Showing papers on "Photocatalysis published in 1979"
TL;DR: In this article, a spin trap was used to detect free-radical intermediates formed during in situ irradiation of TiO/sub 2/ and platinized polysilicon powders in aqueous solution.
Abstract: Spin trapping and ESR detection (with the traps ..cap alpha..-phenyl N-tert-butyl nitrone and ..cap alpha..-(4-pyridyl N-oxide) N-tert-butyl nitrone) were employed to detect free-radical intermediates formed during in situ irradiation of TiO/sub 2/ and platinized TiO/sub 2/ powders in aqueous solutions. Evidence for the production of hydroxyl radical (.OH) (formed in the oxidation of water) and perhydroxyl radical (HO/sub 2/.) (probably formed in a reduction step) is presented. Other spin adducts, attributed to decomposition reactions of the spin traps, were also found. The results suggest an important role for photogenerated .OH in many photocatalytic and photosynthetic processes at TiO/sub 2/ powders.
533 citations
105 citations
TL;DR: In this article, the electrical photoconductivity σ of TiO2 and the photocatalytic activity for isobutane oxidation at room temperature over this catalyst have been simultaneously measured.
76 citations
TL;DR: In this article, the photocatalyzed reaction of hydroquinone with oxygen at TiO2 (anatase) powders coated with metal-free or magnesium phthalocyanine under irradiation with light of energy less than the TiO 2 band gap is described.
Abstract: : The photocatalyzed reaction of hydroquinone with oxygen at TiO2 (anatase) powders coated with metal-free or magnesium phthalocyanine under irradiation with light of energy less than the TiO2 band gap is described. The behavior at the powders is correlated with current-potential curves at single crystal n-type TiO2 electrode and an energy level scheme for the reaction is proposed. (Author)
71 citations
31 citations
TL;DR: Gaseous H2, CO, and CO2 were produced from water and carbon by photocatalytic processes using TiO2-RuO2 as a catalyst.
Abstract: Gaseous H2, CO, and CO2 were produced from water and carbon by photocatalytic processes using TiO2–RuO2 as a catalyst.
28 citations
TL;DR: In this paper, the Wagner-Traud mechanism prevails in the photocatalytic oxidation of methanol and 2-propanol by oxygen on illuminated rutile catalysts.
17 citations
4 citations
TL;DR: In this paper, the photocatalytic activity is determined by the density of 2p states close to the top of the valence band, and the 2p state density is a function of the intrinsic rutile adsorption.
Abstract: In the region of intrinsic rutile adsorption, CO oxidation follows a redox mechanism via the interaction of CO with O− ion-radicals, and the photocatalytic activity is determined by the density of 2p states close to the top of the valence band.
1 citations
01 Jan 1979
TL;DR: In this article, a reversible excited-state electron-transfer reaction is demonstrated in photogalvanic cells and photocatalysis, and the authors show that the reaction is reversible.
Abstract: Systems exhibiting reversible excited-state electron-transfer reactions are currently of great interest because of their utilization in photogalvanic cells and photocatalysis.
TL;DR: When copper triflate·cis-cycloheptene is irradiated at 254 nm in n−hexane solution, cis → trans-isomerization occurs and the stable complex copper (I) triflated·transcyclohexene precipitates as discussed by the authors, which has been isolated, purified and characterized by elemental analysis and by its 1H and 13C NMR, Raman and UV spectra.
Abstract: When copper(I) triflate·cis‐cycloheptene is irradiated at 254 nm in n‐hexane solution, cis → trans‐isomerization occurs and the stable complex copper (I) triflate·trans‐cycloheptene precipitates. This complex has been isolated, purified and characterized by elemental analysis and by its 1H and 13C NMR, Raman and UV spectra.