| 초록 |
In the present work demonstrated that reduced TiO2 is prepared by a two-step method, magnesiothermic reduction in 5% H2/Ar followed by acid washing, and investigated with respect to its utility in CO2 photoreduction to CH4. The improved light absorption and suitable band edge position of reduced TiO2, sensitized with photodeposited Pt nanoparticles, results in a significant enhancement of CH4 evolution. Thus, reduced anatase TiO2 exhibited a relatively stable performance with a threefold increase in the rate of CH4 production (1640.58 ppm g−1 h−1, 1.13 μmol g−1 h−1) as compared to anatase TiO2 nanoparticles (546.98 ppm g−1 h−1, 0.38 μmol g−1 h−1). The improved photocatalytic performance is attributed to enhanced light absorption, suitable band edge alignment with respect to the CO2/CH4 redox potential, and efficient separation of photogenerated charges. |
