Ion adsorption on metal oxide surfaces to hydrothermal conditions

D. J. Wesolowski, M. L. Machesky, M. K. Ridley, D. A. Palmer, Z. Zhang, P. Fenter, M. Předota, P. T. Cummings

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

In this article, we review the sorption of multivalent cations on rutile (α-TiO2) powder surfaces in aqueous 1:1 electrolyte media from room temperature to 250°C. All cations are shown to occupy 'inner sphere' sorption sites in contact with surface oxygens and hydroxyl groups, as well as the diffuse portion of the electrical double layer (EDL). Sorption is shown to increase strongly with increasing temperature, and the sorption affinity is strongly-related to cation radius and charge. Macroscopic powder pH-titration results obtained with ORNL's high temperature hydrogen electrode concentration cells can be rationalized with Gouy-Chapman-Stern models of the EDL, augmented by atomic-scale structural and proton affinity data from synchrotron X-ray studies and computational modeling approaches.

Original languageEnglish
Title of host publicationECS Transactions - Interfacial Electrochemistry and Chemistry in High Temperature Media
Pages167-180
Number of pages14
Edition27
DOIs
StatePublished - 2008
EventInterfacial Electrochemistry and Chemistry in High Temperature Media - 212th ECS Meeting - Washington, DC, United States
Duration: Oct 7 2007Oct 12 2007

Publication series

NameECS Transactions
Number27
Volume11
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

ConferenceInterfacial Electrochemistry and Chemistry in High Temperature Media - 212th ECS Meeting
CountryUnited States
CityWashington, DC
Period10/7/0710/12/07

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    Wesolowski, D. J., Machesky, M. L., Ridley, M. K., Palmer, D. A., Zhang, Z., Fenter, P., Předota, M., & Cummings, P. T. (2008). Ion adsorption on metal oxide surfaces to hydrothermal conditions. In ECS Transactions - Interfacial Electrochemistry and Chemistry in High Temperature Media (27 ed., pp. 167-180). (ECS Transactions; Vol. 11, No. 27). https://doi.org/10.1149/1.2939086