Electrochemical Degradation of Methyl Red Using Ti/Ru_(0.3)Ti_(0.7)O2: Fragmentation of Azo Group

摘要

In this work, anodic oxidation of methyl red (MR) using Ti/Ru_(0.3)4Ti_(0.66)O2 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.