Studies on the Adsorption Kinetics in Process of Two Dyes Adsorbed by Powder Activated Carbon

The adsorption characters of two dyes(Reactive Brilliant Blue KN-R;Disperse Deep Blue S-3BG)on powder activated carbon in aqueous solution were studied.The adsorption mechanism was developed in view of adsorption kinetics.The results show that the equilibrium adsorption capacity of Reactive Brilliant Blue KN-R is larger than Disperse Deep Blue S-3BG under the same conditions,and both the adsorption behavior of two dyes could be described by pseudo second-order kinetic mode1accurately.Moreover,the adsorption rate of the powder activated carbon to the dyes is not only controlled by intra-particle diffusion but also by extra-particle diffusion process.