Implications of apparent pseudo-second-order adsorption kinetics onto cellulosic materials: A review

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 a...

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Veröffentlicht in:Bioresources Jg. 14; H. 3; S. 7582 - 7626
Hauptverfasser: Hubbe, Martin, Azizian, Saeid, Douven, Sigrid
Format: Journal Article
Sprache:Englisch
Veröffentlicht: North Carolina University 01.08.2019
North Carolina State University
Schlagworte:
Cellulose
Chemical engineering
Engineering, computing & technology
Ingénierie chimique
Ingénierie, informatique & technologie
Kinetics of adsorption
Mesoporous substrates
Wood-based materials
ISSN:1930-2126, 1930-2126
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Zusammenfassung: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.
Bibliographie:scopus-id:2-s2.0-85074599409
ISSN:1930-2126
1930-2126
DOI:10.15376/biores.14.3.7582-7626