Visible light induced hydrogen evolution over the heterosystem Bi2S3/TiO2

Brahimi, R.; Bessekhouad, Y.; Bouguelia, A.; Trari, M.

doi:10.1016/j.cattod.2007.01.030

Cited by 93 publications

(52 citation statements)

References 7 publications

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“…The photocatalysis was performed in an experimental set up previously described in details (Brahimi et al 2007). In brief, the tests were carried out in a double walled Pyrex-reactor placed in a fixed position to keep a constant photons flux and whose temperature was maintained at 25°C by a thermostated bath.…”

Section: Methodsmentioning

confidence: 99%

Visible Light Induced NO2 − Removal Over CuCrO2 Catalyst

Ketir

Bouguelia

Trari

2008

Water Air Soil Pollut

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The delafossite CuCrO 2 is a promising candidate for the visible light driven catalysis. The NO 2 − removal by photoelectrochemical process is studied under mild conditions, close to that encountered in the natural environment. CuCrO 2 exhibits a long term chemical stability with a corrosion rate of 0.34 μmol m −2 year −1 in KCl (0.5 M). A forbidden band of 1.3 eV has been evaluated from the diffuse reflectance spectrum. The flat band potential (−0.07 V SCE ) determined from the Mott-Schottky plot is close to the photocurrent onset potential (0 V SCE ). Hence, the conduction band is positioned at −1.08 V SCE and thus lies below the NO 2 − level leading to a feasible reduction upon visible illumination. The conversion occurs in less than ∼5 h with a quantum efficiency of ∼0.5%. The possibility of identifying the reaction products via the intensity-potential characteristics was explored by using standard solutions. The decrease of the conversion rate over time is attributed to the competitive water reduction. In absence of catalyst, NO 2 − is oxidized to NO 3 − in air equilibrated solution and the reaction follows a first order kinetic with a half life of 21 h, NO 3 − has been identified by iodometry through copper titration.

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Section: Methodsmentioning

confidence: 99%

Visible Light Induced NO2 − Removal Over CuCrO2 Catalyst

Ketir

Bouguelia

Trari

2008

Water Air Soil Pollut

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“…The activity of such a composite is significantly higher than that of the individual bismuth sulfide and reaches a maximum with the components in an equimolar ratio [73].…”

Section: Photocatalytic Systems Based On Semiconductor Heterostructuresmentioning

confidence: 99%

“…The Bi 2 S 3 /TiO 2 nanostructures, characterized by photocatalytic activity in the release of hydrogen from aqueous solutions of Na 2 S or Na 2 SO 3 , were formed by the hydrolysis of thiourea by heating in the presence of Bi(NO 3 ) 3 and nanocrystalline TiO 2 (Degussa P25) [73]. The activity of such a composite is significantly higher than that of the individual bismuth sulfide and reaches a maximum with the components in an equimolar ratio [73].…”

Section: Photocatalytic Systems Based On Semiconductor Heterostructuresmentioning

confidence: 99%

Semiconductor photocatalytic systems for the production of hydrogen by the action of visible light

et al. 2009

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Data on investigations of recent years on the creation of semiconductor photocatalytic systems for the production of hydrogen from water and aqueous solutions of electron-donating substrates are reviewed. Physicochemical approaches to extending the range of spectral sensitivity of the semiconductors (the use of sensitizers, semiconducting heterostructures, doping with metals and metalloids) are examined. Possible ways of improving the photocatalytic systems for the production of hydrogen with metal-sulfide and other types of semiconductors are analyzed. A general description of the advances and planned developments in the creation of photocatalytic converters of solar energy is given.

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“…Various strategies have been developed such as doping with anions (N, S, F, C, P) [20][21][22] and cations (V, Cr, Co, Fe) [23][24][25] as well as creating couple semiconductor junctions such as ZnO/TiO 2 , CdS/TiO 2 , etc. [26,27]. On the other hand, efforts also have been devoted towards improving the photocatalytic efficiency by controlling the particle size, morphology and microstructure.…”

Section: Introductionmentioning

confidence: 99%

Visible light assisted photocatalytic degradation of organic dyes on TiO2–CNT nanocomposites

Hemalatha

Madras

Ramesha

2014

J Sol-Gel Sci Technol

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Carbon nanotubes (CNTs) uniformly decorated with nano-anatase TiO 2 particles corresponding to different TiO 2 -CNT weight ratios (up to 90 % TiO 2 :10 % CNT) were prepared by employing sol-gel process. The nanocomposites were characterized by X-ray diffraction, IR, Raman, Scanning electron microscopy, Transmission electron microscopy, Photoluminescence, BET surface area and diffuse reflectance measurements. The composites show visible light assisted photocatalytic property, for example, the 90 % TiO 2 -10 % CNT composite completely degrades Indigo Carmine dye within 1 h of exposure to visible light. Similarly, Orange G and Congo Red dyes were decomposed within 2 h under visible light irradiation. The excellent visible light photocatalytic property of the composite is attributed to the synergetic effect of photoexcitation and photosensitization. This is due to the special nanoarchitecture wherein TiO 2 nanoparticles are anchored to CNT surface that provides high specific interfacial area for photon absorption and electron trapping.

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Visible light induced hydrogen evolution over the heterosystem Bi2S3/TiO2

Cited by 93 publications

References 7 publications

Visible Light Induced NO2 − Removal Over CuCrO2 Catalyst

Visible Light Induced NO2 − Removal Over CuCrO2 Catalyst

Semiconductor photocatalytic systems for the production of hydrogen by the action of visible light

Visible light assisted photocatalytic degradation of organic dyes on TiO2–CNT nanocomposites

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