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In this paper, the photocatalytic activity of Fe-TiO2 nanoparticles (NPs) under fluorescent light was studied using Escherichia coli and Staphylococcus aureus. Fe-TiO2 NPs were synthesized using a sol-gel method and characterized with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectroscopy (UV-vis DRS) and transmission electron microscopy. The efficiency of photocatalytic inactivation towards E. coli was studied under different physicochemical parameters. The photocatalytic inactivation rate increased with increasing Fe content in TiO2 NPs and the highest inactivation was achieved for 3.0 mol% Fe-TiO2 NPs under fluorescent light. These results demonstrate that the presence of an optimum concentration of Fe in TiO2 matrix enhances the photocatalytic inactivation of TiO2 NPs under fluorescent light.

The photocatalytic degradation of methylene blue (MB) has been investigated under visible light irradiation with an incandescent light bulb using chromium doped TiO 2 nanoparticles. Cr-TiO 2 photocatalysts were successfully synthesized by sol-gel method at room temperature and characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), Raman spectroscopy, Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy. The band gap energy of the nanoparticles were estimated using UVVis DRS technique. With increasing Cr 3? cations content into TiO 2 host lattice, the optical absorption band tuned in the visible region. XRD and TEM results reveal uniform and crystalline anatase TiO 2 nanoparticles. The photodegradation of MB indicated that the photocatalytic activity of pure TiO 2 nanoparticles increased with increasing Cr 3? cations concentration.

For the better success of biomedical implant surgery, we used a modified solution combustion method to synthesize Hydroxyapatite (HA) and Chromium (Cr 3 + ) modified Cr-HA with different concentrations of 0.5, 1.0, 1.5, 2.0 and 2.5. The Cr-HA nanopowder was characterized by TGA, XRD, SEM-EDS and TEM. The HA and Cr-HA powders were subjected to in vitro biological studies to determine their biocompatibility and hemocompatibility. The cytotoxicity of HA and Cr-HA were evaluated on Hela (Cervical cancer) cells and L929 (mouse fibroblast) cells by using MTT assay. Hemocompatibility studies demonstrated a noticeable haemolytic ratio below 5%, which confirms that these materials are compatible in nature with human blood. The results of the present work confirm that the synthesised HA and Cr-HA are biocompatible and can be extensively used in the biomedical field to improve overall material biological properties.

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