In situ fabrication of amorphous TiO2/NH2-MIL-125(Ti) for enhanced photocatalytic CO2 into CH4 with H2O under visible-light irradiation

A series of amorphous TiO2/NH2-MIL-125(Ti) (Am-TiO2/NM) composites were in-situ fabricated via one-pot facile water (H2O) bath method. The photocatalytic performance of as-synthesized samples was evaluated by CO2 reduction with H2O under visible-light irradiation. The Am-TiO2/NM with 22.6 wt% Am-TiO2 loading had the highest photo activity for CO2 reduction into CH4 (1.18 μmol·h-1·g-1catalyst), which was 1.7 times higher than that of pure NM. The enhanced photocatalytic activity was attributed to the formation of the strong interactions between NM and Am-TiO2, which not only improved the ability of electron transfer, but also inhibited the recombination of electron-hole pairs. Furthermore, the optimum sample showed satisfied stability within five times recycling tests during the photo reaction under visible-light irradiation. These kinds of MOF-based composites provided potential applications in the field of energy conversion.