DOI: 10.1246/bcsj.78.1595. Characteristics of Water Adsorbed on TiO2 Photocatalytic Surfaces as Studied by 1H NMR Spectroscopy

Characteristics of Water Adsorbed on TiO2 Photocatalytic Surfaces as Studied by 1H NMR Spectroscopy

10.1246/bcsj.78.1595

Crossref journal-article

Oxford University Press (OUP)

Bulletin of the Chemical Society of Japan (286)

Abstract

Abstract This account is a review of the research on the characteristics of adsorbed water molecules and the photocatalytic reaction sites of incorporated organic molecules on various TiO2 photocatalysts in powder and film forms by means of 1H NMR spectroscopy. The adsorbed water can be categorized into four distinctively different water species: i) rigid water species with restricted mobility near the solid surface; ii) less mobile water molecules in the intermediate water layer; iii) relatively mobile water molecules in the outer water layer; iv) very loosely adsorbed water molecules which exchange slowly with gaseous water molecules in air. The temperature dependence of the NMR signal of a small quantity of ethanol molecules incorporated in TiO2 suggests that the actual photocatalytic reaction site can be these adsorbed water regions. The surface conversion of hydrophilic properties of TiO2 films induced by photoirradiation is well reflected in the NMR signal change. The enhancement of water molecularly adsorbed on TiO2 films is evidently detected on UV irradiation; this phenomenon has been difficult to elucidate so far with alternative spectroscopic techniques.

Authors 2

Atsuko Y. Nosaka (first)
Yoshio Nosaka (additional)

References 99 Referenced 41

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Dates

Type	When
Created	20 years ago (Aug. 30, 2005, 1:56 a.m.)
Deposited	1 year, 7 months ago (Jan. 20, 2024, 12:41 p.m.)
Indexed	1 year, 1 month ago (July 12, 2024, 11:19 a.m.)
Issued	20 years ago (Aug. 30, 2005)
Published	20 years ago (Aug. 30, 2005)
Published Online	20 years ago (Aug. 30, 2005)
Published Print	20 years ago (Sept. 1, 2005)

Funders 0

None

BibTeX

@article{Y_Nosaka_2005, title={Characteristics of Water Adsorbed on TiO2 Photocatalytic Surfaces as Studied by 1H NMR Spectroscopy}, volume={78}, ISSN={1348-0634}, url={http://dx.doi.org/10.1246/bcsj.78.1595}, DOI={10.1246/bcsj.78.1595}, number={9}, journal={Bulletin of the Chemical Society of Japan}, publisher={Oxford University Press (OUP)}, author={Y. Nosaka, Atsuko and Nosaka, Yoshio}, year={2005}, month=aug, pages={1595–1607} }

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