Decolorization Kinetics of Organic Pollutant Dye Compounds from Wastewater

The removal of colored-toxic materials from industrial wastewater has been subject to investigations since years. There are more than several methods to overcome these problems. In this article, sodium sulfite as a scavenger was used to remove the color of basic red 46 and methylene blue in solution as model pollutant materials in water. Color removal kinetics was studied by using sodium sulfite amount, pH of the solution, time and temperature as parameters. The effect of these parameters was reported according to the decay kinetics of absorbance of the dye compounds in solution by using molecular absorption spectroscopy. It observed that the color degradation of basic red 46 obeys bi-exponential decay whereas methylene blue obeys single exponential decay. The kinetic rate constants were determined from fit of the absorbance decay studies and temperature dependence of process was discussed with Arrhenius equation.