Synergic photocatalytic effects of nitrogen and niobium co-doping in TiO2 for the redox conversion of aquatic pollutants under visible light

Jonghun Lim, Palanichamy Murugan, Narayanan Lakshminarasimhan, Jae Young Kim, Jae Sung Lee, Sang-Hyup Lee, Wonyong Choi

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Nitrogen and niobium co-doped TiO2 was synthesized by a simple sol-gel method and its visible light photocatalytic activities were compared with bare, N-, and Nb-doped TiO2. The synthesized photocatalysts were characterized by powder X-ray diffraction (XRD), diffuse reflectance UV-Visible absorption spectroscopy, FT-IR spectroscopy, X-ray photoelectron spectroscopy, and energy-dispersive X-ray analysis. TiO2 co-doped with N and Nb can have unique properties distinguished from the singly doped TiO2 in the aspects of the dopant-induced charge distribution, vacancy sites, structural stability, defect energy levels, and optical absorption. The most notable is that the visible light absorption by (N,Nb)-TiO2 was significantly higher than either of N- or Nb-TiO2 sample. The doped samples exhibited a slight change in the band gap (by ∼0.1 eV) compared with bare TiO2, which could be confirmed by Tauc plot, Mott- Schottky plot, and the electronic structure calculation. The co-doping of N and Nb in TiO 2 induced the creation of the mid-gap levels and Ti3+ states that enhance the visible light absorption. The photocatalytic activities of bare, N-, Nb-, and (N,Nb)-TiO2 were compared for the photocatalytic degradation of 4-chlorophenol (4-CP), oxidation of iodide, and reduction of chromate (CrVI) in the aqueous phase under visible light (λ > 420 nm). For all tested substrates, (N,Nb)-TiO2 exhibited the markedly higher activities than either N-TiO2 or Nb-TiO2. A similar trend was also observed for the photocurrent generation under visible light irradiation.

Original languageEnglish
Pages (from-to)91-99
Number of pages9
JournalJournal of Catalysis
Volume310
DOIs
Publication statusPublished - 2014 Feb 1

Fingerprint

Niobium
niobium
Light absorption
contaminants
Nitrogen
Doping (additives)
electromagnetic absorption
nitrogen
plots
Chromates
x rays
chromates
Energy dispersive X ray analysis
Charge distribution
structural stability
Iodides
Photocatalysts
Photocurrents
Absorption spectroscopy
X ray powder diffraction

Keywords

  • Co-doping
  • Photocatalytic water purification
  • Solar catalysis
  • TiO
  • Visible light photocatalysts

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Cite this

Synergic photocatalytic effects of nitrogen and niobium co-doping in TiO2 for the redox conversion of aquatic pollutants under visible light. / Lim, Jonghun; Murugan, Palanichamy; Lakshminarasimhan, Narayanan; Kim, Jae Young; Lee, Jae Sung; Lee, Sang-Hyup; Choi, Wonyong.

In: Journal of Catalysis, Vol. 310, 01.02.2014, p. 91-99.

Research output: Contribution to journalArticle

Lim, Jonghun ; Murugan, Palanichamy ; Lakshminarasimhan, Narayanan ; Kim, Jae Young ; Lee, Jae Sung ; Lee, Sang-Hyup ; Choi, Wonyong. / Synergic photocatalytic effects of nitrogen and niobium co-doping in TiO2 for the redox conversion of aquatic pollutants under visible light. In: Journal of Catalysis. 2014 ; Vol. 310. pp. 91-99.
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