ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Transition metal doped TiO2 (Ni, Fe, Cu) and nanocomposite TiO2 powders with rutilephase were synthesized by mechanical alloying and heat treatment, and were characterized byXRD, TEM, UV-DRS, and PL (Photoluminescence). Photocatalytic activity was also investigatedwith the degradation rate of 4-chlorophenol and measured by total organic carbon analyzer. TEMEDPand XRD patterns showed that the transition metal doped powders (only alloyed powder) werein the form of rutile phase with the particle size of 20-30 nm. The average grain size of transitionmetal doped powders was in the range of less than 10 nm. However, after heat treatment, thealloyed powder formed composite of the titanate and rutile phase. The UV-DRS and PLinvestigation showed that Ni doped 8 wt% nanocomposite TiO2 had the higher wavelength range(600-660 nm) (2.0-1.9 eV) than that of the commercial P-25 powder(380-400 nm) by Degussa Co.indicating that the Ni 8 wt% doped nanocomposite TiO2 shifted the absorption into the visible lightregion and thus, enhanced the photocatalytic activity. Further, these results agreed well with TOCinvestigation. Formation of titanate in transition metal doped TiO2 due to heat treatment was foundto control the grain growth of nano-sized TiO2 and to enhance its thermal stability at hightemperature
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.119.195.pdf
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