Abstract: In this study, the decolorization of turquoise blue dye has been investigated by applying Advanced Oxidation Processes (AOPs) such as ozonation, O3/H2O2 and Fenton. The effect of oxidant concentration on color removal has been studied for 100, 300 and 500 ppm of synthetic dye solution. It has been observed that initial dye concentration has an inverse effect on the efficiency of oxidation process for applied AOPs. The color removal efficiency using hydrogen peroxide alone was found to be 23% for 100 ppm dye solution. However, the color treatment efficiency reached to 57% when hydrogen peroxide was exposed along with FeSO4 in Fenton process. Similarly, ozone when combined with hydrogen peroxide improved the efficacy of color removal from 72 to 90% for 100 ppm dye solution. The applied processes followed the trend O3/H2O2>O3>Fenton process>H2O2 for color removal at constant pH of 6 and 25°C temperature.