Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 312, Issue 1-2, Pages 97-106Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2009.07.012
Keywords
Strontium titanate; Nanocrystal; Mesoporous assembly; Sol-gel method; Structure-directing surfactant; Hydrogen production; Photocatalysis
Categories
Funding
- Faculty Development in Shortage Area Scholarship (Thailand)
- Thailand Research Fund (TRF)
- Commission on Higher Education (Thailand)
- Petrochemical and Environmental Catalysis
- Chulalongkorn University (Thailand)
- Sustainable Petroleum and Petrochemicals Research Unit, Center for Petroleum, Petrochemicals, and Advanced Materials, Chulalongkorn University (Thailand)
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Mesoporous-assembled SrTiO3 nanocrystal-based photocatalysts were synthesized via the sol-gel method with the aid of a structure-directing surfactant. The photocatalytic water splitting activity for hydrogen production over the mesoporous-assembled SrTiO3 nanocrystal-based photocatalysts with various hole scavengers: methanol, ethanol, 2-propanol, D-glucose, and Na2SO3, Was investigated. The pristine mesoporous-assembled SrTiO3 photocatalysts exhibited much higher photocatalytic activity in hydrogen production via the photocatalytic water splitting using methanol as the hole scavenger than both non-mesoporous-assembled commercial photocatalysts: commercial SrTiO3 and commercial TiO2 (Degussa P-25), even if their specific surface areas were lower than those of both commercial photocatalysts. These results point out that the mesoporous assembly of nanocrystals with high pore uniformity plays a significant role, affecting the photocatalytic hydrogen production activity of the SrTiO3 photocatalysts. The Pt co-catalyst enhances the visible light harvesting ability of the mesoporous-assembled SrTiO3 photocatalyst and behaves as the active site for proton reduction, leading to photocatalytic activity enhancement under both UV and visible light irradiation. Methanol provided the highest photocatalytic hydrogen production enhancement. An optimum Pt loading of 0.5 wt.% on the mesoporous-assembled SrTiO3 photocatalyst provided the highest photocatalytic activity, with hydrogen production rates (from 50vol.% methanol aqueous solution systems) of 276 and 188 mu mol h(-1) g(cat)(-1) and quantum efficiencies of 1.9 and 0.9% under UV and visible light irradiation, respectively. (C) 2009 Elsevier B.V. All rights reserved.
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