Thermally assisted photocatalysis: Highly selective conversion of CO2 to CO in flue gas using NH2-MXene/TiO2/ZnTCPP

Converting CO2 from flue gas into valuable chemicals has always been an important research field. This study developed a thermally assisted photocatalytic reduction of flue gas CO2 system at the gas-solid interface, utilizing an NH2-MXene/TiO2/ZnTCPP (Zn-NMT) composite. Zn-NMT exhibited a CO generation rate of 236.17 mu mol center dot g- 1 center dot h- 1 at 80 degrees C with thermal assistance, achieving 100 % CO selectivity. Notably, it showed superior cyclic stability at 88 %, significantly surpassing the NMT (39 %). The findings indicated that the introduction of photosensitizer ZnTCPP expands the light absorption spectrum, thereby enhancing photonic utilization efficiency. Moreover, ZnTCPP and TiO2 can form an S-scheme heterojunction, and the use of MXene as a charge transport bridge effectively suppresses the recombination of electron-hole pairs generated by photoexcitation, which in turn notably extends the catalyst's longevity. Zn-NMT catalyst shows great potential in reducing CO2 emissions from flue gas and promoting the utilization of CO2 resources, offering new insights and methods for related fields.