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• W2963152022 abstract "Abstract The pseudo first- (PFO) and second-order (PSO) kinetic models have been extensively applied to study the kinetics of interfacial processes, for example, separation or removal of toxic metal ions from aqueous solution by adsorption. However, the two models were used without any specialization of operating conditions and their theoretical origin is not well understood. The aim of the present study is to provide clear physical understanding on the relationships of the Langmuir kinetics with the two models. The conditions under which the Langmuir kinetics can be reduced to the simplified models and their explicit dependence on operating conditions and isotherm parameters are provided. We adopt the square root method to obtain two roots of the differential Langmuir rate equation at equilibrium, then prove that one root is the surface coverage fraction and the other is the reciprocal of adsorption efficiency at equilibrium, and show that the root ratio is a critical factor in assessing the applicability of the PFO and PSO models. This critical factor solely depends on the ratio of available adsorbate to adsorbent capacity and the product of the Langmuir equilibrium constant and adsorbent capacity. The reduction of the Langmuir kinetics to the PFO and PSO models can be valid only under extreme conditions. The system with too high or too low available adsorbate relative to the maximum adsorbent capacity or with too small adsorption rate constant multiplied by the maximum adsorbent capacity relative to the desorption rate constant might be approximately described by the PFO model. On the other extreme that available adsorbent capacity matches available adsorbate and desorption rate constant is negligible compared with the adsorption rate constant multiply by the maximum adsorbent capacity, the PSO model could replace the Langmuir kinetics. As such, the desorption part in the Langmuir rate equation disappears and the reversible Langmuir kinetics is reduced to irreversible process. Obviously, this is hardly encountered in reality. The present study offers physical insights into the relationships between the Langmuir kinetics with the PFO and PSO models in terms of operating conditions and isotherm parameters." @default.
• W2963152022 created "2019-07-30" @default.
• W2963152022 creator A5038638469 @default.
• W2963152022 date "2019-12-01" @default.
• W2963152022 modified "2023-10-06" @default.
• W2963152022 title "Physical insights into kinetic models of adsorption" @default.
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• W2963152022 doi "https://doi.org/10.1016/j.seppur.2019.115832" @default.
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