Electrochemical Degradation of Methyl Red Using Ti/Ru0.3Ti0.7O2: Fragmentation of Azo Group

Autor: Crislânia Carla de Oliveira Morais, Maiara Barbosa Ferreira, Suely S.L. Castro, Danyelle Medeiros de Araújo, Carmem Lúcia de Paiva e Silva Zanta, André Jailson Cabral da Silva
Rok vydání: 2013
Předmět:
Zdroj: Electrocatalysis. 4:312-319
ISSN: 1868-5994
1868-2529
DOI: 10.1007/s12678-013-0166-x
Popis: In this work, anodic oxidation of methyl red (MR) using Ti/Ru0.34Ti0.66O2 as anode was investigated for understanding of the fragmentation of chromophore group, as initial stage of MR degradation. Cyclic voltammetry was employed to evaluate the behavior of electrode in absence and presence of organic compound, indicating that the oxidation of MR occurs approximately at 1.45–1.55 V. UV–vis spectra showed that the color removal is attained independently of current density applied. The changes on absorbance band of MR indicated that a possible fragmentation of azo group was attained. The analysis of inorganic species released during MR degradation suggested that the release of nitrogen inorganic ions like NO3− as well as NO2− ions is a consequence of chromophore group cleavage, as it also observed by the changes of the band at 1,451 cm−1 (−N double bond), during the initial electrolysis times, achieved by Fourier-transform infrared spectrometry analyses. The findings presented herein are described and discussed in the light of the existing literature data.
Databáze: OpenAIRE
Externí odkaz: