Evidence on dye clustering in the sensitization of TiO<inf>2</inf> by aluminum phthalocyanine

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 TiO<inf>2</inf> modified with hydroxoaluminum- tricarboxymonoamide phthalocyanine (AlTCPc) in spite of the hi...

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Autores principales: Rodríguez, Hernán Bernardo, Litter, Marta Irene, San Roman, Enrique Arnoldo
Publicado: 2013
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1474905X_v12_n11_p1984_Rodriguez
http://hdl.handle.net/20.500.12110/paper_1474905X_v12_n11_p1984_Rodriguez
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_1474905X_v12_n11_p1984_Rodriguez2023-06-08T16:17:39Z Evidence on dye clustering in the sensitization of TiO<inf>2</inf> by aluminum phthalocyanine Rodríguez, Hernán Bernardo Litter, Marta Irene San Roman, Enrique Arnoldo 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 TiO<inf>2</inf> 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 TiO<inf>2</inf> 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 TiO<inf>2</inf> mass. Results are consistent with the presence of AlTCPc clusters with similar properties both on the TiO<inf>2</inf> surface and in H<inf>2</inf>O-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. Fil:Rodríguez, H.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Litter, M.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:San Román, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1474905X_v12_n11_p1984_Rodriguez http://hdl.handle.net/20.500.12110/paper_1474905X_v12_n11_p1984_Rodriguez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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 TiO<inf>2</inf> 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 TiO<inf>2</inf> 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 TiO<inf>2</inf> mass. Results are consistent with the presence of AlTCPc clusters with similar properties both on the TiO<inf>2</inf> surface and in H<inf>2</inf>O-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.
author Rodríguez, Hernán Bernardo
Litter, Marta Irene
San Roman, Enrique Arnoldo
spellingShingle Rodríguez, Hernán Bernardo
Litter, Marta Irene
San Roman, Enrique Arnoldo
Evidence on dye clustering in the sensitization of TiO<inf>2</inf> by aluminum phthalocyanine
author_facet Rodríguez, Hernán Bernardo
Litter, Marta Irene
San Roman, Enrique Arnoldo
author_sort Rodríguez, Hernán Bernardo
title Evidence on dye clustering in the sensitization of TiO<inf>2</inf> by aluminum phthalocyanine
title_short Evidence on dye clustering in the sensitization of TiO<inf>2</inf> by aluminum phthalocyanine
title_full Evidence on dye clustering in the sensitization of TiO<inf>2</inf> by aluminum phthalocyanine
title_fullStr Evidence on dye clustering in the sensitization of TiO<inf>2</inf> by aluminum phthalocyanine
title_full_unstemmed Evidence on dye clustering in the sensitization of TiO<inf>2</inf> by aluminum phthalocyanine
title_sort evidence on dye clustering in the sensitization of tio<inf>2</inf> by aluminum phthalocyanine
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1474905X_v12_n11_p1984_Rodriguez
http://hdl.handle.net/20.500.12110/paper_1474905X_v12_n11_p1984_Rodriguez
work_keys_str_mv AT rodriguezhernanbernardo evidenceondyeclusteringinthesensitizationoftioinf2infbyaluminumphthalocyanine
AT littermartairene evidenceondyeclusteringinthesensitizationoftioinf2infbyaluminumphthalocyanine
AT sanromanenriquearnoldo evidenceondyeclusteringinthesensitizationoftioinf2infbyaluminumphthalocyanine
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