Combinatorial doping of TiO2with platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni) to achieve enhanced photocatalytic activity with visible light irradiation

来自 Cambridge Univ Press

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105

作者：

J Choi，H Park，MR Hoffmann

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摘要：

Titanium dioxide (TiO2) was doped with the combination of several metal ions including platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni). The doped TiO2 materials were synthesized by standard sol-gel methods with doping levels of 0.1 to 0.5 at.%. The resulting materials were characterized by x-ray diffraction (XRD), BET surface-area measurement, scanning electron microscopy (SEM), and UV-vis diffuse reflectance spectroscopy (DRS). The visible light photocatalytic activity of the codoped samples was quantified by measuring the rate of the oxidation of iodide, the rate of degradation of methylene blue (MB), and the rate of oxidation of phenol in aqueous solutions at > 400 nm. 0.3 at.% Pt-Cr-TiO2 and 0.3 at.% Cr-V-TiO2 showed the highest visible light photocatalytic activity with respect to MB degradation and iodide oxidation, respectively. However, none of the codoped TiO2 samples were found to have enhanced photocatalytic activity for phenol degradation when compared to their single-doped TiO2 counterparts.

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关键词：

Experimental/ catalysis chromium doping nickel organic compounds oxidation photochemistry platinum radiation chemistry sol-gel processing titanium compounds ultraviolet spectra vanadium visible spectra X-ray diffraction/ TiO 2 combinatorial doping platinum chromium vanadium nickel enhanced photocatalytic activity visible light irradiation titanium dioxide metal ions standard sol-gel methods X-ray diffraction BET surface-area measurement scanning electron microscopy UV-vis diffuse reflectance spectroscopy visible light photocatalytic activity iodide oxidation methylene blue degradation phenol aqueous solutions TiO 2:Pt TiO 2:Cr TiO 2:V TiO 2:Ni / A6170T Doping and implantation of impurities A8250F Photolysis and photodissociation by IR, UV and visible radiation A8230V Homogeneous catalysis A7840 Visible and ultraviolet spectra (condensed matter)/ TiO2:Pt/ss TiO2/ss O2/ss Pt/ss Ti/ss O/ss TiO2/bin O2/bin Ti/bin O/bin Pt/el Pt/dop TiO2:Cr/ss TiO2/ss O2/ss Cr/ss Ti/ss O/ss