Cyclic Voltammetric Investigations of Thiazine Dyes on Modified Electrodes

Abstract

Electrochemical behavior of five progressively alkylated thiazine dyes has been investigated at glassy carbon/montmorillonite and glassy carbon/zeolite electrodes. Quantitative characteristics, associated with the positions of peak potentials (Ea and Ec) and current ratios (ia/ic), are measured with scan rates. The peak current observed in the modified electrodes is dependent on both the porosity and nature and number of sites involved in partitioning the complex into film. The values of diffusion coefficient for different dyes have been calculated from electrochemical data. It is suggested that in clay-modified electrode along with physical diffusion the process of electron hopping seems to be most likely.

Voltammetric behaviors of an emerging pollutant benzotriazole on multiwall carbon nanotubes (MWNTs)—Nafion modified electrode in various pH mediums

“…This is due to the relatively loose and cribrate microstructure of MWNTs relative to the bare GCE. Furthermore, the presence of Nafion was thought to force BTA into a swollen MWNT configuration suitable for charge transport to reach the GCE as well as physical diffusion via electron hopping [32].…”

Deciphering electron-shuttling characteristics of thionine-based textile dyes in microbial fuel cells

“…As shown in Table 3, azure A (n 2.94) owned higher capability to transfer electrons than azure C (n 1.05) and thionine (n 1.16), suggesting the most promising electron-shuttling potential of azure A. Note that such an electron-transferring capability is also strongly dependent upon the conditions of test medium (e.g., different results for strongly acidic at 0.1 M H 2 SO 4 and neutral pH PBS condition in this work) [26,27].…”

Cr(VI)-Mediated Homogeneous Fenton Oxidation for Decolorization of Methylene Blue Dye: Sludge Free and Pertinent to a Wide pH Range

“…Cyclic voltammograms of Cr(VI)+MB in the presence and absence of H 2 O 2 were recorded using KNO 3 as the supporting electrolyte and glassy carbon electrode as the working electrode in the potential range of 0.3 to −0.8 V versus Ag/AgCl as the reference electrode, with a scan rate of 0.1 V/s. 18,19 Only MB's anodic and cathodic signals are obtained using the conditions mentioned above, and Cr(VI) signals do not interfere with MB signals.…”

“…Cyclic voltammogram of Cr­(VI)+MB before the addition of H 2 O 2 showed a single cathodic signal at −0.5 V and a single anodic signal at −0.32 V. After the degradation of MB in the Cr­(VI)/H 2 O 2 system, anodic and cathodic peaks at −0.5 and −0.32 V disappeared, indicating the complete degradation of MB. Cyclic voltammograms of Cr­(VI)+MB in the presence and absence of H 2 O 2 were recorded using KNO 3 as the supporting electrolyte and glassy carbon electrode as the working electrode in the potential range of 0.3 to −0.8 V versus Ag/AgCl as the reference electrode, with a scan rate of 0.1 V/s. , Only MB’s anodic and cathodic signals are obtained using the conditions mentioned above, and Cr­(VI) signals do not interfere with MB signals.…”