Semnan University Press Applied Chemistry Today 2981-2437 16 60 2021 09 23 Methane production by CO2 photo-reduction in the presence of TiO2 modified by Nickel and Copper Methane production by CO2 photo-reduction in the presence of TiO2 modified by Nickel and Copper 37 48 5435 10.22075/chem.2021.19404.1776 FA Reza Nematollahi Tehran, Sharif University of Technology, Faculty of Chemical and Petroleum Engineering Afsanehsadat Larimi Tehran, Niroo Research Institute, Chemistry and Process Research Group Cyrus Ghotbi Tehran, Sharif University of Technology, Faculty of Chemical and Petroleum Engineering Farhad Khorasheh Tehran, Sharif University of Technology, Faculty of Chemical and Petroleum Engineering Mohsen Moradi Tehran, Sharif University of Technology, Faculty of Chemical and Petroleum Engineering Journal Article 2019 12 29 Carbon dioxide photocatalytic reduction is one of the promising methods used to produce a wide range of renewable hydrocarbon fuels using sunlight in the presence of photocatalysts. In this study, a series of nickel-doped titanium dioxide samples (0.5, 1, and 1.5 wt%) Were synthesized by Sol-gel method. After performing photocatalytic carbon dioxide recovery experiments and finding the optimum percentage of nickel, titanium dioxide sample with 1 wt% nickel (TNi1) showed the highest photocatalytic activity. Then, by impregnation method, 3% by weight of Cu (1, 2 and 3 wt%) was loaded onto the TNi1 structure. Finally, the sample loaded with 1 wt% copper on titanium dioxide doped with 1 wt% Ni (1Cu/TNi1) showed the highest photocatalytic activity and methane production was 12.6 μmol/gcat that was about 4 times higher than the amount of methane produced in the presence of pure TiO2. The synthesized nanophotocatalysts were characterized using X-ray diffraction (XRD) analysis, diffuse reflectance spectroscopy (DRS) analysis and photoluminescence (PL) analysis. Also, their specific surface area was measured by BET method and morphology of the particles was investigated by field emission scanning electron microscopy. Carbon dioxide photocatalytic reduction is one of the promising methods used to produce a wide range of renewable hydrocarbon fuels using sunlight in the presence of photocatalysts. In this study, a series of nickel-doped titanium dioxide samples (0.5, 1, and 1.5 wt%) Were synthesized by Sol-gel method. After performing photocatalytic carbon dioxide recovery experiments and finding the optimum percentage of nickel, titanium dioxide sample with 1 wt% nickel (TNi1) showed the highest photocatalytic activity. Then, by impregnation method, 3% by weight of Cu (1, 2 and 3 wt%) was loaded onto the TNi1 structure. Finally, the sample loaded with 1 wt% copper on titanium dioxide doped with 1 wt% Ni (1Cu/TNi1) showed the highest photocatalytic activity and methane production was 12.6 μmol/gcat that was about 4 times higher than the amount of methane produced in the presence of pure TiO2. The synthesized nanophotocatalysts were characterized using X-ray diffraction (XRD) analysis, diffuse reflectance spectroscopy (DRS) analysis and photoluminescence (PL) analysis. Also, their specific surface area was measured by BET method and morphology of the particles was investigated by field emission scanning electron microscopy. https://chemistry.semnan.ac.ir/article_5435_d93b2bdc93e61eac1a59dca6851a2ecd.pdf