NDLI: Adsorption of Ions on Zirconium Oxide Surfaces from Aqueous Solutions at High Temperatures

Content Provider	Springer Nature Link
Author	Palmer, D. A. Machesky, M. L. Bénézeth, P. Wesolowski, D. J. Avitz, L. M. Deshon, J. C.
Copyright Year	2009
Abstract	Surface titrations were carried out on suspensions of monoclinic ZrO$_{2}$ from 25 to 290 °C slightly above saturation vapor pressure at ionic strengths of 0.03, 0.1 and 1.0 mol⋅kg$^{−1}$(NaCl). A typical increase in surface charge was observed with increasing temperature. There was no correlation between the radius of the cations, Li$^{+}$, Na$^{+}$, K$^{+}$ and (CH$_{3}$)$_{4}$N$^{+}$, and the magnitude of their association with the surface. The combined results were treated with a 1-pK$_{a}$ MUSIC model, which yielded association constants for the cations (and chloride ion at low pH) at each temperature. The pH of zero-point-charge, pH$_{zpc}$, decreased with increasing temperature as found for other metal oxides, reaching an apparent minimum value of 4.1 by 250 °C. Batch experiments were performed to monitor the concentration of LiOH in solutions containing suspended ZrO$_{2}$ particles from 200 to 360 °C. At 350 and 360 °C, Li$^{+}$ and OH$^{−}$ ions were almost totally adsorbed when the pressure was lowered to near saturation vapor pressure. This reversible trend has implications not only to pressure-water reactor, PWR, operations, but is also of general scientific and other applied interest. Additional experiments probed the feasibility that boric acid/borate ions adsorb reversibly onto ZrO$_{2}$ surfaces at near-neutral pH conditions as indicated in earlier publications.
Starting Page	907
Ending Page	924
Page Count	18
File Format	PDF
ISSN	00959782
Journal	Journal of Solution Chemistry
Volume Number	38
Issue Number	7
e-ISSN	15728927
Language	English
Publisher	Springer US
Publisher Date	2009-05-05
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Zirconium oxide Adsorption Potentiometry Batch experiments High temperature Lithium ions Borate anions MUSIC model PWR applications Condensed Matter Inorganic Chemistry Oceanography Geochemistry Industrial Chemistry/Chemical Engineering Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Biochemistry Molecular Biology Biophysics Physical and Theoretical Chemistry

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