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Adsorption kinetics with time delay

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A theory of adsorption kinetics of solutes onto a solid surface from the solution phase is proposed in which a time delay is introduced into the solute concentration on the surface. Equations governing the adsorption kinetics are similar to those for membrane transport with time delay (Ohshima and Kondo, Biophys. Chem. (1989) 33: 303). It is found that introduction of time delay τ causes, under certain conditions, overshoot or oscillation in the solute concentrations, both in the solution phase and on the surface. The criterion for oscillation depends on the scaled delay time ατ, the ratio of the possible maximum amount of solutes adsorbed on the surface to the total solute amountR, and the scaled binding constantK. When the number of the binding sites is small, the criterion for oscillation is expressed as γ>exp(−1), where γ=(ατ/K) exp(ατ).

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Ohshima, H., Fujita, N. & Kondo, T. Adsorption kinetics with time delay. Colloid Polym Sci 270, 707–710 (1992). https://doi.org/10.1007/BF00654047

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Key words

  • Adsorptionkinetics
  • timedelay