Isotope studies of photocatalysis

Oh, Youn-Chul; Bao, Youmei; Jenks, William S.

doi:10.1016/s1010-6030(03)00272-7

Cited by 30 publications

(9 citation statements)

References 29 publications

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“…These include chemical structure, crystallinity, size, and the adsorption properties of the pollutants on the catalyst substrate. [14,50,51] The observed changes in the XPS spectra are consistent with the observed changes in the infrared spectra upon nitrogen incorporation. The observed XPS peaks for the Ti 2p region and their change with nitrogen incorporation are quite consistent with the recent XPS depth profiling characterization of Gyorgy et al [42] These authors have also observed a shift in the Ti 2p binding energy to lower energies as a TiO 2 surface is nitrided.…”

Section: Discussionsupporting

confidence: 72%

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Formation of Oxynitride as the Photocatalytic Enhancing Site in Nitrogen‐Doped Titania Nanocatalysts: Comparison to a Commercial Nanopowder

Chen

Lou

Samia

et al. 2005

Adv Funct Materials

416

355

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A nitrogen‐doped TiO2 nanocolloid has been successfully prepared and its properties compared with the commercially available TiO2 nanomaterial, Degussa P25. Several characterization techniques, X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), transmission electron spectroscopy (TEM), Fourier transform infrared (FT‐IR) spectroscopy, Raman scattering, and UV‐visible reflectance spectra, are combined in order to determine the crystal phase and grain size, shape, degree of nitrogen incorporation, and nature of the resultant oxynitride chemical bonding on the surface and in the bulk. The high relative photocatalytic activity of the nitrogen doped‐TiO2 nanocolloid is evaluated through a study of the decomposition of methylene blue under visible light excitation. The ease and degree of substitutional‐insertional nitrogen doping is held accountable for the significant increase in photocatalytic activity in the porous nanocolloid versus the nitrided commercial nanopowder. It is suggested that the nitrogen incorporation produces an NO bonding region as evidenced by the resulting XPS spectrum.

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Section: Discussionsupporting

confidence: 72%

“…[8,10,12,14,50,51] . These transient species as well as holes break down the methylene blue to smaller fragments that eventually completely decompose into simple inorganic minerals.…”

Section: Discussionmentioning

confidence: 99%

Formation of Oxynitride as the Photocatalytic Enhancing Site in Nitrogen‐Doped Titania Nanocatalysts: Comparison to a Commercial Nanopowder

Chen

Lou

Samia

et al. 2005

Adv Funct Materials

416

355

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“…isotopic effects close to unity have been experimentally determined and theoretically predicted for • OHaq/ • ODaq [32][33][34] The difference in kinetic solvent isotope effect observed in this study (approx 1.5) suggests that the interaction of the solvent with the photocatalyst and the rate of oxidation of the solvent is probably the rate determining step for the process rather that the rate of oxygen reduction as previously suggested by Gerischer [35] Previously there have been reports of isotope studies on photocatalytic processes using isotopically labelled substrates rather than studies of the solvent isotope effect [36,37]. To the best of our knowledge, no other workers have investigated the kinetic solvent isotope effect with their particular photocatalytic systems.…”

Section: Photocatalysissupporting

confidence: 68%

A study of the kinetic solvent isotope effect on the destruction of microcystin-LR and geosmin using TiO2 photocatalysis

Robertson

Bahnemann

Lawton

et al. 2011

Applied Catalysis B: Environmental

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“…One of the general conclusions from studies on the photooxidation of organophosphorus compounds on TiO 2 is that the oxidized phosphorus product (usually a phosphate) tends to poison the surface during gas phase reactions [719,[1053][1054][1055][1056], but does not in buffered solution phase settings [1057][1058][1059]. This simple observation suggests that adsorbed phosphates can be hydrated and removed from the surface into solution.…”

Section: Phosphorous-and Sulfur-containing Moleculesmentioning

confidence: 99%

A surface science perspective on TiO2 photocatalysis

Henderson

2011

Surface Science Reports

1,857

1,634

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a b s t r a c tThe field of surface science provides a unique approach to understanding bulk, surface and interfacial phenomena occurring during TiO 2 photocatalysis. This review highlights, from a surface science perspective, recent literature that provides molecular-level insights into photon-initiated events occurring at TiO 2 surfaces. Seven key scientific issues are identified in the organization of this review. These are: (1) photon absorption, (2) charge transport and trapping, (3) electron transfer dynamics, (4) the adsorbed state, (5) mechanisms, (6) poisons and promoters, and (7) phase and form. This review ends with a brief examination of several chemical processes (such as water splitting) in which TiO 2 photocatalysis has made significant contributions in the literature.

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Isotope studies of photocatalysis

Cited by 30 publications

References 29 publications

Formation of Oxynitride as the Photocatalytic Enhancing Site in Nitrogen‐Doped Titania Nanocatalysts: Comparison to a Commercial Nanopowder

Formation of Oxynitride as the Photocatalytic Enhancing Site in Nitrogen‐Doped Titania Nanocatalysts: Comparison to a Commercial Nanopowder

A study of the kinetic solvent isotope effect on the destruction of microcystin-LR and geosmin using TiO2 photocatalysis

A surface science perspective on TiO2 photocatalysis

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