2019
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | In this study, galvanostatic electrolysis, through the use of the platinum supported on Ti (Ti/Pt) and Ti/TiO
2
-nanotubes/PbO
2
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 Na
2
SO
4
as supporting electrolyte, applying 7.5 and 60 mA cm
−2
. From the voltammetric curves, it was possible to understand that Ti/TiO
2
-nanotubes/PbO
2
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/TiO
2
-nanotubes/PbO
2
anode. The electrolytic process was monitored by the UV–visible spectrometry and the chemical oxygen demand (COD). Results clearly show that Ti/TiO
2
-nanotubes/PbO
2
anode performs better than Ti/TiO
2
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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ISSN: | 1432-8488 1433-0768 |
DOI: | 10.1007/s10008-018-4134-5 |