Periodic mesoporous organosilica functionalized hollow TiO2 sphere for selective aerobic oxidation

A promising synthetic method of functionalized titanium dioxide (TiO2) has been proposed in this work which combined photoactive porphyrin-periodic mesoporous organosilica (PMO) with hollow TiO2 nanospheres to achieve a multi-component synergistic system. The prepared composite TiO2@Pro showed photocatalytic ac-tivity in aerobic oxidation of sulfide in the aqueous phase under visible light. The high reactivity was attributed to the increased adsorption and diffusion of substrates due to the catalyst's large specific surface area (337 m2/g), amphiphilicity, wide visible light absorption, and high electron-hole pair separation rate. This strategy provides a new way of designing TiO2-based photocatalysts for heterogeneous catalysis under visible light.

Automated summary

This study proposes a promising synthetic method for functionalized titanium dioxide (TiO2) by combining photoactive porphyrin-periodic mesoporous organosilica (PMO) with hollow TiO2 nanospheres, forming a multi-component synergistic system. The prepared composite TiO2@Pro exhibits photocatalytic activity in the aerobic oxidation of sulfide in the aqueous phase under visible light. The high reactivity is attributed to the catalyst's large specific surface area, amphiphilicity, wide visible light absorption, and high electron-hole pair separation rate. This strategy provides a new approach for designing TiO2-based photocatalysts for heterogeneous catalysis under visible light.