A Comparative Electrochemical-Ozone Treatment for Removal of Phenolphthalein

The degradation of aqueous solutions containing phenolphthalein was carried out using ozone and electrochemical processes; the two different treatments were performed for 60 min at pH 3, pH 7, and pH 9. The electrochemical oxidation using boron-doped diamond electrodes processes was carried out using three current density values: 3.11 mA.cm(-2), 6.22 mA.cm(-2), and 9.33 mA.cm(-2), whereas the ozone dose was constantly supplied at 5 +/- 0.5 mgL (1). An optimal degradation condition for the ozonation treatment is at alkaline pH, while the electrochemical treatment works better at acidic pH. The electrochemical process is twice better compared with ozonation.