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Bifunctional g-C<sub>3</sub>N<sub>4</sub>/WO<sub>3</sub> Thin Films for Photocatalytic Water Purification
oleh: Maria Antoniadou, Michalis K. Arfanis, Islam Ibrahim, Polycarpos Falaras
Format: | Article |
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Diterbitkan: | MDPI AG 2019-11-01 |
Deskripsi
A bifunctional thin film photocatalyst consisting of graphitic carbon nitride on tungsten trioxide (g-C<sub>3</sub>N<sub>4</sub>/WO<sub>3</sub>) 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 WO<sub>3</sub> 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<sup>+6</sup> 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<sup>+6</sup> 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.