Comparison of catalytic activity of two platinised TiO2 films towards the oxidation of organic pollutants.
Two types of platinised TiO2 films, i.e., Pt-TiO2/ITO and Pt(TiO2)/ITO, were prepared by a procedure of dip-coating and subsequent photo-deposition, and photo-deposition and subsequent dip-coating, respectively. They were well characterized by DRS, XRD spectra, SEM microscopy and photoelectrochemical measurement. Their photocatalytic, dark catalytic and photoelectrocatalytic activities were investigated using formic acid as a model organic pollutants. Compared with pure TiO2/ITO film, the photocatalytic activity of the platinised TiO2 films were apparently improved. However, the improvement was considerably dependent on the preparation method of these films. Pt-TiO2/ITO not only possessed higher photocatalytic activity but also showed a dark catalytic activity towards HCOOH degradation. As a sequence, it was first emphasized that the dark catalytic effect of Pt-TiO2/ITO was partly responsible for degradation of formic acid in the photocatalytic oxidation process. Although the Pt(TiO2)/ITO film does not exhibit the dark catalytic activity, its photocatalytic degradation efficiencies towards HCOOH are higher than that of Pt-TiO2/ITO film. Therefore, in view of enhanced photocatalytic activity, the Pt(TiO2)/ITO was more favored than Pt-TiO2/ITO film.
He
Chun
C
School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China. chun-he@aist.go.jp
Shu
Dong
D
Xiong
Ya
Y
Zhu
Xihai
X
Li
Xiangzhong
X
D002384:Catalysis; D005561:Formates / Q000737:chemistry* / Q000528:radiation effects*; D005898:Glass / Q000737:chemistry; D010084:Oxidation-Reduction; D010777:Photochemistry; D010984:Platinum / Q000737:chemistry*; D017971:Tin Compounds / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods
D005561:Formates; D017971:Tin Compounds; D014874:Water Pollutants, Chemical; C030544:formic acid; C009495:titanium dioxide; D010984:Platinum; C109984:indium tin oxide; D014025:Titanium