Sensitization of TiO2 with phthalocyanines: Part 1. - Photo-oxidations using hydroxoaluminium tricarboxymonoamidephthalocyanine adsorbed on TiO2

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Hydroxoaluminium tricarboxymonoamidephthalocyanine has been adsorbed on TiO2 (Degussa P-25) particles. Water suspensions and solid samples were analysed by SEM and by IR, visible extinction, diffuse reflectance and fluorescence spectroscopy. Visible spectra showed that the dye is not highly aggregat...

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Autores principales: Hodak, J., Quinteros, C., Litter, M.I., San Román, E.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09565000_v92_n24_p5081_Hodak
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_09565000_v92_n24_p5081_Hodak
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spelling todo:paper_09565000_v92_n24_p5081_Hodak2023-10-03T15:52:00Z Sensitization of TiO2 with phthalocyanines: Part 1. - Photo-oxidations using hydroxoaluminium tricarboxymonoamidephthalocyanine adsorbed on TiO2 Hodak, J. Quinteros, C. Litter, M.I. San Román, E. Hydroxoaluminium tricarboxymonoamidephthalocyanine has been adsorbed on TiO2 (Degussa P-25) particles. Water suspensions and solid samples were analysed by SEM and by IR, visible extinction, diffuse reflectance and fluorescence spectroscopy. Visible spectra showed that the dye is not highly aggregated on the surface. Fluorescence was completely quenched by the semiconductor. The sample is stable toward visible irradiation. The photocatalytic activity of the modified semiconductor for transformation of different substrates under visible irradiation in the phthalocyanine Q-band has been tested. While EDTA, oxalic acid and benzoquinone did not show any changes after irradiation, photooxidation of KI, phenol, thiophenol, 4-chlorophenol, hydroquinone and salicylic acid was observed. The analysis of the results as a function of the substrate redox potential suggests that the radical cation of the phthalocyanine, produced by electron injection of the dye into the TiO2 conduction band, is the species responsible for the oxidation of the substrates. No reaction was found, at least for phenol, when TiO2 free of AlTCPc was irradiated under the same conditions. Fil:Hodak, J. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09565000_v92_n24_p5081_Hodak
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Hydroxoaluminium tricarboxymonoamidephthalocyanine has been adsorbed on TiO2 (Degussa P-25) particles. Water suspensions and solid samples were analysed by SEM and by IR, visible extinction, diffuse reflectance and fluorescence spectroscopy. Visible spectra showed that the dye is not highly aggregated on the surface. Fluorescence was completely quenched by the semiconductor. The sample is stable toward visible irradiation. The photocatalytic activity of the modified semiconductor for transformation of different substrates under visible irradiation in the phthalocyanine Q-band has been tested. While EDTA, oxalic acid and benzoquinone did not show any changes after irradiation, photooxidation of KI, phenol, thiophenol, 4-chlorophenol, hydroquinone and salicylic acid was observed. The analysis of the results as a function of the substrate redox potential suggests that the radical cation of the phthalocyanine, produced by electron injection of the dye into the TiO2 conduction band, is the species responsible for the oxidation of the substrates. No reaction was found, at least for phenol, when TiO2 free of AlTCPc was irradiated under the same conditions.
format JOUR
author Hodak, J.
Quinteros, C.
Litter, M.I.
San Román, E.
spellingShingle Hodak, J.
Quinteros, C.
Litter, M.I.
San Román, E.
Sensitization of TiO2 with phthalocyanines: Part 1. - Photo-oxidations using hydroxoaluminium tricarboxymonoamidephthalocyanine adsorbed on TiO2
author_facet Hodak, J.
Quinteros, C.
Litter, M.I.
San Román, E.
author_sort Hodak, J.
title Sensitization of TiO2 with phthalocyanines: Part 1. - Photo-oxidations using hydroxoaluminium tricarboxymonoamidephthalocyanine adsorbed on TiO2
title_short Sensitization of TiO2 with phthalocyanines: Part 1. - Photo-oxidations using hydroxoaluminium tricarboxymonoamidephthalocyanine adsorbed on TiO2
title_full Sensitization of TiO2 with phthalocyanines: Part 1. - Photo-oxidations using hydroxoaluminium tricarboxymonoamidephthalocyanine adsorbed on TiO2
title_fullStr Sensitization of TiO2 with phthalocyanines: Part 1. - Photo-oxidations using hydroxoaluminium tricarboxymonoamidephthalocyanine adsorbed on TiO2
title_full_unstemmed Sensitization of TiO2 with phthalocyanines: Part 1. - Photo-oxidations using hydroxoaluminium tricarboxymonoamidephthalocyanine adsorbed on TiO2
title_sort sensitization of tio2 with phthalocyanines: part 1. - photo-oxidations using hydroxoaluminium tricarboxymonoamidephthalocyanine adsorbed on tio2
url http://hdl.handle.net/20.500.12110/paper_09565000_v92_n24_p5081_Hodak
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AT quinterosc sensitizationoftio2withphthalocyaninespart1photooxidationsusinghydroxoaluminiumtricarboxymonoamidephthalocyanineadsorbedontio2
AT littermi sensitizationoftio2withphthalocyaninespart1photooxidationsusinghydroxoaluminiumtricarboxymonoamidephthalocyanineadsorbedontio2
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