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Photodeposition of Prussian Blue Films on TiO2: Additive Effect of Methanol and Influence of the TiO2 Crystal Form

✍ Scribed by Hiroaki Tada; Satoru Tsuji; Seishiro Ito

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
134 KB
Volume
239
Category
Article
ISSN
0021-9797

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✦ Synopsis

The coupling of TiO 2 and transition metal complexes is attempted with the aim of higher functionalization of the TiO 2 photocatalyst. UV irradiation (Ξ» ex > 300 nm) of a TiO 2 suspension containing equimolar aqueous solutions of FeCl 3 and K 3 [Fe(CN) 6 ] forms uniform thin films of "water-insoluble Prussian blue" (PB, Fe 3+ 4 [Fe II (CN) 6 ] 3 ) on the surface of TiO 2 particles. The PB photodeposition is enhanced significantly by the addition of a small amount of CH 3 OH in both the rutile and anatase TiO 2 systems. The activity of anatase TiO 2 is greater than that of rutile in the presence of CH 3 OH (2.46 M) by a factor of 1.6 Β± 0.2, whereas the activities are comparable in the absence of CH 3 OH. These results are discussed on the basis of a proposed reaction mechanism.

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