Ag and TiO2 nanoparticles co-modified defective zeolite TS-1 for improved photocatalytic CO2 reduction

Photocatalytic CO2 reduction into fuels has been an attractive research topic. Herein, Ag and TiO2 nanoparticles co-loaded zeolite TS-1 (Ag-TiO2/TS-1) were synthesized by the ion-exchange and subsequently in-situ photodeposition method. The obtained Ag-TiO2/TS-1 sample has a high surface area and rich Ti3+-Vo defects and as well as highly dispersed Ag nanoparticles. As expected, the sample Ag-TiO2/TS-1 not only shows high CO2 adsorption capacity, but also improves the separation efficiency of photogenerated electron-hole pairs. As a result, only CO and CH4 can be detected on the sample Ag-TiO2/TS-1 in the photocatalytic CO2 conversion, and the competing H-2 evolution can be completely suppressed, suggestive of its high selectivity. The super photocatalytic activity toward CO2 reduction can be ascribed to the synergistic effect among highly dispersed Ag nanoparticle, the support zeolite TS-1 and TiO2 with highly exposed {101} planes.

Automated summary

The study synthesized zeolite TS-1 co-loaded with silver and titanium dioxide nanoparticles using ion-exchange and in-situ photodeposition methods, resulting in a sample with high surface area, rich defects, and highly dispersed silver nanoparticles. The sample exhibited high CO2 adsorption capacity and improved separation efficiency of photogenerated electron-hole pairs, leading to selective CO and CH4 production with suppressed H2 evolution during photocatalytic CO2 conversion. The super photocatalytic activity was attributed to the synergistic effect among the dispersed silver nanoparticles, support zeolite TS-1, and titanium dioxide with highly exposed {101} planes.