Kinetic Study of the Electrochemical Oxidation of Methylene Blue with Pt Electrode

Abstract

Kinetic study of the indirect oxidation of methylene blue on Pt electrode in presence of several strong electrolytes is undertaken. Different operating conditions that affected the treatment process were studied in order to find the best conditions. The order with respect to methylene blue is zero order in presence of chloride, but it is second order in presence of bromide. The oxidation rate was affected by current density, halide concentration (KCl, KBr), nature of supporting electrolyte and initial pH. However, the initial dye concentration and temperature did not show a significant effect. The oxidation of methylene blue in presence of iodide, fluoride and sulfate is absent, but it is important in presence of chloride and bromide. The product of the indirect oxidation is the chloronated (bromonated) methylene violet bernthsen.

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

“…According to the literature [58], if the contribution of the double layer charge is negligible, the initial decrease in current density can be related to the growth of a passive film on the electrode surface. The current density decreases with time according to the following relationship [59]:…”

Effect of poly(methyl methacrylate-co-N-vinyl-2-pyrrolidone) polymer on J55 steel corrosion in 3.5% NaCl solution saturated with CO2

“…For the same reason, we observe the faster attaining of steady state of ÀS and a and their closer values Table 1 Electrochemical impedance parameters at an amplitude of 10 mV for J55 steel in 3.5% NaCl solution saturated with CO 2 in absence and presence of P(MMA-co-VP). to À1 and À908 in the presence of inhibitors than in their absence, reflecting the action of the inhibitor [27].…”

Theoretical and experimental approach of inhibition effect by sulfamethoxazole on mild steel corrosion in 1‐M HCl

“…The equilibrium constant of adsorption K ads is related to standard free energy change of adsorption (ΔG 0 ads ) by the following expression. 37 K ads ¼ 1=55:5 exp ΔG 0 ads =RT ; (8) where R is the universal gas constant, 55.5 is the concentration of water in solution in mol/L, and T is the absolute temperature. The plot of θ against log C is shown in Figure 8.…”