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Mesoporous I-Ag codoped titania and alumina modified titania catalysts: Synthesis, characterization and photocatalytic properties

Paper ID Volume ID Publish Year Pages File Format Full-Text
40866 45869 2012 8 PDF Available
Title
Mesoporous I-Ag codoped titania and alumina modified titania catalysts: Synthesis, characterization and photocatalytic properties
Abstract

Mesoporous iodine and silver codoped titania and alumina modified titania photocatalysts were synthesized by a two-step surfactant-templated hydrothermal route and characterized by X-ray diffraction, XPS, UV–visible diffuse reflectance spectroscopy and nitrogen adsorption. The mesoporous materials had surface areas of 2.6–5.3 times that of Degussa P25. The I-Ag codoped mesoporous titania samples exhibited a bicrystalline framework of rutile and anatase with rutile fractions of 23% and 26%, respectively, whereas the alumina-containing I-Ag codoped materials yielded anatase as the only crystalline phase. The I-Ag codoped photocatalysts with Ag/Ti mole ratio of 1.6% and 2.0% showed catalytic activity 3.3 times and 12 times higher than Degussa P25 under halogen visible and visible light (>400 nm) in photodecomposing methyl orange, respectively. The high performance of I-Ag codoped titania and alumina modified titania photocatalysts under visible light is attributed to the combined effects of large surface area, lower band gap energies and mesoporous structure.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (100 K)Download as PowerPoint slideHighlights► High surface area mesoporous I-Ag-TiO2 and I-Ag-TiO2-Al2O3 photocatalyts synthesized. ► I-Ag-TiO2 and I-Ag-TiO2-Al2O3 shifted UV–vis adsorption into the visible range.► The presence of Ag facilitated the incorporation of I in the structure. ► Ag-I-TiO2 and Ag-I-TiO2-Al2O3 with visible light photocatalysis up to 12× P25.

Keywords
Iodine and silver modified titania; Photocatalysts; Mesoporous titania; Methyl orange photodecomposition; Anatase–rutile titania
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Mesoporous I-Ag codoped titania and alumina modified titania catalysts: Synthesis, characterization and photocatalytic properties
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 433–434, 8 August 2012, Pages 18–25
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us