Adsorption of basic dyes on granular acivated carbon and natural zeolite

The adsorption of basic dyes from aqueous solution onto granular activated carbon and natural zeolite has been studied using an agitated batch adsorbe r. The influence of agitation, initial dye concentration and adsorbent mass has been studied. The parameters of Langmuir and Freundlich adsorption iso therms have been determined using the adsorption data. Homogeneous diffusio n model (solid diffusion) combined with external mass transfer resistance i s proposed for the kinetic investigation. The dependence of solid diffusion coefficient on initial concentration and mass adsorbent is represented by the simple empirical equations. (C) 2001 Elsevier Science Ltd. All rights r eserved.