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Titolo:
Terminology, relative photonic efficiencies and quantum yields in heterogeneous photocatalysis. Part II: Experimental determination of quantum yields(technical report)
Autore:
Salinaro, A; Emeline, AV; Zhao, JC; Hidaka, H; Ryabchuk, VK; Serpone, N;
Indirizzi:
Concordia Univ, Dept Chem & Biochem, Montreal, PQ H3G 1M8, Canada Concordia Univ Montreal PQ Canada H3G 1M8 m, Montreal, PQ H3G 1M8, Canada Chinese Acad Sci, Inst Photog Chem, Beijing 100101, Peoples R China Chinese Acad Sci Beijing Peoples R China 100101 100101, Peoples R China Meisei Univ, Dept Chem, Tokyo 191, Japan Meisei Univ Tokyo Japan 191Meisei Univ, Dept Chem, Tokyo 191, Japan St Petersburg State Univ, Dept Phys, St Petersburg 198904, Russia St Petersburg State Univ St Petersburg Russia 198904 burg 198904, Russia
Titolo Testata:
PURE AND APPLIED CHEMISTRY
fascicolo: 2, volume: 71, anno: 1999,
pagine: 321 - 335
SICI:
0033-4545(199902)71:2<321:TRPEAQ>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
TIO2 PARTICLES; SEMICONDUCTOR; DIOXIDE; DISPERSIONS; SUSPENSIONS; OXIDATION; TITANIA; SOLS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Salinaro, A Concordia Univ, Dept Chem & Biochem, 1455 deMaisonneuve Blvd W, Montreal, PQ H3G 1M8, Canada Concordia Univ 1455 deMaisonneuve Blvd W Montreal PQ Canada H3G 1M8
Citazione:
A. Salinaro et al., "Terminology, relative photonic efficiencies and quantum yields in heterogeneous photocatalysis. Part II: Experimental determination of quantum yields(technical report)", PUR A CHEM, 71(2), 1999, pp. 321-335

Abstract

In the preceding article [Pure Appl. Chem. 71, 303-320 (1999)] we examinedtwo principal features of heterogeneous photocatalysis that demanded scrutiny: (i) description of photocatalysis and (ii) description of process efficiencies. For the latter we proposed a protocol relative photonic efficiency which could subsequently be converted to quantum yields. A difficulty in expressing a quantum yield in heterogeneous photochemistry is the very nature of the system, either solid/liquid or solid/gas, which places severe restrictions on measurement of the photon flow absorbed by the light harvesting component, herein the photocatalyst TiO2, owing to non-negligible scattering by the particulates. It was imperative therefore to examine the extent of this problem. Extinction and absorption spectra of TiO2 dispersions weredetermined at low titania loadings by normal absorption spectroscopy and by an integrated sphere method, respectively, to assess the extent of light scattering. The method is compared to the one reported by Grela et al. [J. Phys. Chem. 100, 16940 (1996)] who used a polynomial extrapolation of the light scattered in the visible region into the UV region where TiO2 absorbs significantly. This extrapolation underestimates the scattering component present in the extinction spectra, and will no doubt affect the accuracy of the quantum yield data. Further, we report additional details in assessing limiting photonic efficiencies and quantum yields in heterogeneous photocatalysis.

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Documento generato il 26/09/20 alle ore 14:45:01