Artículo

Rodríguez, H.B.; Di Iorio, Y.; Meichtry, J.M.; Grela, M.A.; Litter, M.I.; San Román, E. "Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine" (2013) Photochemical and Photobiological Sciences. 12(11):1984-1990
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Abstract:

As previous studies have shown, the photocatalytic reduction of Cr(vi) to Cr(iii) in the presence of 4-chlorophenol can be carried out efficiently under visible irradiation using TiO2 modified with hydroxoaluminum- tricarboxymonoamide phthalocyanine (AlTCPc) in spite of the high aggregation tendency of the dye. In the present work, photocurrent and absorption spectra of AlTCPc modified TiO2 films are studied together with absorption and fluorescence of the dye in solution as a function of the concentration of the dye to clarify (a) the role of aggregates and the nature of the species responsible for electron injection into the semiconductor and (b) the reasons why, as reported earlier, the photocatalytic activity is nearly independent of dye loading at constant TiO2 mass. Results are consistent with the presence of AlTCPc clusters with similar properties both on the TiO2 surface and in H2O-DMSO solution. The actual photoactive species is the monomeric dye electronically coupled to the semiconductor. Monomer concentration depends only slightly on AlTCPc analytical concentration, in a way similar to surfactant monomers in micellar equilibrium, thus explaining the independence of photocatalytic activity on dye concentration. © The Royal Society of Chemistry and Owner Societies.

Registro:

Documento: Artículo
Título:Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine
Autor:Rodríguez, H.B.; Di Iorio, Y.; Meichtry, J.M.; Grela, M.A.; Litter, M.I.; San Román, E.
Filiación:INQUIMAE (UBA-CONICET), Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón 2, 1428 Ciudad de Buenos Aires, Argentina
Departamento de Química, Universidad Nacional de Mar Del Plata, Funes 3350, 7600 Mar del Plata Prov. de Buenos Aires, Argentina
Gerencia Química, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499 1650, San Martín Prov. de Buenos Aires, Argentina
Instituto de Investigación e Ingeniería Ambiental, Universidad de Gral. San Martín, Peatonal Belgrano 3563 1er. piso, 1650 San Martín Prov. de Buenos Aires, Argentina
INIFTA, Facultad de Ciencias Exactas, Universidad Nacional de la Plata, Diag. 113 y Calle 64, 1900 La Plata, Prov. de Buenos Aires, Argentina
INTEMA-CONICET, Facultad de Ingenieria, Universidad Nacional de Mar Del Plata, Juan B. Justo 4302, 7600 Mar del Plata, Prov. de Buenos Aires, Argentina
Año:2013
Volumen:12
Número:11
Página de inicio:1984
Página de fin:1990
DOI: http://dx.doi.org/10.1039/c3pp50191d
Título revista:Photochemical and Photobiological Sciences
Título revista abreviado:Photochem. Photobiol. Sci.
ISSN:1474905X
CODEN:PPSHC
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1474905X_v12_n11_p1984_Rodriguez

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Citas:

---------- APA ----------
Rodríguez, H.B., Di Iorio, Y., Meichtry, J.M., Grela, M.A., Litter, M.I. & San Román, E. (2013) . Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine. Photochemical and Photobiological Sciences, 12(11), 1984-1990.
http://dx.doi.org/10.1039/c3pp50191d
---------- CHICAGO ----------
Rodríguez, H.B., Di Iorio, Y., Meichtry, J.M., Grela, M.A., Litter, M.I., San Román, E. "Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine" . Photochemical and Photobiological Sciences 12, no. 11 (2013) : 1984-1990.
http://dx.doi.org/10.1039/c3pp50191d
---------- MLA ----------
Rodríguez, H.B., Di Iorio, Y., Meichtry, J.M., Grela, M.A., Litter, M.I., San Román, E. "Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine" . Photochemical and Photobiological Sciences, vol. 12, no. 11, 2013, pp. 1984-1990.
http://dx.doi.org/10.1039/c3pp50191d
---------- VANCOUVER ----------
Rodríguez, H.B., Di Iorio, Y., Meichtry, J.M., Grela, M.A., Litter, M.I., San Román, E. Evidence on dye clustering in the sensitization of TiO2 by aluminum phthalocyanine. Photochem. Photobiol. Sci. 2013;12(11):1984-1990.
http://dx.doi.org/10.1039/c3pp50191d