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Titolo:
On the temperature dependence of intrinsic surface protonation equilibriumconstants: An extension of the revised MUSIC model
Autore:
Machesky, ML; Wesolowski, DJ; Palmer, DA; Ridley, MK;
Indirizzi:
Illinois State Water Survey, Champaign, IL 61820 USA Illinois State Water Survey Champaign IL USA 61820 hampaign, IL 61820 USA Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA Oak Ridge Natl Lab Oak Ridge TN USA 37831 yt Sci, Oak Ridge, TN 37831 USA Texas Tech Univ, Dept Geosci, Lubbock, TX 79409 USA Texas Tech Univ Lubbock TX USA 79409 , Dept Geosci, Lubbock, TX 79409 USA
Titolo Testata:
JOURNAL OF COLLOID AND INTERFACE SCIENCE
fascicolo: 2, volume: 239, anno: 2001,
pagine: 314 - 327
SICI:
0021-9797(20010715)239:2<314:OTTDOI>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
SODIUM-CHLORIDE SOLUTIONS; RUTILE-WATER INTERFACE; METAL-OXIDE SURFACES; ION ADSORPTION; THERMODYNAMIC PROPERTIES; MOLECULAR-DYNAMICS; THEORETICAL PREDICTION; HYDROTHERMAL SOLUTIONS; SUPERCRITICAL WATER; AQUEOUS-SOLUTIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
60
Recensione:
Indirizzi per estratti:
Indirizzo: Machesky, ML Illinois State Water Survey, 2204 Griffith Dr, Champaign, IL 61820 USA Illinois State Water Survey 2204 Griffith Dr Champaign IL USA 61820
Citazione:
M.L. Machesky et al., "On the temperature dependence of intrinsic surface protonation equilibriumconstants: An extension of the revised MUSIC model", J COLL I SC, 239(2), 2001, pp. 314-327

Abstract

The revised multisite complexation (MUSIC) model of T. Hiemstra et al. (J. Colloid Interface Sci. 184, 680 (1996)) is the most thoroughly developed approach to date that explicitly considers the protonation behavior of the various types of hydroxyl groups known to exist on mineral surfaces. We haveextended their revised MUSIC model to temperatures other than 25 degreesC to help rationalize the adsorption data we have been collecting for variousmetal oxides, including rutile and magnetite to 300 degreesC. Temperature-corrected MUSIC model A constants were calculated using a consistent set ofsolution protonation reactions with equilibrium constants that are reasonably well known as a function of temperature. A critical component of this approach was to incorporate an empirical correction factor that accounts forthe observed decrease in cation hydration number with increasing temperature. This extension of the revised MUSIC model matches our experimentally determined pH of zero net proton charge pH values (pH(znpc)) for rutile to within 0.05 pH units between 25 and 250 degreesC and for magnetite within 0.2pH units between 50 and 290 degreesC. Moreover, combining the MUSIC-model-derived surface protonation constants with the basic Stern description of electrical double-layer structure results in a good fit to our experimental rutile surface protonation data for all conditions investigated (25 to 250 degreesC, and 0.03 to 1.0 m NaCl or tetramethylammonium chloride media). Consequently, this approach should be useful in other instances where it is necessary to describe and/or predict the adsorption behavior of metal oxide surfaces over a wide temperature range. (C) 2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 07:49:49