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Unique phase transformation behavior and visible light photocatalytic activity of titanium oxide hybridized with copper oxide

Title
Unique phase transformation behavior and visible light photocatalytic activity of titanium oxide hybridized with copper oxide
Authors
Kim T.W.Ha H.-W.Paek M.-J.Hyun S.-H.Choy J.-H.Hwang S.-J.
Ewha Authors
최진호황성주하형욱
SCOPUS Author ID
최진호scopus; 황성주scopus
Issue Date
2010
Journal Title
Journal of Materials Chemistry
ISSN
0959-9428JCR Link
Citation
vol. 20, no. 16, pp. 3238 - 3245
Indexed
SCOPUS WOS scopus
Abstract
The nanoscale hybridization of titanium oxide with copper oxide was carried out to control the phase transformation behavior of titanium oxide and develop a new photocatalyst active in visble light. Analysis by X-ray diffraction, electron microscopy, and nitrogen adsorption-desorption isotherm to gauge pore size distribution showed that intercalative hybridization between copper oxide and titanium oxide produced a mesoporous layer-by-layer interstratified heterostructure with a repeating distance of ∼24.2 Å and an average pore size of ∼52 Å. X-ray absorption spectroscopy at Cu K- and Ti K-edges clearly demonstrated that divalent copper oxides were interstratified with lepidocrocite-type titanium oxide. As a result of the modification of band structure, the resulting nanohybrids showed high activity for photoinduced degradation of organic dye molecules under visible light illumination. Heat-treatment of the nanohybrids at 500°C produced anatase TiO2 at the expense of intermediate rutile TiO2 formed in the lower temperature region (300-400°C). This suggests a phase transition from rutile TiO2 to anatase TiO2. This phenomenon is related to the variation in the surface energy of titania caused by the redox process of hybridized copper oxide and by the phase transition of co-existing Ti-deficient titanium oxide. © 2010 The Royal Society of Chemistry.
DOI
10.1039/b922510b
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자연과학대학 > 화학·나노과학전공 > Journal papers
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