Synthesis of Double-Shell Hollow TiO₂@ZIF-8 Nanoparticles With Enhanced Photocatalytic Activities

Synthesis of semiconductor-MOF heterostructure photocatalysts has attracted considerable attention for their thermal stability, controllable crystallinity, and enhanced photocatalytic activity. In this work, the hollow nanostructure of anatase TiO₂ was prepared by etching SiO₂ from core-shell SiO₂@TiO₂ nanoparticles. ZIF-8, one of the metal-organic frameworks (MOFs), was hybrid synthesized on the surface of hollow TiO₂ and formed double-shell hollow nanoparticles. The photocatalytic activity of the double-shell hollow TiO₂@ZIF-8 nanoparticles toward methylene blue (MB) under UV light irradiation was processed, and the highest photocatalytic efficiency of 99.1% was shown compared with TiO₂ and SiO₂@TiO₂ nanoparticles. This study suggests a promising approach to achieve an advanced photocatalytic performance toward dye degradation using MOFs for the surface engineering of semiconductors.