K.L. Tan, B.H. Hameed, Insightinto the adsorption kinetics models for the removal of contaminants fromaqueous solutions, Journal of the Taiwan Institute of Chemical Engineers, In
Press, Available online 21 March 2017. DOI: http://dx.doi.org/10.1016/j.jtice.2017.01.024
Highlights
- Introduction to common kinetic models for pollutants adsorption in aqueous phase.
- Remarks on the uses and abuses of pseudo-first-order and pseudo-second-order models.
- Highlight and clarification of common errors and loopholes in kinetic studies.
- Discussion of linear vs. nonlinear fitting for correlating kinetic data.
- Discussion of fixed bed models, their naming confusion, and applicability.
Abstract
The past decade has seen a boom in environmental adsorption studies on the adsorptive removal of pollutants from the aqueous phase. A large majority of works treat kinetic modeling as a mere routine to describe the macroscopic trend of adsorptive uptake by using common models, often without careful appraisal of the characteristics and validity of the models. This review compiles common kinetic models and discusses their origins, features, modified versions (if any), and applicability with regard to liquid adsorption modeling for both batch adsorption and dynamic adsorption systems. Indiscriminate applications, ambiguities, and controversies are highlighted and clarified. The appropriateness of linear regression for correlating kinetic data is discussed. This review concludes with a note on the current scenario and the future of kinetics modeling of liquid adsorption.
