Single-Step Synthesis of Al-Doped TiO2 Nanoparticles Using Non-Transferred Thermal Plasma Torch

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概要

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• Al-doped TiO2 nanoparticles possessing visible-light photocatalytic activity were fabricated with an atmospheric-pressure thermal plasma system via a single-step direct combination of vaporized Ti, Al, and O2. Pure Ti and Al2O3 powders and ultrahigh-purity O2 were used as the precursors. The experimental results showed that the size of synthesized TiO2 was between 10 and 105 nm. Nevertheless, the nanoparticles with sizes smaller than 50 nm accounted for approximately 80% of the total number. The observed size reduction appeared to be the suppression on particle growth due to the introduction of Al species into TiO2 crystal. The largest specific surface area of the Al-doped TiO2 was 44 m2\cdotg-1. The anatase phase was noticeably decreased with increasing the Al2O3 addition. The absorption spectra of Al-doped TiO2 shifted from UV to visible-light region with respect to an increase in Al2O3 addition. Oxygen in the formed TiO2 was found to be in TiO2 crystal lattice and in surface hydroxyl groups. Both Ti4+ and Ti3+ existed in the formed TiO2. However, the Ti3+ amount significantly increased with increasing Al2O3 addition due to Al/Ti substitution and the resulted oxygen vacancy.

• 2012-01-25

著者

• BAI Hsunling

  Institute of Environmental Engineering, National Chiao Tung University

• Sun Hung-Dar

  Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung 811, Taiwan

• Fan Kuo-Shuh

  Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung 811, Taiwan

• Bai Hsunling

  Institute of Environmental Engineering, National Chiao Tung University, Hsinchu 300, Taiwan

• Tsai Cheng-Yen

  Graduate Institute of Engineering Science and Technology, National Kaohsiung First University of Science and Technology, Kaohsiung 811, Taiwan

• Hsi Hsing-Cheng

  Institute of Environmental Engineering and Management, National Taipei University of Technology, Taipei 106, Taiwan

関連論文

• Synthesis of Nanoscale Adsorbents and Catalysts via Aerosol Route and Air Pollution Control Applications
• Single-Step Synthesis of Al-Doped TiO2 Nanoparticles Using Non-Transferred Thermal Plasma Torch

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