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 µmol⋅g− 1⋅h− 1 at 80 ◦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.
Thermally assisted photocatalysis: Highly selective conversion of CO2 to CO in flue gas using NH2-MXene/TiO2/ZnTCPP
Li, Cong;Zamponi, Silvia;Berrettoni, Mario;
2025-01-01
Abstract
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 µmol⋅g− 1⋅h− 1 at 80 ◦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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
