Prediction of Binary System for Kinetics of Batch Adsorption using Basic Dyes onto Activated Carbon

The present work develops the film-homogeneous diffusion model for multicomponent batch adsorption and applies to it two binary mixtures of basic dyes, namely (Basic Red 22 + Basic Yellow 21) and (Basic Red 22 + Basic Blue 69), onto activated carbon F400. The adsorption rate of each component j is measured by the external mass transfer coefficient kfj and intraparticle solid diffusivity Dsj. A single kfj has succeeded to describe the whole experimental range of each component while Dsj has increased exponentially with the initial sorbate concentration Coj. Equilibrium has been successfully described by the empirically extended Freundlich isotherm. © 1990