| 초록 |
Iron oxide (Fe2O3) has been widely studied as an attractive visible light harvesting material due to its low band gap energy (2.1 eV), low cost, and low toxicity. In photocatalysis, Fe2O3 showed low photocatalytic activity for organic degradation due to its poor conductivity and low charge-separation ability (high recombination rate). Till overcoming poor activity of pure Fe2O3, we prepared ordered mesoporous heterostructure of Fe2O3 with TiO2 for combining physicochemical properties of those, and heterojunction formation which could enhance exciton separation. Thus, We prepared ordered mesoporous Fe2O3, TiO2, and Fe2O3–TiO2 composites with different molar Ti to Fe ratio via nano-replication method using KIT-6 for obtaining large surface area (active sites). As results, the highest photocatalytic activity was obtained at (1:1) Ti:Fe molar ratio. The reason why ordered mesoporous Fe2O3–TiO2 (1:1) exhibited excellent photocatalytic activity under both UV and visible light can be explained as a consequence of the large surface area of mesoporous Fe2O3–TiO2 (1:1), low band gap energy (1.90 eV), and improved exciton separation ability by heterojunctions between Fe2O3 and TiO2. |
