Pseudo-second order model for sorption processes

A literature review of the use of sorbents and biosorbents to treat pollute d aqueous effluents containing dyes/organics or metal ions has been conduct ed. Over 70 systems have been reported since 1984 and over 43 of these repo rted the mechanism as being a pseudo-first order kinetic mechanism. Three s orption kinetic models are presented in this paper and have been used to te st 11 of the literature systems previously reported as first order kinetics and one system previously reported as a second order process. In all 12 sy stems, the highest correlation coefficients were obtained for the pseudo-se cond order kinetic model. (C) 1999 Elsevier Science Ireland Ltd. All rights reserved.