Article (Scientific journals)
Implications of Apparent Pseudo-Second-Order Adsorption Kinetics onto Cellulosic Materials: A Review
Hubbe, Martin A.; Azizian, Saeid; Douven, Sigrid
2019In BioResources, 14 (3), p. 7582-7626
Peer reviewed
 

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Keywords :
Kinetics of adsorption; Cellulose; Wood-based materials; Mesoporous substrates
Abstract :
[en] 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.
Disciplines :
Chemical engineering
Author, co-author :
Hubbe, Martin A.;  North Carolina State University > Department of Forest Biomaterials
Azizian, Saeid;  Bu Ali Sina University > Department of Physical Chemistry
Douven, Sigrid ;  Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry
Language :
English
Title :
Implications of Apparent Pseudo-Second-Order Adsorption Kinetics onto Cellulosic Materials: A Review
Publication date :
2019
Journal title :
BioResources
eISSN :
1930-2126
Publisher :
North Carolina University, Raleigh, United States - North Carolina
Volume :
14 (3)
Pages :
7582-7626
Peer reviewed :
Peer reviewed
Available on ORBi :
since 28 August 2019

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