Efficient photocatalytic degradation of methylene blue by heterostructured ZnO-RGO/RuO2 nanocomposite under the simulated sunlight irradiation

D. Amaranatha Reddy, Rory Ma, Tae Kyu Kim

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Abstract

We report an ZnO-RuO2/RGO ternary nanocomposite synthesized via a hydrothermal method combined with a homogeneous precipitation method. Morphological and elemental analysis demonstrates that ZnO nanosheets were anchored on the graphene nanosheets surrounded by RuO2 nanoparticles. The ZnO-RGO/RuO2 nanocomposites possessed the extended light absorption range and show remarkably enhanced photocatalytic activity toward methylene blue (MB) under the simulated sunlight irradiation as compared to bare-ZnO and the optimum binary ZnO-RGO and ZnO-RuO2 nanocomposites. We have observed complete degradation of MB in 180, 150, 90, and 60 min for ZnO, ZnO-RuO2, ZnO-RGO, and ZnO-RGO/RuO2 nanocomposites respectively. The enhanced photocatalytic performance in ZnO-RGO/RuO2 is ascribed to increased light absorption and efficient charge separation of the photogenerated carriers and that it prolonged the lifetime of the electron-hole pairs due to the chemical bonding between ZnO, RuO2 and graphene nanosheets. In addition to the excellent photocatalytic degradation properties, the synthesized samples also exhibited a strong yellow emission, which implies that these nanocomposites may find application as yellow components in near UV-white LEDs. These attractive features make the ZnO-RuO2/RGO nanocomposite a promising recoverable photocatalyst for practical use in wastewater treatment and fabrication of near UV-white LEDs.

Original languageEnglish
Pages (from-to)6999-7009
Number of pages11
JournalCeramics International
Volume41
Issue number5
DOIs
Publication statusPublished - 2015 Jun 1

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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