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Titolo:
Ru(bpy)(3)(2+)/TiO2-codoped zeolites: Synthesis, characterization, and therole of TiO2 in electron transfer photocatalysis
Autore:
Bossmann, SH; Turro, C; Schnabel, C; Pokhrel, MR; Payawan, LM; Baumeister, B; Worner, M;
Indirizzi:
Univ Karlsruhe, Lehrstuhl Umweltmesstech, D-76128 Karlsruhe, Germany Univ Karlsruhe Karlsruhe Germany D-76128 ech, D-76128 Karlsruhe, Germany Ohio State Univ, Dept Chem, Columbus, OH 43210 USA Ohio State Univ Columbus OH USA 43210 , Dept Chem, Columbus, OH 43210 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 23, volume: 105, anno: 2001,
pagine: 5374 - 5382
SICI:
1520-6106(20010614)105:23<5374:RZSCAT>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
MODIFIED TITANIUM-DIOXIDE; ENVIRONMENTAL PHOTOCHEMISTRY; SPECTROSCOPIC PROPERTIES; POLYPYRIDINE COMPLEXES; WATER-TREATMENT; VISIBLE-LIGHT; Y-ZEOLITE; PHOTOPHYSICAL CHARACTERIZATION; INTRAZEOLITE PHOTOCHEMISTRY; ENHANCED PHOTODEGRADATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
84
Recensione:
Indirizzi per estratti:
Indirizzo: Bossmann, SH Univ Karlsruhe, Lehrstuhl Umweltmesstech, Kaiserstr 12, D-76128 Karlsruhe,Germany Univ Karlsruhe Kaiserstr 12 Karlsruhe Germany D-76128ermany
Citazione:
S.H. Bossmann et al., "Ru(bpy)(3)(2+)/TiO2-codoped zeolites: Synthesis, characterization, and therole of TiO2 in electron transfer photocatalysis", J PHYS CH B, 105(23), 2001, pp. 5374-5382

Abstract

Novel heterogeneous photocatalysts were developed which are able to transfer electrons from excited Ru(II) donors within the zeolite framework to Co(III) acceptor complexes in the exterior. The materials were prepared and characterized by elemental analysis, electrochemical methods, diffuse reflectance, and raster and transmission electron microscopy. The catalysts consist of zeolite Y-encapsulated Ru(bpy)(3)(2+) (bpy = 2,2 ' -bipyridine) sensitizers in close proximity to TiO2 nanoparticles on the same support. The photophysical properties of Ru(bpy)(3)(2+) within the zeolite supercages were investigated at different loadings of Ru(bpy)(3)(2+) and TiO2. The photoexcited MLCT state of the zeolite-entrapped Ru(bpy)(3)(2+) reacts via electrontransfer with Co(dpphen)(3)(3+) (dpphen = 4,7-diphenyl-1,10-phenanthroline) in the exterior of the zeolite particles. The relative quenching of Ru(bpy)(3)(2+) by external Co(dpphen)(3)(3+) increases as the TiO2 content within the zeolite is increased, where electron transfer from Ru(bpy)32+ complexes within the interior of the zeolite are able to transfer electrons to Co(dpphen)(3)(3+). This observation indicates that electrons can be transported from the interior of the zeolite to the surface in the presence of an appropriate electron relay, such as TiO2 nanoparticles.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/10/20 alle ore 05:33:43