Photoinduced reactivity of strongly coupled TiO2 ligands under visible irradiation: An examination of an alizarin red@TiO2 nanoparticulate system

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Similarly to alizarin molecules, 3,4-dihydroxy-9,10-dioxo-2- anthracenesulfonate (alizarin red, AR), chelates TiO2 nanoparticles through the catechol moiety, and shifts the absorption threshold of the semiconductor to the visible region. The photoinduced reactivity of the coupled system AR@TiO2 was...

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Autor principal: Di Iorio, Y.
Otros Autores: Román, E.S, Litter, M.I, Grela, M.A
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2008
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100 1 |a Di Iorio, Y. 
245 1 0 |a Photoinduced reactivity of strongly coupled TiO2 ligands under visible irradiation: An examination of an alizarin red@TiO2 nanoparticulate system 
260 |c 2008 
270 1 0 |m Grela, M. A.; Departamento de Química, Universidad Nacional de Mar del Plata, Funes 3350, B7602AYL Mar del Plata, Argentina; email: margrela@mdp.edu.ar 
506 |2 openaire  |e Política editorial 
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504 |a Using the value of the formation constant for the metal complex of Cr(VI) with alizarin red reported in Table 8.13 of Lange's Handbook of Chemistry, 14th ed, Dean, J, Ed, McGraw-Hill, Inc, New York, log K f, 4.7. we calculated that, after equilibration of this mixture, only 10% of the initial AR remains free |AR]eq ≈ 4 μM; Hodak, J., Quinteros, C., Litter, M.I., San Roman, E., (1996) J. Chem. Soc. Faraday Trans, 92, pp. 5081-5088 
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520 3 |a Similarly to alizarin molecules, 3,4-dihydroxy-9,10-dioxo-2- anthracenesulfonate (alizarin red, AR), chelates TiO2 nanoparticles through the catechol moiety, and shifts the absorption threshold of the semiconductor to the visible region. The photoinduced reactivity of the coupled system AR@TiO2 was investigated through quantum yields determinations in nonscattering sols of TiO2 modified nanoparticles. In contrast with the behavior observed in TiO2 microparticulated systems, the chemisorbed ligand has a high stability under aerated visible light irradiation. The quantum yield for alizarin red oxidation Φ-AR = 4 × 10-4 correlates with the negligible efficiency for oxygen reduction in the constrained environment of the smaller particles, Conversely, reduction of Cr(VI) to Cr(V) in the coupled AR@TiO2 system, confirmed by electron paramagnetic resonance spectroscopy, utilizes a high fraction of the photogenerated electrons and induces the degradation of the complex. Quantum efficiencies for chromium(VI) disappearance, Φ-cr(v1). approaches 37% at [Cr(VI)]0 = 200 μM. The interactions between Cr(VI)/AR and Cr(VI)/TiO2 are analyzed in detail. Spectroscopic evidence is presented for the first time that Cr(VI) forms a charge-transfer complex with TiO2 nanoparticles that could be excited by visible light (λ < 440 nm). The environmental implications of the above findings are briefly discussed. © 2008 American Chemical Society.  |l eng 
593 |a Departamento de Química, Universidad Nacional de Mar del Plata, Funes 3350, B7602AYL Mar del Plata, Argentina 
593 |a INQUIMAE, Facultad de Ciencias Exactas y Naturales, Pahellón 2, 1428 Buenos Aires, Argentina 
593 |a Gerencia Química, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, 1650 San Martín, Prov. de Buenos Aires, Argentina 
593 |a Scuela de Posgrado, Universidad de Gral, San Martín, Peatonal Belgrano 3563, 1er. piso, 1650 San Martín, Prov. de Buenos Aires, Argentina 
650 1 7 |2 spines  |a ARGON 
690 1 0 |a CHEMISORPTION 
690 1 0 |a CHROMIUM 
690 1 0 |a COLLOIDS 
690 1 0 |a ELECTROLYTIC REDUCTION 
690 1 0 |a ELECTRON SPIN RESONANCE SPECTROSCOPY 
690 1 0 |a IRRADIATION 
690 1 0 |a LIGANDS 
690 1 0 |a NANOPARTICLES 
690 1 0 |a NANOSTRUCTURED MATERIALS 
690 1 0 |a NANOSTRUCTURES 
690 1 0 |a OXYGEN 
690 1 0 |a PARAMAGNETIC RESONANCE 
690 1 0 |a PARAMAGNETISM 
690 1 0 |a PHOTODEGRADATION 
690 1 0 |a QUANTUM EFFICIENCY 
690 1 0 |a SYSTEM STABILITY 
690 1 0 |a VEGETATION 
690 1 0 |a CONSTRAINED ENVIRONMENTS 
690 1 0 |a COUPLED SYSTEMS 
690 1 0 |a ELECTRON PARAMAGNETIC RESONANCE SPECTROSCOPIES 
690 1 0 |a ENVIRONMENTAL IMPLICATIONS 
690 1 0 |a HIGH STABILITIES 
690 1 0 |a NANOPARTICULATE SYSTEMS 
690 1 0 |a OXYGEN REDUCTIONS 
690 1 0 |a PHOTO INDUCED 
690 1 0 |a PHOTOGENERATED ELECTRONS 
690 1 0 |a SEMI-CONDUCTORS 
690 1 0 |a SPECTROSCOPIC EVIDENCES 
690 1 0 |a VISIBLE IRRADIATIONS 
690 1 0 |a VISIBLE LIGHTS 
690 1 0 |a VISIBLE REGIONS 
690 1 0 |a CHROMIUM COMPOUNDS 
700 1 |a Román, E.S. 
700 1 |a Litter, M.I. 
700 1 |a Grela, M.A. 
773 0 |d 2008  |g v. 112  |h pp. 16532-16538  |k n. 42  |p J. Phys. Chem. C  |x 19327447  |t Journal of Physical Chemistry C 
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856 4 0 |u https://doi.org/10.1021/jp8040742  |y DOI 
856 4 0 |u https://hdl.handle.net/20.500.12110/paper_19327447_v112_n42_p16532_DiIorio  |y Handle 
856 4 0 |u https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19327447_v112_n42_p16532_DiIorio  |y Registro en la Biblioteca Digital 
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