The adsorption kinetics of asphaltenes at the toluene − silica interface has been measured for nine solution concentrations C S (from 5 to 3000 mgL - 1 ) Results could be adjusted to an irreversible second-order adsorption kinetics, where the adsorption rate k was strongly dependent on concentration. Thus a large reduction in k was observed when C S was increased in the studied concentration range. This rate reduction was accounted for in terms of adsorption of aggregates formed in solution. The step − wise trends observed for the adsorption isotherms of asphaltenes on mineral surfaces, could be reproduced using the above k values.
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Acevedo et al. (2003) studied this question.