Abstract
This work shows the decolorization of mono-azo dye Rifafix Red 3BN by environmentally friendly advanced oxidation processes using natural hematite. Our main focus is on the utilization of naturally occurring hematite for the treatment of wastewater. The experimental variables were initial concentration of dye, catalyst concentration, oxidant concentration, and reaction temperature. The optimum conditions were obtained as follows: catalyst dose 2 g/L, H2O2 concentration 20 mM, pH 3 and temperature 25 °C at a reaction time of 60 min. The % decolorization was increased from 55.91% to 93.89% using optimum conditions with initial 100 ppm dye. To assess the competence of different types of AOPs, the organic mono-azo dye was subjected to oxidize using various photochemical processes.