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Composites of Laminar Nanostructured ZnO and VOx-Nanotubes Hybrid as Visible Light Active Photocatalysts

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Departamento de Química, Universidad Tecnológica Metropolitana, P.O. Box 9845, Santiago, Chile
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Department of Chemistry, Faculty of Sciences, Universidad de Chile, P.O. Box 653, Santiago, Chile
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Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB Bellaterra, 08193 Barcelona, Spain
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ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
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Center for the Development of Nanoscience and Nanotechnology, CEDENNA, Av. Ecuador 3493, Santiago, Chile
*
Author to whom correspondence should be addressed.
Catalysts 2018, 8(2), 93; https://doi.org/10.3390/catal8020093
Received: 15 January 2018 / Revised: 9 February 2018 / Accepted: 15 February 2018 / Published: 24 February 2018
A series of hybrid heterostructured nanocomposites of ZnO with V2O5 nanotubes (VOx-NTs) in different mixing ratios were synthesized, with the aim of reducing the recombination of photoinduced charge carriers and to optimize the absorption of visible light. The study was focused on the use of heterostructured semiconductors that can extend light absorption to the visible range and enhance the photocatalytic performance of ZnO in the degradation of methylene blue as a model pollutant. The addition of VOx-NTs in the synthesis mixture led to a remarkable performance in the degradation of the model dye, with hybrid ZnO (stearic acid)/VOx-NTs at a ratio of 1:0.06 possessing the highest photocatalytic activity, about seven times faster than pristine zinc oxide. Diffuse reflectance spectroscopic measurements and experiments in the presence of different trapping elements allowed us to draw conclusions regarding the band positions and photocatalytic degradation mechanism. The photocatalytic activity measured in three subsequent cycles showed good reusability as no significant loss in efficiency of dye degradation was observed. View Full-Text
Keywords: ZnO nanocomposites; VOx nanotubes; visible light photocatalyst; methylene blue degradation ZnO nanocomposites; VOx nanotubes; visible light photocatalyst; methylene blue degradation
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MDPI and ACS Style

Benavente, E.; Navas, D.; Devis, S.; Segovia, M.; Sotomayor-Torres, C.; González, G. Composites of Laminar Nanostructured ZnO and VOx-Nanotubes Hybrid as Visible Light Active Photocatalysts. Catalysts 2018, 8, 93.

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