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Potentiometric Studies of the Rutile–water Interface: Hydrogen-electrode Concentration-cell Versus Glass-electrode Titrations by Moira K. Ridley; Michael L. Machesky; Donald A. Palmer; David J. Wesolowski is a Materials Science article available to read on EtoBox.

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This paper represents a comparison of surface protonation studies of rutile in NaCl media obtained using a conventional glass-electrode autotitrator system from 10 to 50 °C, and hydrogen-electrode concentration cells from 25 to 250 °C [J. Colloid Interface Sci., 200 (1998) 298]. Experimental conditions were matched as closely as possible between the two techniques, permitting a direct comparison of the results. Values for the pH of zero net proton charge (pH znpc ) of the rutile surface obtained at 10 and 35 °C were consistent with the temperature trends observed previously using hydrogen-electrode concentration cells. The pH znpc of rutile decreases systematically from 5.7 to 4.2 as temperature increases from 10 to 250 °C. Moreover, the experimentally determined pH znpc values agree with independent estimates of the pH at the pristine point of zero charge (pH znpc ) calculated from an extension of the revised Multi-Site Complexation (MUSIC) Model of Hiemstra et al. [J. Colloid Interface Sci., 184 (1996) 680]. Surface protonation curves obtained from the glass-electrode titration results were rationalized using surface protonation constants derived from the MUSIC Model, in conjunct

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Author

Moira K. Ridley; Michael L. Machesky; Donald A. Palmer; David J. Wesolowski

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0927-7757)

Published

2002

Language

EN

Field

Materials Science (Physical Sciences)