Artículo

Eggleston, C.M.; Hug, S.; Stumm, W.; Sulzberger, B.; Afonso, M.D.S. "Surface complexation of sulfate by hematite surfaces: FTIR and STM observations" (1998) Geochimica et Cosmochimica Acta. 62(4):585-593
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Abstract:

Sulfate adsorbed to hematite surfaces from aqueous solution is examined using Fourier transform infrared (FTIR) spectroscopy and scanning tunneling microscopy (STM). FTIR was carried out using an Attenuated Total Reflectance (ATR) element coated with a fixed layer of hematite particles; this configuration allowed in situ variation of pH and sulfate concentration. The FTIR results are consistent with an inner-sphere monodentate surface complex. On dried samples, sulfate may form bidentate or possibly monodentate bisulfate complexes. STM was applied to samples that were removed from solution and imaged in air, conditions corresponding to those of the dried samples in FTIR. The images show mobile adsorbates whose lifetimes were greater than 5 ms and less than 240 ms, times that bracket the average lifetimes of aqueous FeSO+ 4 complexes (∼50 ms). In addition, the images show pairs of bumps, in agreement with STM images of bisulfate adsorbed on Pt(111) electrode surfaces (Funtikov et al., 1995). Although the STM images do not provide chemical identification, they are consistent with imaging of adsorbed inner-sphere sulfate (STM is incapable of seeing outer-sphere adsorbates). Our results suggest that categorization of adsorbates into inner-sphere and outer-sphere on the basis of macroscopic adsorption information is perhaps oversimplistic. Instead, a spectrum of intermediate behaviors is likely. Adsorbates classed (macroscopically) as outer-sphere may be those for which a relatively small proportion of adsorbates are in inner-sphere complexes at any given time. Copyright © 1998 Elsevier Science Ltd.

Registro:

Documento: Artículo
Título:Surface complexation of sulfate by hematite surfaces: FTIR and STM observations
Autor:Eggleston, C.M.; Hug, S.; Stumm, W.; Sulzberger, B.; Afonso, M.D.S.
Filiación:Department of Geology and Geophysics, University of Wyoming, Laramie, WY 82071-3006, United States
Fed. Inst. Environ. Sci. Technol., Swiss Fed. Institutes of Technology, CH-8600 Dübendorf, Switzerland
Departamento de Quimica Inorganica, Analitica y Quimica Fisica, Ciudad Universitaria Pabellon II, 1428 Buenos Aires, Argentina
Palabras clave:adsorption; FTIR; haematite; STM; sulphate
Año:1998
Volumen:62
Número:4
Página de inicio:585
Página de fin:593
DOI: http://dx.doi.org/10.1016/S0016-7037(97)00372-4
Título revista:Geochimica et Cosmochimica Acta
Título revista abreviado:Geochim. Cosmochim. Acta
ISSN:00167037
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167037_v62_n4_p585_Eggleston

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Citas:

---------- APA ----------
Eggleston, C.M., Hug, S., Stumm, W., Sulzberger, B. & Afonso, M.D.S. (1998) . Surface complexation of sulfate by hematite surfaces: FTIR and STM observations. Geochimica et Cosmochimica Acta, 62(4), 585-593.
http://dx.doi.org/10.1016/S0016-7037(97)00372-4
---------- CHICAGO ----------
Eggleston, C.M., Hug, S., Stumm, W., Sulzberger, B., Afonso, M.D.S. "Surface complexation of sulfate by hematite surfaces: FTIR and STM observations" . Geochimica et Cosmochimica Acta 62, no. 4 (1998) : 585-593.
http://dx.doi.org/10.1016/S0016-7037(97)00372-4
---------- MLA ----------
Eggleston, C.M., Hug, S., Stumm, W., Sulzberger, B., Afonso, M.D.S. "Surface complexation of sulfate by hematite surfaces: FTIR and STM observations" . Geochimica et Cosmochimica Acta, vol. 62, no. 4, 1998, pp. 585-593.
http://dx.doi.org/10.1016/S0016-7037(97)00372-4
---------- VANCOUVER ----------
Eggleston, C.M., Hug, S., Stumm, W., Sulzberger, B., Afonso, M.D.S. Surface complexation of sulfate by hematite surfaces: FTIR and STM observations. Geochim. Cosmochim. Acta. 1998;62(4):585-593.
http://dx.doi.org/10.1016/S0016-7037(97)00372-4