Sol-gel derived Bismuth modified TiO2, a highly visible light response nano-photocatalyst for CO2 photoreduction
Paper ID : 1114-ICNS
Authors:
Reza Nematollahi1, Cyrous Ghotbi2, Farhad Khorasheh1, Afsanehsadat Larimi *3, Mohsen Moradi1
1Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran,Iran
2Department of Petroleum and Chemical Engineering, Sharif University of Technology, Tehran, Iran
3Chemical and Process Engineering Department, Niroo Research Institute, Tehran, Iran
Abstract:
The CO2 photoreduction process is considered as a promising method in order to produce a vast range of renewable hydrocarbon fuels by solar energy in the presence of photocatalysts. In this study, a series of Bi-doped TiO2 samples with different Bi content (1, 3 and 5 wt %) were synthesized by the sol-gel method and tested for CO2 reduction under visible light. Prepared nano-photocatalysts were characterized by XRD, FESEM, DRS and BET analysis. BET results show Bi substitution in the TiO2 lattice results in the significant increase in specific surface area. DRS analysis indicates that doped samples have considerably better light absorption in the visible region and with lower band gap energy compared with un-doped TiO2. Results of reactions revealed that methane production considerably increased in the presence of Bi-doped samples. The highest performance observed over 3 wt % Bi-doped TiO2 (16.9 ╬╝mol/gcat) almost 5 times more than un-doped TiO2.
Keywords:
Nano-photocatalysts; TiO2; Bi; CO2 photoreduction
Status : Abstract Accepted (Poster Presentation)