Abstract
The utility of Weber−Morris and Lagergren linear representations for describing the kinetics of sorption at solid/solution interfaces controlled by intraparticle diffusion is discussed. The effects of different sorbent particle sizes and nonlinear adsorption isotherm equations (including the nonlinearity caused by surface energetic heterogeneity) and the changing sorbate concentration in the bulk phase have been taken into account. The conclusion can be drawn that both Lagergren and Weber−Morris plots seem to be general linear representations inherent in the intraparticle diffusion model and can be used for most adsorption systems. However, for quantitative analysis of kinetic data, more sophisticated methods need to be applied. Moreover, reliable conclusions can be drawn about a given system only by combined analysis of kinetic and equilibrium data.
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