전이금속 담지 탄소계 기공 소재 제조 및 광촉매 특성 연구

Abstract

Mechanism of general photocatalytic degradation is that the hole (h+) and the electron (e-) was generated in the valence band and conduction band when the light having energy more than band gap is irradiated to a TiO2, and then the decomposition is made of the reaction with object material of decomposition. However, when generated holes and electrons are unable to react with other materials, they are rapidly reunited and the photo-catalytic function is lost. Furthermore, a TiO2 shows considerably efficient photoreaction activity under the ultraviolet range but it has disadvantage that there is no activity in the visible light band. In this study, the problem of this kind of photocatalyst is tried to be supplemented. That is, by utilizing transition metal, and etc. which can shows electronic transition with a TiO2 in the visible light area, photocatalyst was prepared, which can have photocatalytic activity in the wide wavelength range till not only the ultraviolet region but also the visible light area and prevent the recombination of the electron and the hole hindering the photoreaction. For this, by using the ion exchange method, a TiO2 precursor was dipped into H typed highly acidic ion-exchange resin, and the transition metal precursor and etc. was dipped into. And two kind of photocatalysts (Ti-M-SCM) in which transition metal and titanium dioxide exist at the same time through the carbonization/activation process was prepared. Moreover, the photolytic reaction under the wavelengths 254nm and 365nm was performed aimed at the humic acid in the continuous reactor in order to estimate the efficiency of produced Ti-M-SCM.