AbstractThis paper reports the effect of aging time (2, 4 and 6 days) on the formation of mesoporous mitania nanoparticles (MTN) prepared via sol-gel method. The structural properties of the prepared catalysts were investigated by X-ray diffraction (XRD), Field-emission scanning electron microscopy (FESEM) with EDX analysis and N2 adsorption-desorption analysis (BET). The XRD analysis revealed that MTNs were successfully synthesized and possessed different crystallite size depending on the aging time. Morphology studies using FESEM-EDX witnessed the formation of agglomerated spherical nanoparticles in the range of 5-50 nm and uniform distribution of Ti and O on the surface of catalysts. N2 adsorption-desorption analyses demonstrated MTN-2 possessed the largest surface area and pore volume compared to the MTN-4 and MTN-6, which due to blockage of the interparticle voids and excessive particles growth of MTN upon prolonged aging time. The MTN-2 achieved 88.35% of MB photodegradation within 210 m.....