Semiconductor electrodes. 12. Photoassisted oxidations and photoelectrosynthesis at polycrystalline titanium dioxide electrodes

Frank, S. N.; Bard, Allen J.

doi:10.1021/ja00456a024

Cited by 151 publications

(68 citation statements)

References 10 publications

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“…One concludes from these observations that S2-and SO:-, though acting as efficient hole scavengers at n-CdS [7] and n-WO, (pH 1 [S]) electrodes are surprisingly inactive towards Ti02-valence band holes in alkaline solution. Frank & Bard [9] inferred from the absence of current doubling at illuminated Ti02-electrodes (0.1 M NaOH, 1 MS~-) that no holes are transferred from Ti02 to S2-. This agrees with our finding that no H2 is produced under UV illumination of TiOz-dispersions in 0.1 M Na2S (pH 14).…”

Section: Fig2 Photocurrentmentioning

confidence: 99%

Photoreduction of Thiosulfate in Semiconductor Dispersions

Borgarello

Desilvestro

Grätzel

et al. 1983

Helvetica Chimica Acta

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SummaryConduction band electrons produced by band gap excitation of Ti0,-particles reduce efficiently thiosulfate to sulfide and sulfite.2 e$ (Ti02)+ S20$----+ S2-+ SO:-This reaction is confirmed by electrochemical investigations with polycrystalline Ti02-electrodes. The valence band process in alkaline Ti02-dispersions involves oxidation of S20$-to tetrathionate which quantitatively dismutates into sulfite and thiosulfate, the net reaction being: 2h+(Ti02)+ 0.5 S 2 0 z -+ 1.5 H 2 0 ---+ SO=-+ 3 H+ This photodriven disproportionation of thiosulfate into sulfide and sulfite: hv 1.5 H2O+ 1.5 S203--2 SO:-+S2-+3 H + should be of great interest for systems that photochemically split hydrogen sulfide into hydrogen and sulfur.Introduction. -We have shown in a previous investigation [ 11 that illuminations of aqueous CdS/Ru02-suspensions by visible light leads to efficient cleavage of hydrogen sulfide into H2 and S. The mechanism involves band gap excitation of the CdS particle followed by reaction of conduction band electrons with water produce to H2.

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Section: Fig2 Photocurrentmentioning

confidence: 99%

Photoreduction of Thiosulfate in Semiconductor Dispersions

Borgarello

Desilvestro

Grätzel

et al. 1983

Helvetica Chimica Acta

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“…will oxidize the CN -to CNO -, and finally to free CO 3 -and NO 3 -. The photo-catalysis course was described as the following reaction formula [41,42]:…”

Section: Mechanismmentioning

confidence: 99%

Effect of different type of scavengers on the photocatalytic removal of copper and cyanide in the presence of TiO2@yeast hybrids

Zheng

Pan

et al. 2015

J Mater Sci: Mater Electron

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Effect of different type of organic or inorganic additions (formic acid, AgNO 3 , NaCl) on the photocatalytic reduction of copper and photooxidation of cyanide with illuminated TiO 2 @yeast was studied in this work together with the impact of solution pH values and contact time. The results indicated that pH values exhibited a great effect on the adsorption and photocatalytic performance of cyanide and copper because the surface charge of the TiO 2 @yeast and the existence form of cyanide and copper are highly pH dependent. The optimal adsorption and photo-oxidation of cyanide was observed at pH 2.0 while the best adsorptive and photocatalytic efficiency for copper was achieved at pH 5.0 within the studied range. The addition of formic acid increased the photo-reduction rate of copper and inhibited the photo-oxidation of cyanide. AgNO 3 , as electron acceptor, restrained the Cu(II) reduction from 75.0 to 30.5 %, whereas accelerate the photooxidation of cyanide. Besides, the presence of chloride ions retarded the removal efficiency of both cyanide and copper. The first-order kinetic model well described the experimental data. One possible mechanism of the effect of additives on copper and cyanide degradation was discussed.

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“…Hence, NO x abatement is a crucial issue that must be addressed. In recent years, photocatalysis has been emerged as an intriguing technology for various air pollutants destruction since the initial study by Frank and Bard (1977). The merit of this technology is the use of solar energy to achieve the efficient decomposition of recalcitrant substances in mild conditions.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Bi $$_{5}$$ 5 O $$_{7}$$ 7 I Photocatalysts for Efficient Removal of NO in Air Under Visible Light

et al. 2017

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In this study, we report a flower-like Bi 5 O 7 I photocatalyst with a 41% gaseous nitride oxide (NO) removal efficiency under visible light through the in situ thermal treatment of the hierarchical architecture BiOI synthesized using a facile hydrothermal process. The UV-Vis diffuse reflectance spectroscopy and photocurrent experiments showed that the absorption band edge and photo-induced electron-hole pairs separation efficiency of Bi 5 O 7 I were negative than that of BiOI, whereas the as-prepared Bi 5 O 7 I exhibited excellent and stable visible light photocatalytic performance for NO removal as compared with original BiOI and P25. The results of electron spin resonance spectroscopy and density functional theory calculations suggested that the prominent visible light photocatalytic activity of obtained Bi 5 O 7 I has been attributed to the proper electron band structure which oxidizes the O 2 molecule to ·OH radicals with two electrons in the conduction band. Electronic supplementary materialThe online version of this article

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Semiconductor electrodes. 12. Photoassisted oxidations and photoelectrosynthesis at polycrystalline titanium dioxide electrodes

Cited by 151 publications

References 10 publications

Photoreduction of Thiosulfate in Semiconductor Dispersions

Photoreduction of Thiosulfate in Semiconductor Dispersions

Effect of different type of scavengers on the photocatalytic removal of copper and cyanide in the presence of TiO2@yeast hybrids

Three-Dimensional Bi $$_{5}$$ 5 O $$_{7}$$ 7 I Photocatalysts for Efficient Removal of NO in Air Under Visible Light

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