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

Tae Woo Kim, Hyung Wook Ha, Mi Jeong Paek, Sang Hoon Hyun, Il Hyun Baek, Jin Ho Choy, Seong Ju Hwang

Research output: Contribution to journalArticle

84 Citations (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 FeO6 octahedra units. N2 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 m2g-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.

Original languageEnglish
Pages (from-to)14853-14862
Number of pages10
JournalJournal of Physical Chemistry C
Volume112
Issue number38
DOIs
Publication statusPublished - 2008 Sep 25

Fingerprint

Photocatalysts
Iron oxides
iron oxides
synthesis
X ray absorption spectroscopy
Organic pollutants
Nanosheets
Nanoclusters
Chemical stability
Photodegradation
nanoclusters
Encapsulation
X ray powder diffraction
hydroxides
attraction
contaminants
Isotherms
Heterojunctions
Electrostatics
Desorption

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

Cite this

Kim, Tae Woo ; Ha, Hyung Wook ; Paek, Mi Jeong ; Hyun, Sang Hoon ; Baek, Il Hyun ; Choy, Jin Ho ; Hwang, Seong Ju. / Mesoporous iron oxide-layered titanate nanohybrids : Soft-chemical synthesis, characterization, and photocatalyst application. In: Journal of Physical Chemistry C. 2008 ; Vol. 112, No. 38. pp. 14853-14862.
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Mesoporous iron oxide-layered titanate nanohybrids : Soft-chemical synthesis, characterization, and photocatalyst application. / Kim, Tae Woo; Ha, Hyung Wook; Paek, Mi Jeong; Hyun, Sang Hoon; Baek, Il Hyun; Choy, Jin Ho; Hwang, Seong Ju.

In: Journal of Physical Chemistry C, Vol. 112, No. 38, 25.09.2008, p. 14853-14862.

Research output: Contribution to journalArticle

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T1 - Mesoporous iron oxide-layered titanate nanohybrids

T2 - Soft-chemical synthesis, characterization, and photocatalyst application

AU - Kim, Tae Woo

AU - Ha, Hyung Wook

AU - Paek, Mi Jeong

AU - Hyun, Sang Hoon

AU - Baek, Il Hyun

AU - Choy, Jin Ho

AU - Hwang, Seong Ju

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Y1 - 2008/9/25

N2 - 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 FeO6 octahedra units. N2 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 m2g-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.

AB - 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 FeO6 octahedra units. N2 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 m2g-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.

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