TiO2/Sepiolite nanocomposites doped with rare earth ions

Preparation, characterization and visible light photocatalytic activity

Feng Zhou, Chunjie Yan, Qi Sun, Sridhar Komarneni

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Several rare earth (RE)-doped TiO2/Sepiolite (RE-TiO2/Sep) photocatalysts were prepared via microwave-hydrothermal treatment using six different types of RE ions: La, Ce, Pr, Nd, Eu or Gd. The obtained nanocomposites were characterized by using BET, XPS, PL and UV-vis techniques. The results revealed that the structures and chemical properties of the nanocomposites were significantly dependent on the radius of the RE3+. Since the radius of RE3+ is much larger than that of Ti4+, Ti4+ could replace RE3+ in the lattice of RE2O3 in the form of Ti3+ state and create a charge imbalance due to their smaller ionic radii. Correspondingly, for charge balance, more OH will be adsorbed. The unoccupied 4f level of RE acts as a scavenger for photogenerated electrons, while surface adsorbed OH acts as a hole trap, separating the photogenerated electron-hole pairs effectively. Eu-TiO2/Sep nanocomposite showed the best photocatalytic activity among all the RE-doped nanocomposites studied. The enhanced visible-light activity is mainly attributed to the enhanced separation of photoinduced carriers, low band gap energy, strong visible light absorption, high adsorption capacity and uniform distribution of titania nanoparticles on sepiolite as support.

Original languageEnglish (US)
Pages (from-to)25-32
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume274
DOIs
StatePublished - Jan 15 2019

Fingerprint

Rare earths
Nanocomposites
nanocomposites
rare earth elements
Ions
preparation
radii
ions
Hole traps
Electrons
Photocatalysts
electromagnetic absorption
chemical properties
Light absorption
Chemical properties
Energy gap
X ray photoelectron spectroscopy
titanium
Titanium
Microwaves

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

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title = "TiO2/Sepiolite nanocomposites doped with rare earth ions: Preparation, characterization and visible light photocatalytic activity",
abstract = "Several rare earth (RE)-doped TiO2/Sepiolite (RE-TiO2/Sep) photocatalysts were prepared via microwave-hydrothermal treatment using six different types of RE ions: La, Ce, Pr, Nd, Eu or Gd. The obtained nanocomposites were characterized by using BET, XPS, PL and UV-vis techniques. The results revealed that the structures and chemical properties of the nanocomposites were significantly dependent on the radius of the RE3+. Since the radius of RE3+ is much larger than that of Ti4+, Ti4+ could replace RE3+ in the lattice of RE2O3 in the form of Ti3+ state and create a charge imbalance due to their smaller ionic radii. Correspondingly, for charge balance, more OH− will be adsorbed. The unoccupied 4f level of RE acts as a scavenger for photogenerated electrons, while surface adsorbed OH− acts as a hole trap, separating the photogenerated electron-hole pairs effectively. Eu-TiO2/Sep nanocomposite showed the best photocatalytic activity among all the RE-doped nanocomposites studied. The enhanced visible-light activity is mainly attributed to the enhanced separation of photoinduced carriers, low band gap energy, strong visible light absorption, high adsorption capacity and uniform distribution of titania nanoparticles on sepiolite as support.",
author = "Feng Zhou and Chunjie Yan and Qi Sun and Sridhar Komarneni",
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TiO2/Sepiolite nanocomposites doped with rare earth ions : Preparation, characterization and visible light photocatalytic activity. / Zhou, Feng; Yan, Chunjie; Sun, Qi; Komarneni, Sridhar.

In: Microporous and Mesoporous Materials, Vol. 274, 15.01.2019, p. 25-32.

Research output: Contribution to journalArticle

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T1 - TiO2/Sepiolite nanocomposites doped with rare earth ions

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AU - Zhou, Feng

AU - Yan, Chunjie

AU - Sun, Qi

AU - Komarneni, Sridhar

PY - 2019/1/15

Y1 - 2019/1/15

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AB - Several rare earth (RE)-doped TiO2/Sepiolite (RE-TiO2/Sep) photocatalysts were prepared via microwave-hydrothermal treatment using six different types of RE ions: La, Ce, Pr, Nd, Eu or Gd. The obtained nanocomposites were characterized by using BET, XPS, PL and UV-vis techniques. The results revealed that the structures and chemical properties of the nanocomposites were significantly dependent on the radius of the RE3+. Since the radius of RE3+ is much larger than that of Ti4+, Ti4+ could replace RE3+ in the lattice of RE2O3 in the form of Ti3+ state and create a charge imbalance due to their smaller ionic radii. Correspondingly, for charge balance, more OH− will be adsorbed. The unoccupied 4f level of RE acts as a scavenger for photogenerated electrons, while surface adsorbed OH− acts as a hole trap, separating the photogenerated electron-hole pairs effectively. Eu-TiO2/Sep nanocomposite showed the best photocatalytic activity among all the RE-doped nanocomposites studied. The enhanced visible-light activity is mainly attributed to the enhanced separation of photoinduced carriers, low band gap energy, strong visible light absorption, high adsorption capacity and uniform distribution of titania nanoparticles on sepiolite as support.

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