Abstract
Despite extensive literature regarding the effect of solvent on numerous physicochemical processes, the solvent effect on the adsorption kinetics of a surface-active compound is yet to be explored. This study first investigated the adsorption kinetics of dibutyl phthalate (DBP) in 1 wt% aqueous methanol (MeOH) solvent: dynamic and equilibrium surface tension (ST) data were measured using a pendant bubble tensiometer and the resultant ST data were examined via theoretical simulation. The adsorption of DBP onto a clean air-water interface was found to be of mixed-control (Frumkin model with K = −0.89), indicating a non-negligible interaction amongst the adsorbed DBP molecules. Subsequent examination of DBP’s adsorption kinetics in 0, 1, and 5 wt% MeOH(aq) solvents revealed a strong solvent effect on the (i) dynamic and equilibrium ST relaxations, (ii) dependency of surface concentration on DBP concentration, and (iii) intermolecular interaction amongst the adsorbed DBP molecules. Besides, although all the adsorption mechanisms of DBP in these three solvents were of mixed control, it was observed to be more biased towards diffusion-control at increasing MeOH concentration.
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