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Effect of sacrificial electron donors on hydrogen generation over visible light–irradiated nonmetal-doped TiO2 photocatalysts

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Abstract

Hydrogen generation over carbon-, nitrogen- and sulfur-doped TiO2 semiconductor photocatalysts (represented as C–TiO2, N–TiO2 and S–TiO2, respectively) under visible light irradiation has been achieved using various sacrificial electron donors, namely triethanolamine, diethanolamine, monoethanolamine, triethylamine, MeOH, EtOH, EDTA, l-ascorbic acid and phenol. The highest initial rate of H2 production was found to be in the range 1,000–2,200 μmol/g/h at ambient conditions when triethanolamine was used as sacrificial electron donor. The efficacy of hydrogen production over these photocatalysts depends strongly on the nature of the sacrificial electron donor and decreases in the following order: C–TiO2 > S–TiO2 > N–TiO2. The results of the present studies suggest that the rate of H2 production is not simply governed by the reduction potential of the sacrificial electron donor but also by the kinetic barrier of the electron transfer process.

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Acknowledgments

This work was carried out under the financial support from CSIR (India) Network Project (NWP-022). DC is thankful to Prof. Goutam Biswas, Director of the Central Mechanical Engineering Research Institute, for his encouragement to this work.

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Authors and Affiliations

  1. Chemistry Group and Biomimetics Group, CSIR-Central Mechanical Engineering Research Institute, Durgapur, 713209, India

    Ujjwal Pal, Sarita Ghosh & Debabrata Chatterjee

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  1. Ujjwal Pal
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  2. Sarita Ghosh
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  3. Debabrata Chatterjee
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Correspondence to Debabrata Chatterjee.

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Pal, U., Ghosh, S. & Chatterjee, D. Effect of sacrificial electron donors on hydrogen generation over visible light–irradiated nonmetal-doped TiO2 photocatalysts. Transition Met Chem 37, 93–96 (2012). https://doi.org/10.1007/s11243-011-9562-3

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  • DOI: https://doi.org/10.1007/s11243-011-9562-3

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