The mineralization of acidic aqueous solutions with 0.166 to 1.333 mM Crystal Violet (CV) in 50 mM Na 2 SO 4 as background electrolyte has been studied by the electro-Fenton method, where the oxidizing hydroxyl radicals were produced from the Fenton reaction between added ferrous ions and hydrogen peroxide generated at a oxygen-diffusion cathode. The influence of a new operating factor on the mineralization degree has been investigated: anode material (platinum versus boron doped diamond). Other five factors (pH, Fe (II) dose, current intensity, temperature, and initial concentration of CV) have been kept constant at the optimal values found in a previous work. The kinetic curves have been correlated through a new kinetic model including two pseudo-first order rate constants.
This paper presents a study on mineralization of the triphenyl-methan dye, Crystal Violet (CV) in aqueous medium at pH 3.0, by environmentally friendly electrochemical methods such as Electro-Fenton (EF) processes using boron-doped diamond (BDD) anode, in terms of effects of the experimental parameters on the mineralization degree. Experimental data obtained on EF method allow identifying the main factors influencing the rate of mineralization process: the nature of the anode (Pt / BDD), temperature, pH, current intensity, initial concentration of CV, dose of Fe 2 + and Cu 2 + ions. The maximum of the degree of mineralization achieved was 97.14%, under the condition that we may consider the best: BDD anode, pH = 3.0, I = 300 mA, T = 308 K, the initial concentration of CV = 100 ppm, iron dose 1.0 mM and 0.25 mM dose of copper.
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