Room-Temperature Synthesis of Covalently Bridged MOP@TpPa-CH₃ Composite Photocatalysts for Artificial Photosynthesis

The conversion of CO₂ into useful chemicals via photocatalysts is a promising strategy for resolving the environmental problems caused by the addition of CO₂. Herein, a series of composite photocatalysts MOP@TpPa-CH₃ based on MOP-NH₂ and TpPa-CH₃ through covalent bridging have been prepared via a facile room-temperature evaporation method and employed for photocatalytic CO₂ reduction. The photocatalytic performances of MOP@TpPa-CH₃ are greater than those of TpPa-CH₃ and MOP-NH₂, where the CO generation rate of MOP@TpPa-CH₃ under 10% CO₂ still reaches 119.25 μmol g^-1 h^-1, which is 2.18 times higher than that under pure CO₂ (54.74 μmol g^-1 h^-1). To investigate the structural factors affecting the photocatalytic activity, MOP@TBPa-CH₃ without C═O groups is synthesized, and the photoreduction performance is also evaluated. The controlling experimental results demonstrate that the excellent photoreduction CO₂ performance of MOP@TpPa-CH₃ in a 10% CO₂ atmosphere is due to the presence of C═O groups in TpPa-CH₃. This work offers a new design and construction strategy for novel MOP@COF composites.