It is obtainable from the literature that most liquid-phase adsorption processes do not conform to pseudo- 1st order model and tend to be described by pseudo-second order Kinetics. Pseudo second order corroborates chemisorption process of adsorption. The question: does it mean that liquid-phase adsorption system is more likely to follow chemisorption process?
Neither the so-called PFO (exponential or logarithmic function) nor the so-called PSO (hyperbolic function) make physical sense. If someone writes otherwise, he/she tells fairy tales. And many like fairy tales and repeating nonsense.
pseudo-second-order model for the description of adsorption kinetics has been widely applied in liquid-phase adsorption systems. To determine whether the sorption phenomenon is through physisorption or chemisorption we can go from isotherm study followed by the kinetic and thermodynamic analysis which gives a clear insight into the mechanism of adsorption.
pseudo-second-order model give the information about adsorption mechanism. But the chemisorption depends on pollutants characteristic and adsorbent characteristic (ionic charge, functional group)
Abilarasu Annamalai, Can you prove the cause and effect relationship between the empirical hyperbolic function (the so-called PSO model) and the adsorption mechanism, or do you repeat rumors heard somewhere?
Aju Mathew George and others, Unfortunately, you are absolutely right that the empirical hyperbolic function (the so-called PSO model) is very often used to describe the kinetic data of batch adsorption. Such a description, however, is scientifically worthless. It's just data archiving.