title: Kinetic Uptake Studies of Powdered Materials in Solution.
abstract: Challenges exist for the study of time dependent sorption processes for heterogeneous systems, especially in the case of dispersed nanomaterials in solvents or solutions because they are not well suited to conventional batch kinetic experiments. In this study, a comparison of batch versus a one-pot setup in two variable configurations was evaluated for the study of uptake kinetics in heterogeneous (solid/solution) systems: (i) conventional batch method; (ii) one-pot system with dispersed adsorbent in solution with a semi-permeable barrier (filter paper or dialysis tubing) forin situsampling; and (iii) one-pot system with an adsorbent confined in a semi-permeable barrier (dialysis tubing or filter paper barrier) withex situsampling. The sorbent systems evaluated herein include several cyclodextrin-based polyurethane materials with two types of phenolic dyes:p-nitrophenol and phenolphthalein. The one-pot kinetics method within situ(Method ii) orex situ(Method iii) sampling described herein offers significant advantages for the study of heterogeneous sorption kinetics of highly dispersed sorbent materials with particles sizes across a range of dimensions from the micron to nanometer scale. The method described herein will contribute positively to the development of advanced studies for heterogeneous sorption processes where an assessment of the relative uptake properties is required at different experimental conditions. The results of this study will be advantageous for the study of nanomaterials with significant benefits over batch kinetic studies for a wide range of heterogeneous sorption processes.
authors.affiliation: Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon S7N 5C9, Canada. mohamed.mohamed@usask.ca.
authors.forename: Mohamed H
authors.initials: MH
authors.lastname: Mohamed
authors.affiliation: Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon S7N 5C9, Canada. lee.wilson@usask.ca.
authors.forename: Lee D
authors.initials: LD
authors.lastname: Wilson
keywords: cyclodextrin; dye adsorption; kinetics; nanomaterials; p-nitrophenol; phenolphthalein; polyurethane