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Visible light driven reduction of carbon dioxide with water on modified Sr3Ti2O7 catalysts
Velu Jeyalakshmi, Kandasamy Thirunavukkarasu, Konda Ramasamy Krishnamurthy, Balasubramanian Viswanathan
Published in Royal Society of Chemistry
2015
Volume: 5
   
Issue: 8
Pages: 5958 - 5966
Abstract
Layered perovskite type Sr3Ti2O7 catalysts, doped with N, S and Fe have been prepared by modified polymer complex method, characterized and evaluated for photo reduction of CO2 in aqueous alkaline medium using UV-visible radiation. EDXA and XRD data reveal the incorporation of the dopants into the titanate matrix. The presence of N in substitutional and interstitial locations, S as S6+ and Fe as Fe3+ species are indicated by XPS analysis. DRS and photo luminescence studies show that the dopants form additional energy levels within the band gap, promoting visible light absorption and retarding recombination of the charge carriers. Morphological changes and smaller crystallites also minimize recombination. Layered structure of Sr3Ti2O7 facilitates easy transport of charge carriers and separation of oxidation/reduction reaction centres. Structural, morphological and photo physical characteristics of doped catalysts improve the activity significantly. Sr3Ti2O7 co-doped with N, S and Fe together, displays maximum apparent quantum yield for CO2 reduction products. This journal is © The Royal Society of Chemistry.
About the journal
JournalData powered by TypesetRSC Advances
PublisherData powered by TypesetRoyal Society of Chemistry
ISSN20462069
Open AccessNo
Concepts (18)
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    Catalyst activity
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    CATALYSTS
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    Charge carriers
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    Doping (additives)
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    Electromagnetic wave absorption
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    Energy gap
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    Iron compounds
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    Light
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    Light absorption
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    LAYERED PEROVSKITE
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    Layered structures
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    Morphological changes
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    OXIDATION/REDUCTION
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    Physical characteristics
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    TRANSPORT OF CHARGE
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    Visible light absorption
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    VISIBLE-LIGHT-DRIVEN
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    Carbon dioxide