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Mesoporous iron oxide-layered titanate nanohybrids: Soft-chemical synthesis, characterization, and photocatalyst application

Title
Mesoporous iron oxide-layered titanate nanohybrids: Soft-chemical synthesis, characterization, and photocatalyst application
Authors
Kim T.W.Ha H.-W.Paek M.-J.Hyun S.-H.Baek I.-H.Choy J.-H.Hwang S.-J.
Ewha Authors
최진호황성주
SCOPUS Author ID
최진호scopus; 황성주scopus
Issue Date
2008
Journal Title
Journal of Physical Chemistry C
ISSN
1932-7447JCR Link
Citation
vol. 112, no. 38, pp. 14853 - 14862
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Mesoporous iron oxide-layered titanate nanohybrids have been synthesized through a reassembling reaction between exfoliated titanate nanosheets and iron hydroxide nanoclusters, in which an electrostatic attraction between both nanosized species could be achieved at low pH of 1.5. The formation of the layer-by-layer ordered heterostructure with the repeating unit of 1.33 nm was clearly evidenced by powder X-ray diffraction and transmission electron microscopic analysis. According to Fe K-edge X-ray absorption spectroscopy, the hybridized iron oxide crystallizes with loosely packed network of three edge-shared FeO 6 octahedra units. N 2 adsorption-desorption isotherm and diffuse reflectance UV-vis measurements clearly demonstrated that the present iron oxide-layered titanate nanohybrids showed greatly expanded surface areas with mesopores (∼190-230 m 2g -1) and narrow bandgap energies (∼2.3 eV), which are of crucial importance in creating a visible light-active photocatalyst. The test of photocatalytic activity revealed that the present nanohybrids could induce the photodegradation of organic pollutant molecules under visible light illumination (λ > 420 nm). Of special interest is that the chemical stability of iron oxide became remarkably improved upon the hybridization, which could be understood as a result of the encapsulation with titanate layers. In this regard, we could conclude that the present hybridization route is very effective in synthesizing novel visible light-active photocatalysts as well as in stabilizing chemically labile species like iron oxides. © 2008 American Chemical Society.
DOI
10.1021/jp805488h
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자연과학대학 > 화학·나노과학전공 > Journal papers
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