CAI Li, ZHANG Shu, YANG Fei, BI Jian

(College of Chemistry and Material, Sichuan Normal University, Chengdu 610068, China)

Abstract: The reticular TiO₂ and Fe_x/TiO₂ photo-catalytic materials were prepared by using the leaves of phoenix tree as the template. Their structure and physical properties were characterized by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), photoluminescence (PL) and UV-Vis spectroscopy. The results show that the prepared Fe_0.005/TiO₂ was reticular. When the calcination temperature increases from 600 to 800℃, content of anatase TiO₂ in reticular TiO₂ and Fe_0.005/TiO₂ prepared was decreased and doped Fe³⁺ can lead to the transition of anatase to rutile phase. Compared with Degussa P25, the PL intensity of reticular TiO₂ and Fe_x/TiO₂ revealed a significant decrease, indicating that they had a low recombination rate of photo-induced electrons and holes. The absorbance wavelength of obtained reticular TiO₂ and Fe_x/TiO₂ was red shift and the band gap energy was decreased. The photo-catalytic degradation of malachite green experiments indicated that the photo-catalytic activity of the as-prepared reticular TiO₂ and Fe_x/TiO₂ was much higher than that of commercial Degussa P25. Further investigation revealed that reticular Fe_0.005/TiO₂ has an excellent long-term stability and can be repeated used.

Key words: reticular TiO₂;  Fe_x/TiO₂;  template method;  leaf;  photo-catalysis

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Journal of Molecular Catalysis, Vol. 26, Issue 4, 2012,347-355