Res. Chem. Intermed.
, Vol. 30, No. 7-8, pp. 793–805 (2004)
Also available online - www.vsppub.com
Interaction between Ti-gel and silver, copper, as well as
nickel compounds under ultrasound irradiation
WEIPING HUANG, SUWEN LIU, XIANGHAI TANG, MENACHEM MOTIEI,
YURI KOLTYPIN and A. GEDANKEN
Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel
Received 8 December 2003; accepted 15 April 2004
were prepared by sonication. The interactions of Ti-gel
with silver, copper and nickel ions under ultrasound irradiation are very different, although these ions
can be dispersed very well in titania. The results of EDXA and XRD analysis indicate that Ti-gel does
not react with AgCl and crystallizes unaffectedly to form rutile. M(OH)
(M = CuandNi),onthe
other hand, favors polycondensation with Ti-gel and affects the crystallization of Ti-gel. CuO favors
stabilization of the anatase phase. Ni
ions tend to incorporate more easily into titania than Cu
ions do when the samples are calcined. TEM, and BET were also used to characterize the samples.
Keywords: Sonication; Ti-gel; X-ray diffraction; energy dispersive X-ray diffraction.
Titanium oxide is a low toxic n-type semiconductor (band gap 3.2 eV), which has
three crystalline phases: brookite, anatase and rutile. The anatase and rutile have
good thermal and chemical stability. Therefore, titanium oxide is widely used as
a photocatalyst [1– 3] and as a substrate for supporting catalysts [4–6]. However,
the low quantum efﬁciency and the lack of absorption of visible light of the pure
titanium oxide limits its practical use. Some supported or doped catalysts based on
titanium oxide have better catalytic activity as compared to pure titania. Silver,
copper and nickel supported on or doped in titania exhibit catalytic activity for
hydrogenation [7, 8] or oxidation dehydrogenation , and they are also good
photocatalysts [10, 11]. For example, H
O decomposes into H
and stoichiometrically on NiO/TiO
under solar light .
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