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Visible active reduced graphene oxide loaded titania for photodecomposition of ciprofloxacin and its antibacterial activity

Raja, A., Selvakumar, K., Rajasekaran, P., Arunpandian, M., Ashokkumar, S., Kaviyarasu, K., Asath Bahadur, S., Swaminathan, M.
Colloids and surfaces 2019 v.564 pp. 23-30
Escherichia coli, Fourier transform infrared spectroscopy, Staphylococcus aureus, X-ray diffraction, antibacterial properties, catalysts, ciprofloxacin, colloids, graphene oxide, irradiation, nanocomposites, nanoparticles, photocatalysis, photolysis, scanning electron microscopy, thermogravimetry, titanium dioxide, transmission electron microscopy, ultraviolet-visible spectroscopy
The reduced Graphene Oxide based titanium dioxide (rGO-TiO2) nanocomposite was synthesized by a simple hydrothermal preparation and characterized by X-ray Diffraction Analysis (XRD), UV–vis absorption spectroscopy (UV), Fourier Transform Infrared spectroscopy (FT-IR), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The XRD pattern of rGO-TiO2 indicates the presence of anatase TiO2 and average crystalline size of particles is 32 nm. The optical band gaps of TiO2, GO and rGO-TiO2 nanocomposite are 3.24 eV, 4.3 eV and 2.7 eV respectively. Comparison of efficiencies of three catalysts shows that ciprofloxacin degrades at a faster rate under visible light irradiation in the presence of rGO-TiO2 at 60 min than in presence of pure TiO2 and commercial TiO2-P25. Higher photocatalytic decomposition efficiency of rGO-TiO2 is explained by its reduced electron-hole recombination and visible light activity. The kinetics of photodecomposition reaction was analyzed. Antibacterial activity analysis of rGO-TiO2 nanoparticles reveals that it is more active against S. aureus than E. coli.