| 초록 |
We investigated the formation of surface complex between TiO2 and common electron donors (methanol, formic acid, acetic acid, triethanolamine, and EDTA) that can absorb visible light through ligand-to-metal charge transfer (LMCT) mechanism. The visible light activity of TiO2-EDTA complex was outstanding among all tested TiO2-substrate complexes. The complexation of EDTA on TiO2 induced a visible light absorption up to 550 nm and exhibited a marked visible light activity for both the reductive conversion of Cr(VI) and production of H2. The optimal concentration of EDTA was 100 M for the reduction of Cr(VI) but much higher (10 mM) for the production of H2. The TiO2-EDTA electrode also generated a significant level of photocurrent under visible light irradiation. |
