Artículo
Regazzoni, A.E.; Mandelbaum, P.; Matsuyoshi, M.; Schiller, S.; Bilmes, S.A.; Blesa, M.A. "Adsorption and photooxidation of salicylic acid on titanium dioxide: A surface complexation description" (1998) Langmuir. 14(4):868-874
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Abstract:
The adsorption and photooxidation of salicylic acid on dispersed TiO 2 (Degussa P-25) particles was studied as a function of substrate concentration and pH. Salicylic acid chemisorbs at the particle interface, forming inner-sphere titanium(IV) salicylate surface complexes. The visible differential diffuse reflectance spectra of the surface complexes present a band, with maximum absorption at 420 nm, which is assigned to the internal ligand to metal charge-transfer transition. The surface excess of salicylic acid increases with decreasing pH and levels off around pK a1 . At constant pH, the surface excess increases with the concentration of salicylic acid, the isotherm reflecting surface site heterogeneity. Photooxidation rates in air-saturated solutions, on the other hand, are independent of both pH and salicylic acid concentration, in the entire studied range. Chemisorption results are accounted for by a multisite surface complexation model in which two different surface titanium sites and three complexation modes are considered. The mismatch between salicylic acid surface excess values and photooxidation rates is interpreted in terms of the different reactivities of the titanium(IV) salicylate surface complexes and is attributed to the fastest hole capture by bidentate salicylate binding a single surface titanium ion. The advanced rationale illustrates the importance of the basic principles of coordination chemistry in the interpretation of apparent kinetic orders in photolyte concentration.
Registro:
| Documento: | Artículo |
| Título: | Adsorption and photooxidation of salicylic acid on titanium dioxide: A surface complexation description |
| Autor: | Regazzoni, A.E.; Mandelbaum, P.; Matsuyoshi, M.; Schiller, S.; Bilmes, S.A.; Blesa, M.A. |
| Filiación: | Unidad de Actividad Quimíca, Comn. Nac. de Ener. Atómica, Av. del Libertador 8250, 1429- Buenos Aires, Argentina INQUIMAE, Universidad de Buenos Aires, Ciudad Universitaria, 1428- Buenos Aires, Argentina |
| Palabras clave: | Adsorption; Binding energy; Chemisorption; Interfacial energy; Isotherms; pH effects; Phase transitions; Substrates; Titanium dioxide; Metal charge transfer transition; Photooxidation; Salicylic acid; Carboxylic acids |
| Año: | 1998 |
| Volumen: | 14 |
| Número: | 4 |
| Página de inicio: | 868 |
| Página de fin: | 874 |
| Título revista: | Langmuir |
| Título revista abreviado: | Langmuir |
| ISSN: | 07437463 |
| CODEN: | LANGD |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v14_n4_p868_Regazzoni |
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Citas:
---------- APA ----------
Regazzoni, A.E., Mandelbaum, P., Matsuyoshi, M., Schiller, S., Bilmes, S.A. & Blesa, M.A. (1998) . Adsorption and photooxidation of salicylic acid on titanium dioxide: A surface complexation description. Langmuir, 14(4), 868-874.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v14_n4_p868_Regazzoni [ ]
---------- CHICAGO ----------
Regazzoni, A.E., Mandelbaum, P., Matsuyoshi, M., Schiller, S., Bilmes, S.A., Blesa, M.A. "Adsorption and photooxidation of salicylic acid on titanium dioxide: A surface complexation description" . Langmuir 14, no. 4 (1998) : 868-874.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v14_n4_p868_Regazzoni [ ]
---------- MLA ----------
Regazzoni, A.E., Mandelbaum, P., Matsuyoshi, M., Schiller, S., Bilmes, S.A., Blesa, M.A. "Adsorption and photooxidation of salicylic acid on titanium dioxide: A surface complexation description" . Langmuir, vol. 14, no. 4, 1998, pp. 868-874.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v14_n4_p868_Regazzoni [ ]
---------- VANCOUVER ----------
Regazzoni, A.E., Mandelbaum, P., Matsuyoshi, M., Schiller, S., Bilmes, S.A., Blesa, M.A. Adsorption and photooxidation of salicylic acid on titanium dioxide: A surface complexation description. Langmuir. 1998;14(4):868-874.Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v14_n4_p868_Regazzoni [ ]
