Palladium catalysis of O2 reduction by electrons accumulated on TiO2 particles during photoassisted oxidation of organic compounds

Wang, Chong Mou; Heller, Adam; Gerischer, H.

doi:10.1021/ja00039a039

Cited by 325 publications

(215 citation statements)

References 1 publication

(1 reference statement)

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“…[40,41] Current (I)-potential (E) curves were measured for the mesopoporous TiO 2 nanocrystalline film-coated fluorine-tin oxide (FTO) (mp-TiO 2 / FTO) electrodes in an aerated 0.1 M NaClO 4 aqueous solution in the dark. Fig.…”

Section: Electron Transfer To Molecular Oxygenmentioning

confidence: 99%

Molecular Metal Oxide Cluster-Surface Modified Titanium(IV) Dioxide Photocatalysts

Nolan¹,

Iwaszuk²,

Tada³

2012

Aust. J. Chem.

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The surface modification of TiO 2 with molecular sized metal oxide clusters has recently been shown to be a promising approach for providing TiO 2 with visible-light activity and/or improved UV activity. This short review summarizes the effects of the surface modification of TiO 2 with the oxides of iron and tin selected from d-and p-blocks, respectively, on the photocatalytic activity. Fe(acac) 3 and [Sn(acac) 2 ]Cl 2 chemisorption on the TiO 2 surface occurs by ligand-exchange and ion-exchange, respectively. Taking advantage of the strong adsorption, we formed extremely small metal oxide clusters on TiO 2 by the chemisorption-calcination cycle (CCC) technique with their loading amount strictly controlled. The iron oxide surface modification of P-25 (anatase/rutile ¼ 4 : 1, w/w, Degussa) gives rise to a high level of visible-light activity and a concomitant increase in the UV-light activity for the degradation of model organic pollutants. On the other hand, only the UV-light activity is increased by the tin oxide surface modification of ST-01 (anatase, Ishihara Sangyo). This striking difference can be rationalized on the basis of the material characterization and DFT calculations, which show that FeO x surface modification of rutile leads to visible-light activity, while SnO 2 -modified anatase enhances only the UV-light activity. We propose the mechanisms behind the FeO x and SnO 2 surface modification, where the surface-to-bulk and bulk-to-surface interfacial electron transfer are taken into account in the former and the latter, respectively.

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Section: Electron Transfer To Molecular Oxygenmentioning

confidence: 99%

Molecular Metal Oxide Cluster-Surface Modified Titanium(IV) Dioxide Photocatalysts

Nolan¹,

Iwaszuk²,

Tada³

2012

Aust. J. Chem.

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“…[1][2][3][4][5] The main drawbacks of low quantum yields and the lack of visible light utilization, however, hinder its practical application. To handle these problems, numerous studies have recently been performed to enhance the photocatalytic efficiency and visible light utilization of TiO 2 , which include impurity doping, [6][7][8][9] metallization, [10][11][12][13][14][15] and sensitization. 16,17 According to these published works, the deposition of the metal on visible light catalysts highly improved its photoefficiency through the Schottky barrier CB electron trapping and consequent longer electron-hole pair lifetimes.…”

Section: Introductionmentioning

confidence: 99%

Ag/AgBr/TiO₂ Visible Light Photocatalyst for Destruction of Azodyes and Bacteria

et al. 2006

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was prepared by the deposition-precipitation method and was found to be a novel visible light driven photocatalyst. The catalyst showed high efficiency for the degradation of nonbiodegradable azodyes and the killing of Escherichia coli under visible light irradiation (λ > 420 nm). The catalyst activity was maintained effectively after successive cyclic experiments under UV or visible light irradiation without the destruction of AgBr. On the basis of the characterization of X-ray diffraction, X-ray photoelectron spectroscopy, and Auger electron spectroscopy, the surface Ag species mainly exist as Ag 0 in the structure of all samples before and after reaction, and Ag 0 species scavenged h VB + and then trapped e CB -in the process of photocatalytic reaction, inhibiting the decomposition of AgBr. The studies of ESR and H 2 O 2 formation revealed that • OH and O 2•-were formed in visible light irradiated aqueous Ag/AgBr/TiO 2 suspension, while there was no reactive oxygen species in the visible light irradiated Ag 0 /TiO 2 system. The results indicate that AgBr is the main photoactive species for the destruction of azodyes and bacteria under visible light. In addition, the bactericidal efficiency and killing mechanism of Ag/AgBr/TiO 2 under visible light irradiation are illustrated and discussed.

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“…Many researchers [19,26] suggested that electron transfer to oxygen might be the rate-limiting step in photocatalytic reaction, and Cu 2 O can accelerate this step. According to many studies [18,27], light irradiated Cu 2 O could absorb large numbers of oxygen in bulk and possess very strong ability to reduce O 2 .…”

Section: Photocatalytic Degradation Of Mbmentioning

confidence: 99%

Preparation of nano-Cu2O/TiO2 photocatalyst from waste printed circuit boards by electrokinetic process

Xiu

Zhang

2009

Journal of Hazardous Materials

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Palladium catalysis of O2 reduction by electrons accumulated on TiO2 particles during photoassisted oxidation of organic compounds

Cited by 325 publications

References 1 publication

Molecular Metal Oxide Cluster-Surface Modified Titanium(IV) Dioxide Photocatalysts

Molecular Metal Oxide Cluster-Surface Modified Titanium(IV) Dioxide Photocatalysts

Ag/AgBr/TiO₂ Visible Light Photocatalyst for Destruction of Azodyes and Bacteria

Preparation of nano-Cu2O/TiO2 photocatalyst from waste printed circuit boards by electrokinetic process

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Palladium catalysis of O2 reduction by electrons accumulated on TiO2 particles during photoassisted oxidation of organic compounds

Cited by 325 publications

References 1 publication

Molecular Metal Oxide Cluster-Surface Modified Titanium(IV) Dioxide Photocatalysts

Molecular Metal Oxide Cluster-Surface Modified Titanium(IV) Dioxide Photocatalysts

Ag/AgBr/TiO2 Visible Light Photocatalyst for Destruction of Azodyes and Bacteria

Preparation of nano-Cu2O/TiO2 photocatalyst from waste printed circuit boards by electrokinetic process

Contact Info

Product

Resources

About

Ag/AgBr/TiO₂ Visible Light Photocatalyst for Destruction of Azodyes and Bacteria