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Determination of the ion exchange process of K2Ti4O9 fibers at constant pH and modeling with statistical rate theory
Nanjing University of Technology, College of Chemistry and Chemical Engineering, Nanjing University of Technology, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology.
School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman.
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2015 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 5, no 90, p. 73474-73480Article in journal (Refereed) Published
Abstract [en]

The ion exchange kinetics of K2Ti4O9 fibers at constant pH was determined precisely by ion-selective electrodes, and activity coefficients of ions in solutions were calculated by the Lu-Maurer equation. It was found that the equilibrium time and TiO2/K2O molar ratio in the solid phase are more sensitive to pH than to water volume. After that, a two-step exchange kinetics model was developed, in which a statistical rate theory base on chemical potential difference between interface was use to describe surface reaction process instead of an empirical exponential equation. The model shows that the resistance of the surface reaction step, which includes hydration of K+ ions on the surface and their transport in the solid phase, is the main resistance of the ion exchange process.

Place, publisher, year, edition, pages
2015. Vol. 5, no 90, p. 73474-73480
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-10547DOI: 10.1039/c5ra11882dISI: 000360860500019Scopus ID: 2-s2.0-84940987684Local ID: 95e2f78c-0966-47df-ab6b-2bcb459c29e0OAI: oai:DiVA.org:ltu-10547DiVA, id: diva2:983492
Note
Validerad; 2015; Nivå 2; 20151009 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Wu, Nanhua

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