Study of O₃/S₂O₈^2- Advanced Oxidation Processes (AOPs) for Removal of Dye Industrial Effluents

Water Research Group (WAREG), School of Environmental Engineering, Universiti Malaysia Perlis (UniMAP), Kompleks Pusat Pengajian Jejawi 3, 02600 Arau, Perlis, Malaysia

^* Corresponding author: zulzikrami@unimap.edu.my

Abstract

This research was carried out to study the efficiency of O₃/S₂O₈^2- system in removal of Reactive Red 120 (RR120) dye sample. Different operating parameter such as pH, initial dye concentration and persulfate dosage were studied to evaluate the performance on removing colour and COD. The removal of colour and COD achieved higher efficiency at pH 7, 100 mg/L of initial dye concentration and persulfate dosage of 5 g S₂O₈^2-/1 g RR120. O₃/S₂O₈^2- with the most effective conditions experienced effective decolourization and degradation of organic pollutants than O₃ only. Furthermore, it achieved faster breakdown of azo bond and aromatic groups than O₃ after treatment as observed with UV-Vis absorption spectra. The FT-IR analysis obtained new absorption peak that represents alkenes after 20 min of O₃ treatment whereas mostly of the absorption bands of O₃/S₂O₈^2- flattened.