Fabrication of Al-Doped TiO2 Visible-Light Photocatalyst for Low-Concentration Mercury Removal
Journal
International Journal of Photoenergy
Journal Volume
2012
Date Issued
2012-04-19
Author(s)
Abstract
High-quality Al-doped TiO 2 visible-light photocatalyst was prepared via a single-step direct combination of vaporized Ti, Al, and O2 using a 6kW thermal plasma system. Results showed that the formed Al-doped TiO 2 nanoparticles were a mixture of anatase and rutile phase and had a size between 10 and 105nm. The absorption spectra of the nanoparticles shifted towards the visible light regions, depending on the Al2O3 addition. Ti 4+ and Ti 3+ coexisted in the synthesized Al-doped TiO 2 ; the Ti 3+ concentration, however, increased with increasing Al2O3 addition due to Al/Ti substitution that caused the occurrence of oxygen vacancy. Hg 0 breakthrough tests revealed that the nanoparticles had an appreciable Hg 0 removal under visible-light irradiation. Nevertheless, moisture reduced Hg removal by the nanoparticles, especially when visible-light irradiation was applied, suggesting that the competitive adsorption between H2O and Hg species on the active sites of TiO 2 surface occurred. Copyright © 2012 Cheng-Yen Tsai et al.
Publisher
HINDAWI LTD
Type
journal article
File(s)![Thumbnail Image]()
Loading...
Name
874509.pdf
Size
2.31 MB
Format
Adobe PDF
Checksum
(MD5):68e0c368a5c577435748864e47d3bbc4