Abstract

In this paper, Fe³⁺ was immobilized in fly ash using a thermal procedure. Fe³⁺- modified fly ash was used as heterogeneous Fenton catalyst for the degradation of Reactive Blue 182 (RB 182). Some properties of raw and modified fly ashes were characterized by SEM, EDX and XRD techniques. Effects of some key operating parameters such as catalyst dose, pH, and hydrogen peroxide concentration on the treatment efficiency were studied and discussed. Kinetic rate constant of treatment process was also determined. The experimental results show that the heterogeneous Fenton technique using modified fly ash/H₂O₂ is a suitable method for removing RB 182 from aqueous solution. At the optimum conditions includes catalyst dose of 1 g/l; hydrogen peroxide of 3,92 mM; pH 3; contact time for 90 minutes; approximately 90% of RB 182 was removed; the kinetics fitted well for pseudo first-order reaction.