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Study on the Photocatalytic Activity of pn Junction Photocatalyst Cu2O/TiO2

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pn junction photocatalyst Cu2O/TiO2 was prepared by ball milling through doping Cu2O into TiO2 and using H2O solution as disperser. The pn junction photocatalyst Cu2O/TiO2 was characterized by UV-Vis diffuse reflection spectrum, Scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the photocatalyst was evaluated by photocatalytic reduction of Cr2O2−7 and photocatalytic oxidation of methyl orange (MO), respectively. The results showed that, for the photocatalytic reduction of Cr2O2−7, the optimum percentage of doped-Cu2O is 1.0% (weight percentage). The photoreduction activity of the pn junction Cu2O/TiO2 is much higher than that of TiO2 on the photocatalytic reduction of Cr2O2−7. However, the photooxidation activity of the pn junction photocatalyst Cu2O/TiO2 is much lower than that of TiO2 on the photocatalytic oxidation of methyl orange (MO). Namely, the pn junction photocatalyst Cu2O/TiO2 has higher photocatalytic reduction activity, but lower photocatalytic oxidation activity. Cu2O and TiO2 were coupled highly, forming the pn junction Cu2O/TiO2 photocatalyst. The photocatalytic activity of the pn junction Cu2O/TiO2 was discussed by the pn junction principle. Effect of ball milling time on the photocatalytic activity of pn junction photocatalyst Cu2O/TiO2 was also investigated.
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Keywords: ACTIVITY; BALL MILLING; CHARACTERIZATION; CU2O/TIO2; P-N JUNCTION; PHOTOCATALYST

Document Type: Research Article

Publication date: 2009-07-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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