TiO 2-x nanoparticles synthesized using He/Ar thermal plasma and their effectiveness on low-concentration mercury vapor removal

Cheng Yen Tsai, Hsing Cheng Hsi*, Hsun-Ling Bai, Kuo Shuh Fan, Chienchih Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Oxygen-vacant titanium dioxide (TiO 2-x ) nanoparticles were synthesized using thermal plasma as a heating source at various applied plasma currents and He/Ar ratios. Samples with diverse characteristics were developed and the mercury removal effectiveness was subsequently evaluated. TiO 2 nanoparticles possessing high purity and uniform particle sizes were successfully synthesized using metal titanium and O 2 as precursors and Ar as plasma gas. TiO 2-x in anatase phase with a particle size at 5-10 nm was formed at the He/Ar volume ratio of 25/75. Further increasing the He/Ar ratio elevated the plasma temperature, causing the tungsten to melt, vaporize from the cathode, and then dope into the formed TiO 2 nanoparticles. The doped W appeared to inhibit the growth of nanoparticles and decrease the crystallinity of formed anatase. The effectiveness of oxygen-vacant sites on Hg 0 removal under the visible light circumstance was confirmed. Hg 0 removal by the TiO 2-x nanoparticles was enhanced by increasing the O 2 concentration. However, moisture reduced Hg 0 capture, especially when light irradiation was applied. The reduction in Hg 0 capture may be resulted from the competitive adsorption of H 2 O on the active sites of TiO 2-x with Hg 0 and transformed Hg 2+ .

Original languageEnglish
Pages (from-to)4739-4748
Number of pages10
JournalJournal of Nanoparticle Research
Volume13
Issue number10
DOIs
StatePublished - 1 Oct 2011

Keywords

  • Adsorption
  • Environmental remediation
  • Mercury
  • Oxygen vacant
  • Photocatalyst
  • Visible light

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