Removal of Pb2+ ions from aqueous solution using the adsorption process onto Ti-MCM-41 has been investigated. A simplified surface complexation model was used to calculate the conditional binding constants for surface complexation of Pb2+ ions onto Ti-MCM-41, Dynamic modeling of the adsorption showed that the first-order reversible kinetic model held for the adsorption process. The overall rate constant k', the adsorption rate constant k(1), the desorption rate constant k(2), and the equilibrium constant K-e for the adsorption process were calculated from the results of the thermodynamic analysis, and standard free energy Delta G degrees, standard enthalpy Delta H degrees, and standard entropy Delta S degrees of the adsorption process were also calculated. Equilibrium modeling of the adsorption showed that the adsorption of Pb2+ ions was fitted to a Freundlich isotherm.