Microporous vanadosilicate films with tailorable V4+/V5+ ratio to achieve enhanced visible-light photocatalysis

Kuzyaka, Duygu
Uzun, Ceren
Yıldız, İlker
Kaya, Murat
Akata Kurç, Burcu
This study investigates the changes induced into the photocatalytic activity under solar light irradiation upon changing the structural film properties and tailor the concentration of defects in microporous vanadosilicate AM-6 films. For this purpose, the preparation of AM-6 films with different V4+/V5+ ratios and their utilization as photocatalysts for the decomposition of MB were carried out. Two approaches were used for obtaining AM-6 films with different V4+/V5+ ratios: altering the seed layer coating technique and altering the molar water content of the secondary growth gel. It was seen that dip coating method resulted in an increase in the thickness of the films and it was presumed that the adsorption of MB by AM-6 films was the predominant factor in photocatalytic activity. The second approach of increasing the molar water content of the secondary growth gel provided an increase in the defect concentration resulting in an enhanced photocatalytic activity under the solar light. In the current study, the defect concentration of the prepared films was determined by using XPS and Raman spectroscopy techniques. Accordingly, it was determined that the samples with lower amount V4+/V5+ ratio showed better photocatalytic activity under the solar light irradiation indicating that V5+ cations are responsible for the photocatalytic activity under visible light irradiation. This work provides methods of production of microporous films showing photocatalytic activity under visible light without the requirement of any post-synthesis treatments.
Microporous and Mesoporous Materials


Microporous vanadosilicate AM-6 films for photocatalytic applications
Kuzyaka, Duygu; Akata Kurç, Burcu; Department of Micro and Nanotechnology (2019)
There is an increasing attention on the photocatalysis experimentations providing removal of organic contaminants from water under visible and UV radiation. The role of semiconductor materials as photocatalysts is to degrade highly toxic pollutants. Pore regularity, control of defects, and the presence of stoichiometric amounts of vanadium in the silicate framework allows one to create alternative materials in advanced applications such as photocatalysis. Vanadium, present in specific form within the struct...
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Citation Formats
D. Kuzyaka, C. Uzun, İ. Yıldız, M. Kaya, and B. Akata Kurç, “Microporous vanadosilicate films with tailorable V4+/V5+ ratio to achieve enhanced visible-light photocatalysis,” Microporous and Mesoporous Materials, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85108858367&origin=inward.