Zinc Tetrakis (4-Carboxyphenyl) Porphyrin Intercalation Modification in CoAl-Layered Double Hydroxides for Efficient Photocatalytic Reduction of CO2.

In order to enhance the light absorption capacity and promote the interlayer electron transport of CoAl-layered double hydroxides (CoAl-LDHs), a composite material of Zinc tetrakis (4-carboxyphenyl) porphyrin (ZnTCPP) intercalated into CoAl-LDHs interlayer was prepared by the exfoliation and re-stacking method. The optimized composite exhibited excellent performance toward photocatalytic CO2 reduction to CO, with an average CO evolution rate of 57.2 μmol·g-1·h-1, which was 5.84 times and 2.87 times higher than those of pristine CoAl-LDHs (9.8 μmol·g-1·h-1) and ZnTCPP (19.9 μmol·g-1·h-1), respectively. It is found that the intercalated ZnTCPP in CoAl-LDHs could greatly improve the light absorption capacity and promote the interlayer electron transport, resulting in high photocatalytic CO2 reduction performance.