Fenton-like oxidation of Reactive Black 5 dye was carried out using iron(III) impregnated on rice husk ash
as heterogeneous catalyst. The catalyst was prepared by wet impregnation method and characterized.
The effectiveness of this catalyst in degradation and decolorization of the dye, as well as the influence
of reaction parameters on the catalytic activity was discussed. The effects of pH, the initial hydrogen
peroxide concentration, the catalyst loading, and the temperature on the oxidative degradation and
decolorization of Reactive Black 5 have been assessed. The best degradation efficiency (59.71%) and
decolorization efficiency (89.18%) was obtained at temperature = 30 ◦C, pH = 3, [H2O2]0 = 4 mM, catalyst
loading = 0.5 g/L for initial dye concentration of 100 mg/L.