Titania Derived from NH₂-MIL-125(Ti) Metal–Organic Framework for Selective Photocatalytic Conversion of CO₂ to Propylene Carbonate

Titanium dioxide was prepared using titanium-based metal–organic framework (MOF) i.e., NH₂-MIL-125(Ti) as a metal precursor. NH₂-MIL-125(Ti) was synthesized then calcined at 400 °C, 500 °C, 550 °C, and 600 °C. The properties of NH₂-MIL-125(Ti) and produced TiO₂ were investigated using various techniques, including powder X-ray diffraction (PXRD), Brunauer–Emmett–Teller (BET), and UV–visible diffuse reflectance spectroscopy (UV–Vis DRS). A scanning electron microscopy (SEM) was used to observe surface morphology and energy-dispersive X-ray spectroscopy (EDX) to analyze elemental composition of prepared samples. PXRD pattern confirms TiO₂ anatase phase formation when Ti-MOF was calcined up to 500 °C, whereas the formation of TiO₂ rutile phase at calcination temperature of 600 °C. The photocatalytic activities of produced TiO₂ photocatalysts were investigated for the cycloaddition reaction of CO₂ to propylene oxide.