Abstract
Hydrogen peroxide (HP) is widely used in advanced oxidation processes (AOPs). This study evaluates the chemical oxygen demand (COD) removal efficiency of Acid Orange 8 (AO 8) at a higher concentration by modified Fenton processes using substituted HP, such as tert-butyl hydroperoxide (TBHP), sodium perborate (SPB), and sodium persulphate (SPS) as oxidising agents. Under optimal conditions, COD removal was found to be 72.8 and 58.9% at pH 3.0 and 6.5 in the Fenton process in 300 min. The COD removal efficiency of different systems is in the order: Fe2+/SPB > Fe2+/HP > Fe2+/TBHP > Fe2+/SPS indicating the possibility of using SPB as a substitute for HP and SPS. The order of efficiency is attributed, among other factors, to their ability to produce HO• radicals. Various anions are shown to exhibit an inhibitory effect in the order: I– > Br– > F– > Cl– > SO4 2– > NO3–. The inhibitory effect of Cl– is observed at higher concentrations than F– and Br–, even though I– displays inhibition at all concentrations. Finally, COD removal kinetics and the degradation mechanism, based on the identified intermediate products, were determined in this study.
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