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Enhanced photocatalytic activity of ZnO–graphene nanocomposites prepared by microwave synthesis

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Abstract

This work reports a simple one-step synthesis of ZnO nanopyramids supported on reduced graphene oxide (RGO) nanosheets using microwave irradiation (MWI) of zinc acetate and GO in the presence of a mixture of oleic acid and oleylamine. The rapid decomposition of zinc acetate by MWI in the presence of the mixture of oleic acid and oleylamine results in the formation of hexagonal ZnO nanopyramids. GO has a high affinity for absorbing MWI, which results in a high local heating effect around the GO nanosheets and facilitates the reduction of GO by the oleylamine. The RGO nanosheets act as heterogeneous surface sites for the nucleation and growth of the ZnO nanopyramids. Using ligand exchange, the ZnO–RGO nanocomposites can be dispersed in an aqueous medium, thus allowing their use as photocatalysts for the degradation of the malachite green dye in water. The ZnO–RGO nanocomposites show enhanced photocatalytic activity for the degradation of the dye over the unsupported ZnO nanopyramids. The enhanced activity is attributed to efficient charge transfer of the photogenerated electrons in the conduction band of ZnO to graphene. This enhances the oxidative pathway of the holes generated in the valence band of ZnO which can effectively lead to the degradation and mineralization of the malachite green. The ZnO nanopyramids supported on RGO could have improved performance in other photocatalytic reactions and also in solar energy conversion.

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Acknowledgments

We thank the National Science Foundation (CHE-0911146, OISE-1002970 and CHE-0922582) for the support of this work.

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Authors and Affiliations

  1. Department of Chemistry, Virginia Commonwealth University, Richmond, VA, 23284, USA

    Natalie P. Herring, Serial H. Almahoudi, Chelsea R. Olson & M. Samy El-Shall

  2. Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Kingdom of Saudi Arabia

    M. Samy El-Shall

Authors
  1. Natalie P. Herring
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  2. Serial H. Almahoudi
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  3. Chelsea R. Olson
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  4. M. Samy El-Shall
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Correspondence to M. Samy El-Shall.

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This article is part of the topical collection on nanomaterials in energy, health and environment

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Herring, N.P., Almahoudi, S.H., Olson, C.R. et al. Enhanced photocatalytic activity of ZnO–graphene nanocomposites prepared by microwave synthesis. J Nanopart Res 14, 1277 (2012). https://doi.org/10.1007/s11051-012-1277-7

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