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Open AccessFeature PaperArticle

Bifunctional g-C3N4/WO3 Thin Films for Photocatalytic Water Purification

Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, 15341 Agia Paraskevi, Athens, Greece
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Water 2019, 11(12), 2439; https://doi.org/10.3390/w11122439
Received: 30 October 2019 / Revised: 19 November 2019 / Accepted: 19 November 2019 / Published: 21 November 2019
(This article belongs to the Special Issue Advances in Water and Wastewater Monitoring and Treatment Technology)
A bifunctional thin film photocatalyst consisting of graphitic carbon nitride on tungsten trioxide (g-C3N4/WO3) is introduced for the improvement of photocatalytic activity concerning hexavalent chromium reduction and methylene blue dye removal in water, compared to the bare, widely used WO3 semiconductor. A bilayered structure was formed, which is important for the enhancement of the charge carriers’ separation. The characterization of morphological, structural, optoelectronic, and vibrational properties of the photocatalysts permitted a better understanding of their photocatalytic activity for both dye degradation and Cr+6 elimination in water and the analysis of the photocatalytic kinetics permitted the determination of the corresponding pseudo-first-order reaction constants (k). Trapping experiments performed under UV illumination revealed that the main active species for the photocatalytic reduction of Cr+6 ions are electrons, whereas in the case of methylene blue azo-dye (MB) oxidation, the activation of the corresponding photocatalytic degradation comes via both holes and superoxide radicals. View Full-Text
Keywords: tungsten oxide; graphitic carbon nitride; photocatalysis; methylene blue; hexavalent chromium tungsten oxide; graphitic carbon nitride; photocatalysis; methylene blue; hexavalent chromium
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MDPI and ACS Style

Antoniadou, M.; Arfanis, M.K.; Ibrahim, I.; Falaras, P. Bifunctional g-C3N4/WO3 Thin Films for Photocatalytic Water Purification. Water 2019, 11, 2439.

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