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Ag-CuO-ZnO Metal-semiconductor Multiconcentric Nanotubes for Superior and Perdurable Photodegradation

Abstract

Solar energy represents a robust and natural form of resource for environment remediation via photocatalytic pollutant degradation with minimum associated cost. However, due to the complexity of photodegradation process, it is a long-standing challenge to develop reliable photocatalytic systems with low recombination rate, excellent recyclability, and high utilization rate of solar energy, especially in visible light range. In this work, a ternary hetero-nanostructured Ag-CuO-ZnO nanotubes (NTs) composite is fabricated via facile and low-temperature chemical and photochemical deposition methods. Under visible light irradiation, the as-synthesized ZnO NTs based ternary composite exhibits a greater enhancement (~300 %) of photocatalytic activity than its counterpart Ag-CuO-ZnO nanorods (NRs) in the pollutant degradation. The enhanced photocatalytic capability is primarily attributed to the intensified visible light harvesting, efficient charge carrier separation as well as much larger surface area. Furthermore, our as-synthetic hybrid ternary Ag-CuO-ZnO NTs composite demonstrates much higher photostability and maintains ~98% of degradation efficiency even after 20 usage cycles, which can be mainly ascribed to the highly stable polar planes of ZnO NTs than those of ZnO NRs. These results afford a new route to construct ternary heterostructured composites with perdurable performance in sewage treatment and photocorrosion suppression.

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Publication details

The article was received on 09 May 2017, accepted on 08 Jul 2017 and first published on 14 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR03279J
Citation: Nanoscale, 2017, Accepted Manuscript
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    Ag-CuO-ZnO Metal-semiconductor Multiconcentric Nanotubes for Superior and Perdurable Photodegradation

    K. Xu, J. Wu, C. F. Tan, G. W. W. Ho, A. Wei and M. Hong, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03279J

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