Vahid Jabbari - Photocatalyst Cr-doped titanium oxide nanoparticles: Fabrication, characterization, and investigation of the effect of doping on methyl orange dye degradation

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  Publication Details (including relevant citation   information):

  Materials Science in Semiconductor Processing 21, 161-166


  The Cr/TiO2 nanoparticles were synthesized via sol–gel   technique by using tetraisopropylorthotitanate (TIPOT) and   chromium nitrate (Cr(NO3)3·9H2O)   as precursors. The framework substitution of Cr into   TiO2 nanoparticles was evaluated by X-ray diffraction   (XRD), scanning electron microscopy equipped with energy   dispersive X-ray microanalysis (SEM-EDX), transmission electron   microscopy (TEM) and Fourier transform infrared (FT-IR)   techniques. XRD results showed that pure TiO2 and   Cr/TiO2 nanoparticles own anatase phase with some   rutile phase. SEM and TEM images confirmed the successful doping   of Cr3+ ions into TiO2 structure. The   result of photocatalytic degradation of methyl orange (MO)   demonstrated that appropriate Cr3+ doping can greatly   enhance photocatalytic activity of TiO2, which was   attributed to the "red-shift" in ultraviolet–visible light   (UV–vis) absorption spectra of TiO2 nanoparticles   while doped with Cr3+ ions and also to the improved   transfer efficiency of photogenerated electrons and holes caused   by incorporation of Cr3+ ions. The optimal   Cr3+ concentration to obtain the highest   photocatalytic activity was 5% mol. The relatively high   photocatalytic activity of Cr/TiO2 nanoparticles,   suggests that it may have a promising future for water and   wastewater purifications.

  Address (URL): doi:10.1016/j.mssp.2013.12.024