Effect of Operating Parameters on Electrochemical Degradation of Alizarin Red S on Pt and BDD Electrodes

Abstract

The degradation of Alizarin Red S by electro-generated species using Pt and BDD electrodes was performed. The results were explained by the generation of OH * radical, S2O8 2− at BDD electrode and active chlorine species at Pt electrode. The slow degradation is affected by the current density, initial pH, temperature, initial dye concentration and the nature of the supporting electrolyte. However, the ionic strength showed a negligible effect on both electrodes. In the presence of KCl, the intermediates produced during the degradation are similar at both electrodes. In the presence of sulfate (at BDD electrode), the rate and the mechanism of the degradation are different from those in the presence of KCl. TOC analysis showed total mineralization of AR S.

Effect of Operating Parameters on Electrochemical Discoloration of Acid Blue 1 on BDD Electrode

“…The increase in the degradation rate is related to the increase in the production rate of chlorine species. Similar results were obtained with other organic compounds [25,26]. The reason is that a higher amount of chlorine/hypochlorite will be generated, while increasing the chloride concentration, due to the increased mass transport of chloride ions to the anode surface [25].…”

“…The reason is that a higher amount of chlorine/hypochlorite will be generated, while increasing the chloride concentration, due to the increased mass transport of chloride ions to the anode surface [25]. This result confirms the discoloration and the degradation of the organic compounds via the electro-generated chloride species [26,27]. The discoloration of the rate constant is not negligible when the volume of KCl added is zero, since the powder of AB1 contains already sulfate and chloride as impurities.…”

Solar-to-hydrogen peroxide conversion of photocatalytic carbon dots with anthraquinone: Unveiling the dual role of surface functionalities

“…The AQ molecules used for the functionalization displayed distinct absorbance at 258 nm and 335 nm owing to the π-π* transition of benzoid and quinoid. 21 The spectra of the CD-AQ displayed the presence of absorption peaks of both CD and AQ molecules, indicating successful surface functionalization. The characteristic PL spectra of both CD and CD-AQ were found to depend on the excitation wavelength (Fig.…”

Adsorption of Malachite Green and Alizarin Red S Dyes Using Fe-BTC Metal Organic Framework as Adsorbent

“…The concentration of dye in the solutions before and after adsorption experiments was determined using a Cary 60 UV-Vis spectrophotometer (Agilent) ( λ = 516 nm for ARS and 620 nm for MG). The solutions were diluted in Tris-HCl buffer (pH 7, 10 mM) to ensure a constant pH during the measurements, since the absorbance peaks of the dyes, especially in the case of ARS, are influenced by pH [ 68 , 69 ].…”