<p>Monophasic Sr²⁺ doped α-Fe₂O₃ nanoparticles were synthesized with varying concentration of Sr²⁺ ions (1wt%, 2.5wt%, 5wt%) via polyol assisted hydrothermal method. Interestingly, α-Fe₂O₃ nanoparticles with 5wt% Sr²⁺ has exhibited enhanced photocatalytic response compared to other Sr²⁺ doped samples. The phase formation of Sr²⁺ doped α-Fe₂O₃ nanoparticles was confirmed through X-ray powder diffraction (XRD) analysis, revealing a rhombohedral crystal structure with crystallite sizes ranging from 38&#xa0;nm to 22&#xa0;nm. Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) were performed on the pristine sample shows 3D flower like morphology, whereas Sr doped α-Fe₂O₃ nanoparticles reveals the formation of flakes like morphology as well as quasi spherical shaped nanoparticles. The optical bandgap of pristine and Sr doped α-Fe₂O₃ nanoparticles was estimated using Tauc plot and was found to be around 1.91&#xa0;eV and 2.03&#xa0;eV. The rise of the bandgap may be ascribed to the reduction in crystallite size concurrent with the increased addition of Sr²⁺ addition. The X-ray Photoelectron Spectroscopy (XPS) confirms the presence of an Sr²⁺ charge state and the presence of few oxygen vacancies after doping with Sr²⁺ ions. The M-H curves obtained for these nanoparticles shows the asymmetric and unsaturated hysteresis loop, which is a sign of antiferromagnetic behaviour. Photocatalytic degradation studies carried out these nanoparticles showed enhanced degradation efficiency of methylene Blue (MB) dye of about 96% for Sr²⁺ doped samples (5wt%) compared to pristine, which had only 65%. These superior properties will find great potential applications in the degradation of various environmental water pollutants.</p>