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

Author:
Raja, A., Selvakumar, K., Rajasekaran, P., Arunpandian, M., Ashokkumar, S., Kaviyarasu, K., Asath Bahadur, S., Swaminathan, M.
Source:
Colloids and surfaces 2019 v.564 pp. 23-30
ISSN:
0927-7757
Subject:
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
Abstract:
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.
Agid:
6265709