금속 담지 광촉매의 활성에 관한 연구

이상수, 김현종, 박주일, 정경택, 설용건

연세대학교 화학공학과

Photocatalytic activity of metal ion doped titania

Sang Soo Lee, Hyun Jong Kim, Joo Il Park, Kyung Taek Jung

and Yong Gun Shul

Department of Chemical Engineering, Yonsei University, Seoul, Korea

Environmental purification using photocatalysts has attracted a great deal of attention over the last 20 years because of its broad applicability to common oxidizable air contaminants. It is well known that TiO2 shows excellent photocatalytic activity for removal of evironmental pollutants. The highly attractive advantages of photocatalytic treatment are operation at ambient temperature and pressure, use of molecular oxygen as the oxidant, and final oxidation products that are usually innocuous. Although many semiconducting oxides have been investigated as potential photocatalysts, TiO2 gathers much attention due to that it is inexpensive, photochemically stable and it produces the highest oxidation rates. Although TiO2 is the most useful photocatalyst, the search for new materials in heterogeneous photocatalysis continues to be a matter of interest at the present. Doping titania with transition metal ions has been tested as a promising way of improving the photocatalytic activity of TiO2.

In this paper, titania particles were prepared from TiCl4. And, we doped the iron or tungsten ion on the TiO2 particles to improve the photocatalytic characteristics. Photodegradation of acetaldehyde was tested to to examine a number of preparation variables which affect the photocatalytic activity of Fe or W doped TiO2 catalyst.

All of the metal doped titania prepared in this paper showed anatase phase of TiO2. For the iron doped TiO2, any iron complex was not be found in both of XRD and Raman spectra. It might be due to the well dispersion of Fe ion in the TiO2 lattice. In the case of tungsten doped TiO2, however, 12-tungstate was formed with anatase TiO2. And, as increasing the concentration of tungsten, 12-tungstate peak was decreased.

In the study of photocatalytic activity of metal doped TiO2, as increasing the concentration of W or Fe ion, the reactivity was decreased. The reaction rate was drastically increased after 300□ heat treatment. Furthermore, the photocatalytic activity of iron or tungsten doped TiO2 was higher than synthesized pure TiO2 and commercial TiO2.