Multimetal tantalate CsBi2Ta5O16 for photocatalytic conversion of CO2 with H2O into CH4 and O2

The photocatalytic conversion of CO 2 and H 2 O into a series of value-added products is regarded as an important way to mimic natural photosynthesis for solar harvesting. Herein, we prepared CsBi 2 Ta 5 O 16 with a cubic pyrochlore structure via high-temperature molten salt method as a photocatalyst for the first time. The NiO-loaded CsBi 2 Ta 5 O 16 composites could efficiently photocatalyze the conversion of CO 2 into CH 4 and CO, and oxidize H 2 O to O 2 . With 10 wt% NiO loading, the highest yield of CH 4 (7.24 μmol g −1 h −1 ) and O 2 (3.59 μmol g −1 h −1 ) could be achieved. The adsorption and activation of CO 2 molecule on NiO can be attributed to the enhanced CO 2 photocatalytic conversion by the NiO-loaded CsBi 2 Ta 5 O 16 composites. This work provides a design idea of photocatalyst for the full reaction of CO 2 with H 2 O.