An examination of isotherm generation : impact of bottle-point method upon potassium ion exchange with strong acid cation resin

Millar, Graeme J., Couperthwaite, Sara J., & Leung, Chun Wing (2015) An examination of isotherm generation : impact of bottle-point method upon potassium ion exchange with strong acid cation resin. Separation and Purification Technology, 141, pp. 366-377.

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Abstract

This paper relates to the importance of impact of the chosen bottle-point method when conducting ion exchange equilibria experiments. As an illustration, potassium ion exchange with strong acid cation resin was investigated due to its relevance to the treatment of various industrial effluents and groundwater. The “constant mass” bottle-point method was shown to be problematic in that depending upon the resin mass used the equilibrium isotherm profiles were different. Indeed, application of common equilibrium isotherm models revealed that the optimal fit could be with either the Freundlich or Temkin equations, depending upon the conditions employed. It could be inferred that the resin surface was heterogeneous in character, but precise conclusions regarding the variation in the heat of sorption were not possible. Estimation of the maximum potassium loading was also inconsistent when employing the “constant mass” method. The “constant concentration” bottle-point method illustrated that the Freundlich model was a good representation of the exchange process. The isotherms recorded were relatively consistent when compared to the “constant mass” approach. Unification of all the equilibrium isotherm data acquired was achieved by use of the Langmuir Vageler expression. The maximum loading of potassium ions was predicted to be at least 116.5 g/kg resin.

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ID Code: 81970
Item Type: Journal Article
Refereed: Yes
Keywords: potassium, strong acid cation, resin, equilibrium, bottle-point
DOI: 10.1016/j.seppur.2014.12.024
ISSN: 1383-5866
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Solution Chemistry (030605)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Elsevier B.V.
Copyright Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Separation and Purification Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Separation and Purification Technology, Volume 141, (12 February 2015), DOI: 10.1016/j.seppur.2014.12.024
Deposited On: 22 Feb 2015 23:32
Last Modified: 02 Mar 2015 17:47

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