Journal of Materials Research

Articles

Combinatorial doping of TiO2 with platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni) to achieve enhanced photocatalytic activity with visible light irradiation

Jina Choia1, Hyunwoong Parka2 and Michael R. Hoffmanna3 c1

a1 W.M. Keck Laboratories, California Institute of Technology, Pasadena, California 91125

a2 School of Physics and Energy Science, Kyungpook National University, Daegu 702-701, South Korea

a3 W.M. Keck Laboratories, California Institute of Technology, Pasadena, California 91125

Abstract

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 λ > 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.

(Received May 19 2009)

(Accepted July 02 2009)

Key Words:

  • Colloid;
  • Dopant;
  • Semiconducting

Correspondence:

c1 Address all correspondence to this author. e-mail: mrh@caltech.edu

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