Visible-light-induced photocatalytic activity in FeNbO4 nanoparticles

In Sun Cho, Sangwook Lee, Jun Hong Noh, Geun Kyu Choi, Hyun Suk Jung, Dong-Wan Kim, Kug Sun Hong

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

A novel method was used to synthesize orthorhombic FeNbO4 nanoparticles by a hydrothermal process followed by calcination at 600°C, and their optical, photoelectrochemical, and photocatalytic properties were investigated. The microstructural and local structural properties were characterized using X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy (TEM), and Raman spectroscopy. The FeNbO4 particles obtained were composed of much smaller nanocrystallines, with an average size of 10-20 nm, compared to particles prepared at 1000°C through a conventional solid-state reaction method. Moreover, the optical band gap energy of the nanoparticles was estimated to be 1.93 eV from the UV-vis diffuse reflectance, and their flat-band potential in 1 M NaOH was -0.4 V (SCE). The X-ray photoelectron spectroscopy analysis revealed that the nanoparticles had fewer surface defects, such as oxygen vacancies, than the particles prepared by the solid-state reaction method. The FeNbO 4 nanoparticles also exhibited a much higher photocatalytic activity for the degradation of rhodamine B dye solution under visible light irradiation (>420 nm). This higher photocatalytic activity of the FeNbO4 nanoparticles was attributed to their higher optical absorption ability and smaller particle size, as well as fewer surface defects.

Original languageEnglish
Pages (from-to)18393-18398
Number of pages6
JournalJournal of Physical Chemistry C
Volume112
Issue number47
DOIs
Publication statusPublished - 2008 Nov 27
Externally publishedYes

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Nanoparticles
nanoparticles
rhodamine B
Surface defects
surface defects
Solid state reactions
solid state
Optical band gaps
Oxygen vacancies
rhodamine
Field emission
Calcination
roasting
Light absorption
Raman spectroscopy
Structural properties
field emission
optical absorption
x rays
Coloring Agents

ASJC Scopus subject areas

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

Cite this

Visible-light-induced photocatalytic activity in FeNbO4 nanoparticles. / Cho, In Sun; Lee, Sangwook; Noh, Jun Hong; Choi, Geun Kyu; Jung, Hyun Suk; Kim, Dong-Wan; Hong, Kug Sun.

In: Journal of Physical Chemistry C, Vol. 112, No. 47, 27.11.2008, p. 18393-18398.

Research output: Contribution to journalArticle

Cho, In Sun ; Lee, Sangwook ; Noh, Jun Hong ; Choi, Geun Kyu ; Jung, Hyun Suk ; Kim, Dong-Wan ; Hong, Kug Sun. / Visible-light-induced photocatalytic activity in FeNbO4 nanoparticles. In: Journal of Physical Chemistry C. 2008 ; Vol. 112, No. 47. pp. 18393-18398.
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