Implications of apparent pseudo-second-order adsorption kinetics onto cellulosic materials: A review
By M. Hubbe, S. Azizian, S. Douven. BioResources, 2019
512 citations recorded by the source corpus.
The pseudo-second-order (PSO) kinetic model has become among the most popular ways to fit rate data for adsorption of metal ions, dyes, and other compounds from aqueous solution onto cellulose-based materials. This review first considers published evidence regarding the validity of the mechanistic assumptions underlying application of the PSO model to adsorption kinetics. A literal interpretation of the model requires an assumption that different adsorption sites on a solid substrate randomly collide with each other during a rate-limiting mechanistic step. Because of problems revealed by the literature regarding the usual assumptions associated with the PSO model, this review also considers how else to account for good fits of adsorption data to the PSO model. Studies have shown that adsorption behavior that fits the PSO model well often can be explained by diffusion-based mechanisms. Hypothetical data generated using the assumption of pseudo-first-order rate behavior has been shown to fit the PSO model very well. In light of published evidence, adsorption kinetics of cellulosic materials is expected to mainly depend on diffusion-limited processes, as affected by heterogeneous distributions of pore sizes and continual partitioning of solute species between a dissolved state and a fixed state of adsorption.
Subfields: Electrochemistry, Organic Chemistry, Physical and Theoretical Chemistry
View Paper: https://www.semanticscholar.org/paper/005599fee5c41a2ab3fd17aad615e36f5cb63cc9
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Citations in the corpus
- A Critical Overview of Adsorption Models Linearization: Methodological and Statistical Inconsistencies (2021, background): “Although it is not the aim of this work to question the validity of these asseverations, some authors have brought attention to the fact that PFO and PSO are rather empirical models that lack a strong theoretical foundation, suggesting the use of models based on principles that feasibly describe the”