Visible-light photocatalytic degradation of ethidium bromide using carbon- and iron-modified TiO2 photocatalyst
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Nanosized TiO2 as well as carbon (C) and C, Fe co-doped TiO2 were synthesized using reverse microemulsion method. Thermal stability of precursor was studied using thermogravimetry and differential thermal analysis techniques. Heat-treated powders were characterized using Fourier transform infrared spectrophotometer, X-ray diffractometer, scanning electron microscope, transmission electron microscope and energy-dispersive X-ray spectroscope. Visible-light photocatalytic degradation of aqueous solution of ethidium bromide (EtBr) was investigated using C, Fe co-doped TiO2 photocatalyst. UV–visible spectrophotometer and high-pressure liquid chromatography techniques were used to analyze the concentration of EtBr during the degradation process. Various parameters affecting the photocatalytic activity of photocatalyst are studied. C-doped TiO2 acts as photosensitizer and helps to extend the light absorption wavelength of C-doped TiO2.·Fe co-doping introduces new energy levels of the transition metal ions between the band gap of TiO2 and further extends absorption wavelength in visible region. The synergistic effects of C- and Fe-modified TiO2 nanoparticles were responsible for improving visible-light photocatalytic activity.
KeywordsVisible light Microemulsion Malachite green C, Fe co-doped TiO2
Author Lavand A. B. is thankful to UGC, New Delhi, India, for providing BSR fellowship. Authors are also thankful to Sophisticated Analytical Instrument Laboratory (SAIF) IIT, Mumbai, India, for availing FE-SEM and TEM facilities.
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