| 초록 |
Porphyrins are well known photosensitizer because of their strong absorption in visible region. Here, tetra-phenyl-porphyrin (TPP), tetra-4-hydroxyphenyl-porphyin (THPP), and tetra-4-carboxyphenyl-porphyin (TCPP) were successfully synthesized and anchored on TiO2 nanoparticulates. It was observed that TCPP adsorbed strongly and irreversibly onto TiO2 surface when compared with THPP. However, TPP hardly adsorbed onto TiO2 due to the lack of anchoring group. The photoreactivity of porphyrin sensitized TiO2 was tested for the degradation of dyes such as methyl orange (MO) and methylene blue (MB) in suspension under visible light irradiation with ＞ 420 nm. TCPP-TiO2 showed the best visible light photoreactivity for the dye de-colorization among the all sensitized TiO2 samples including CdS-TiO2 inorganic sensitizing system. It was also observed that the photocurrent was efficiently generated with TCPP-TiO2 prepared in a film form under visible light. Incorporation of metal ions such as Zn, Cu, and Sn in TCPP was also investigated. |
