In this research, we have studied the doping behaviors of two transition metal ion dopants on the crystal phase, particle sizes, XRD patterns, EDAX spectra,  and photoreactivity of TiO₂ nanoparticles. The crystallite size of TiO₂ particles is close to 4nm calculated from(10 1) peak by using FWHM method in Scherrer’s equation. Test metal ion concentrations ranged from 1% to 4 at.%,  we report the growth of Fe & Mn doped TiO₂  nanocrystals prepared by Sol-Gel technique, followed by freeze-drying treatment at -30°C temperature for 12hrs. The obtained Gel was thermally treated at different temperature like 200,400,600, 800°C. The Gouy balance study found samples to be paramagnetic at room temperature. The photoreactivities of transition metal ion-doped TiO₂ nanoparticles under UV irradiation were quantified by the degradation of formaldehyde.

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