Photocatalytic activities of europium (III) and niobium (V) co-doped TiO2 nanopowders synthesized in Ar/O2 radio-frequency thermal plasmas

Chenning Zhang, Tetsuo Uchikoshi, Ji Guang Li, Takayuki Watanabe, Takamasa Ishigaki

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Europium (III) and niobium (V) co-doped TiO2 nanopowders were synthesized in Ar/O2 radio-frequency thermal plasmas by pyrolyzing aqueous precursors that contained various concentrations of Eu 3+/(Eu3+ + Nb5+ + Ti4+) = 0-0.5 at.% and Nb5+/(Eu3+ + Nb5+ + Ti4+) = 0-1.0 at.%. Phase identification was performed by X-ray diffraction (XRD), particle morphology was observed by transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM), and UV-vis absorption spectra were determined by UV-vis spectroscopy. The photocatalytic activities under UV and visible light irradiations were both evaluated by bleaching 20 μM of a methyl orange aqueous solution. All the resulting powders had a phase composition of anatase (30-66 nm crystalline size) (major phase: ∼80% mass proportion) and rutile (56-94 nm crystalline size) polymorphs, with a relatively wide particle size distribution from several nanometers (faceted crystallites) to ∼100 nm (spherical particles). The photocatalytic activities dominated by oxygen defects in the TiO2 host lattice for the powders prepared with identical doping concentrations of Eu3+ and Nb5+ were both superior under UV and visible light irradiations over those obtained with different doping amounts. More interestingly, the co-doped powder exhibited an improved photocatalytic performance under 600-700 nm visible light illumination than the Eu3+-doped TiO2 and P25 commercial powders.

Original languageEnglish
Pages (from-to)37-43
Number of pages7
JournalJournal of Alloys and Compounds
Volume606
DOIs
Publication statusPublished - Sep 5 2014
Externally publishedYes

Fingerprint

Niobium
Plasma Gases
Europium
Powders
Plasmas
Doping (additives)
Irradiation
Crystalline materials
Bleaching
High resolution transmission electron microscopy
Ultraviolet spectroscopy
Polymorphism
Crystallites
Phase composition
Particle size analysis
Titanium dioxide
Absorption spectra
Lighting
Oxygen
Transmission electron microscopy

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Photocatalytic activities of europium (III) and niobium (V) co-doped TiO2 nanopowders synthesized in Ar/O2 radio-frequency thermal plasmas. / Zhang, Chenning; Uchikoshi, Tetsuo; Li, Ji Guang; Watanabe, Takayuki; Ishigaki, Takamasa.

In: Journal of Alloys and Compounds, Vol. 606, 05.09.2014, p. 37-43.

Research output: Contribution to journalArticle

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abstract = "Europium (III) and niobium (V) co-doped TiO2 nanopowders were synthesized in Ar/O2 radio-frequency thermal plasmas by pyrolyzing aqueous precursors that contained various concentrations of Eu 3+/(Eu3+ + Nb5+ + Ti4+) = 0-0.5 at.{\%} and Nb5+/(Eu3+ + Nb5+ + Ti4+) = 0-1.0 at.{\%}. Phase identification was performed by X-ray diffraction (XRD), particle morphology was observed by transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM), and UV-vis absorption spectra were determined by UV-vis spectroscopy. The photocatalytic activities under UV and visible light irradiations were both evaluated by bleaching 20 μM of a methyl orange aqueous solution. All the resulting powders had a phase composition of anatase (30-66 nm crystalline size) (major phase: ∼80{\%} mass proportion) and rutile (56-94 nm crystalline size) polymorphs, with a relatively wide particle size distribution from several nanometers (faceted crystallites) to ∼100 nm (spherical particles). The photocatalytic activities dominated by oxygen defects in the TiO2 host lattice for the powders prepared with identical doping concentrations of Eu3+ and Nb5+ were both superior under UV and visible light irradiations over those obtained with different doping amounts. More interestingly, the co-doped powder exhibited an improved photocatalytic performance under 600-700 nm visible light illumination than the Eu3+-doped TiO2 and P25 commercial powders.",
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