Change search
ReferencesLink to record
Permanent link

Direct link
Estimation of deprotonation coefficients for chelating ion exchange resins. Comparison of different thermodynamic model
KTH, Superseded Departments, Materials Science and Engineering.
2001 (English)In: Journal of Physical Chemistry B, ISSN 1089-5647, Vol. 105, no 20, 4721-4726 p.Article in journal (Refereed) Published
Abstract [en]

The deprotonation of quinolic resin P-127 and iminodiacetic resin Amberlite IRC-718 has been studied. The process of salt transfer into the resin phase is considered to be an important contributor to the deprotonation process. Estimation of the salt transfer was based on the principle of equal activity of the salt in both phases at equilibrium. Two assumptions were made: sorbed alkali metal ions are not associated with functional groups, while all hydrogen ions are associated with functional groups. The associated hydrogen ions and functional groups do not contribute to the internal ionic strength value. Two thermodynamic models, describing the deprotonation of ion-exchange resin, were used and compared: the Gibbs-Donnan-based model of Bukata and Marinsky and the model proposed by Erik Hogfeldt. Thermodynamic characteristics of the resins' deprotonation are obtained using two different thermodynamic approaches. Hogfeldt's three-parameter model provides a better agreement with experimental data. The fitting of the data to Marinsky's method can be improved by taking into account the influence of the resins' macroporosity; however, this requires an additional empirical parameter to describe the resin.

Place, publisher, year, edition, pages
2001. Vol. 105, no 20, 4721-4726 p.
Keyword [en]
equilibria, gels
URN: urn:nbn:se:kth:diva-20659DOI: 10.1021/ja0027703ISI: 000168914600029OAI: diva2:339355
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Muhammed, Mamoun
By organisation
Materials Science and Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 19 hits
ReferencesLink to record
Permanent link

Direct link