Metal‐Organic Framework MIL‐125 Derived Mg<sup>2+</sup>‐Doped Mesoporous TiO<sub>2</sub> for Photocatalytic CO<sub>2</sub> Reduction
Xuhui Feng, Fuping Pan, Peng Zhang, Xiao Wang, Hong‐Cai Zhou, Yongheng Huang, Ying Li
Abstract
Abstract In this study, Mg 2+ ‐doped mesoporous TiO 2 photocatalysts derived from Mg 2+ adsorption (MA) process on MIL‐125, a metal‐organic framework material, were prepared and employed for photocatalytic reduction of CO 2 to produce CO. The Mg 2+ doping concentration was controlled by varying the Mg 2+ concentration in the Mg 2+ adsorption process. It was demonstrated that the Mg 2+ doping promoted the generation of surface Ti 3+ and significantly increased transient photocurrent density. Over a 4 h UV/Vis irradiation period, the best performing photocatalyst, 1MA, delivered a CO production rate ∼20 times higher than that of P25, a commercially available TiO 2 nanopowder. It is believed that the Mg 2+ adsorption process introduced more favorable properties to the TiO 2 photocatalysts, such as higher surface area and porosity for more reactive sites, and concentrated surface Ti 3+ centers for improved charge transfer.