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In the present study, synthesis and characterisation of titanium dioxide (TiO2) nanoparticles concurrently doped with fluorine (F) and manganese (Mn) are studied for the improved photocatalytic degradation and bacterial inhibition. The absorption spectrum observed at 400 nm is blue shifted to 398 nm in co-doped TiO2, which confirmed the increase in incorporation of F and Mn. Transmission electron microscopic images and XRD results confirm that the size of the TiO2 nanoparticles decreased with increasing concentration of co-dopants. Co-doping of TiO2 with F and Mn is confirmed by FTIR, XRD, EDAX and XPS studies. The TiO2 nanoparticles prepared at higher concentration of dopants show the existence of nanorods. It is obvious that the doping of TiO2 with Mn and F can degrade textile wastewater and methylene blue with 120 min of visible light irradiation. The antimicrobial activities of the prepared samples increased with increasing doping level of F and Mn against Staphylococus aureaus and Escherichia coli.

Titanium dioxide nanoparticles were successfully synthesized. The assynthesized TiO 2 nanoparticles were subjected to X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), UV-Vis spectroscopy and Scanning Electron Microscopy (SEM) studies. XRD confirms the formation of anatase phase. The crystallite size of TiO 2 nanoparticles calculated from the broadening of diffraction peaks using Scherer formula was approximately 19.72 nm. From the FTIR spectrum it was observed that the strong band in the range of 900 and 500cm-1 was associated with the characteristic vibrational modes of Ti-O bond and O-Ti-O bridge. This confirms that TiO 2 phase was formed. The optical properties of the synthesized nanoparticles indicate the quantum confinement effect. The absence of any absorption peak in the spectra of as-synthesized TiO 2 nanoparticles were in good agreement with the wide bandgap nature of samples and inability to absorb in the visible range.