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Cobalt Ion-Doped TiO2 Photocatalyst Response to Visible Light

✍ Scribed by Mitsunobu Iwasaki; Masayoshi Hara; Hiromi Kawada; Hiroaki Tada; Seishiro Ito

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
61 KB
Volume
224
Category
Article
ISSN
0021-9797

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✦ Synopsis

Photocatalytic activity under visible light irradiation was generated by doping a small amount of Co 2+ ions into TiO 2 particles. Nanometer-sized particles with the composition xCoO-(100x) TiO 2 (xCo/TiO 2 ; 0 ≀ x ≀ 6.0) were prepared from TiOSO 4 β€’ 4.5H 2 O and Co(CH 3 COO) 2 β€’ 4H 2 O in an ethanol-water solution containing NaOH under reflux. The photoreactivity of xCo/TiO 2 was evaluated by the rate of CH 3 CHO degradation. The Co 2+ ion doping (0.01 ≀ x ≀ 0.27) not only enhanced the photocatalytic activity under ultraviolet-visible (Ξ» > 300 nm) light irradiation but also induced the visible light (Ξ» > 400 nm) response. The highest photocatalytic activities were obtained at x = 0.03 for both irradiations.

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