Evaluation of antibacterial activity and toxic metal removal of chemically synthesized magnetic iron oxide titanium coated nanoparticles and application in bacterial treatment.

Co-precipitation method was used for preparation of two types of iron oxide nanoparticles coated by titanium dioxide according to divalent salts used. The average size of iron oxide nanoparticles coated by titanium dioxide measured by particle size analyzer, ranged approximately between 20 nm and 100 nm with mean particle size of 60 nm. Characterization of the prepared nanoparticles was done by X-ray diffraction analysis and scanning electron microscope indicating the sole existence of inverse cubic spinel phase of magnetic iron oxide nanoparticles. Further, the antibacterial activity of two prepared iron oxide nanoparticles was evaluated against four pathogenic bacteria where both preparations showed promising antibacterial activities against Gram positive and Gram negative strains which offers a potential application in pharmaceutical and biomedical industries. The antibacterial activity showed high reduction percent after 30 min by 150 μg mL-1 of nanoparticles prepared. Also, high reduction percent was achieved for removal of iron and manganese ions from polluted water and good effect on decreasing chemical oxygen demand and biochemical oxygen demand concentrations with decreased percent of total nitrogen concentration.