Electro-oxidation combined with electro-Fenton for decolorization of caramel colorant aqueous solution using BDD electrodes

This study focused on the effects of electro-oxidation combined with electro-Fenton process using boron-doped diamond (BDD) electrodes degradation biorefractory food colorant caramel. Aqueous solutions containing Caramel Class IV, III and Acid Orange 7 were comparatively treated by electrochemical advanced oxidation processes, including (EO), (EF) (EO + EF). The experiments performed in a stirred flask reactor an inflator pump coupled undivided cell BDD Ti/Pt electrodes. In EF EO process, Fe 2+ was added as catalyst. independent parameters air flow rate, concentration current intensity range 0.5–1.5 L/min, 0.05–0.2 mM 0.4–1.5 A, respectively, studied. effect electrode material decolorization also examined. pigment enhanced increasing rate due to greater production active species. color decay fitted pseudo-first-order kinetics. Complete caramel realized under all experimental conditions highest kinetic constant 2.3*10 −2 min −1 found these conditions. highlighted potential for efficient colorant. • Electro-oxidation (EO) examined remove from water. Two used: Titanium/Platinum (Ti/Pt). Total achieved removal at 1.5 L/min 0.05 , 1.5A 154-min. order efficiency was: < or anode.