Automated System for Study of the Crystal Violet Mineralization in Water by the Electro-Fenton Method

Abstract-The mineralization of acidic aqueous solutions with 0.166 to 1.333 mM Crystal Violet (CV) in 50 mM Na2SO4, 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 six operating factors on the mineralization degree has been investigated: anode material (platinum versus boron doped diamond), pH, Fe (II) dose, current intensity, temperature and initial concentration of CV. The mineralization degree had a maximum (91.18 %) after 420 minutes of electrolysis, under the following optimal conditions: boron doped diamond (BDD) anode, pH3, 1mMFe (II), 300 mA, 308 K, and 100 ppm initial total organic carbon (TOC)