Synthesis, structure and photocatalytic activity of nano TiO2 and nano Ti1-xMxO2-δ (M = Cu, Fe, Pt, Pd, V, W, Ce, Zr)

We have synthesized 5–7 nm size, highly crystalline TiO2 which absorbs radiation in the visible region of solar spectrum. The material shows higher photocatalytic activity both in UV and visible region of the solar radiation compared to commercial Degussa P25 TiO2. Transition metal ion substitution...

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Bibliographic Details
Published in:Pramāṇa 2005-10, Vol.65 (4), p.641-645
Main Authors: Hegde, M. S., Nagaveni, K., Roy, Sounak
Format: Article
Language:English
Subjects:
Catalytic activity
Copper
Holes (electron deficiencies)
Oxidation
Palladium
Photocatalysis
Platinum
Solar radiation
Titanium dioxide
Transition metals
Zirconium
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Summary:We have synthesized 5–7 nm size, highly crystalline TiO2 which absorbs radiation in the visible region of solar spectrum. The material shows higher photocatalytic activity both in UV and visible region of the solar radiation compared to commercial Degussa P25 TiO2. Transition metal ion substitution for Ti4+ creates mid-gap states which act as recombination centers for electron-hole induced by photons thus reducing photocatalytic activity. However, Pt, Pd and Cu ion substituted TiO2 are excellent CO oxidation and NO reduction catalysts at temperatures less than 100° C.
ISSN:0304-4289
0973-7111
DOI:10.1007/BF03010452