Studies of the adsorptive decoloration of aqueous solutions by MDFSD

Breakthrough plots were obtained beside the three isotherms. The breakthrough times were found as CV > MB > BG. These results were compatible to the adsorptivity estimated from the isotherms. It was found through this study that adsorption of CV followed pseudo-first order kinetics, the adsorption rate constant increases with increasing temperature, adsorbent concentration, MDFSD dose and pH. The adsorption equilibrium was shifted toward higher adsorption capacity by increasing the substrate concentration, temperature and pH. The adsorption data fit Freundlich, Langmuir, but attained a better correlation with the Langmuir model. Langmuir and freundlich constants, activation enthalpy of adsorption and the adsorption thermodynamic parameters were obtained.