The Effect of Defects Created in Microporous Vanadosilicate AM-6 Thin Films in Photocatalysis

Kuzyaka, Duygu
Akata Kurç, Burcu
Micro and Nanotechnology Department, Middle East Technical University, Ankara, , Turkey The development of visible-light effective photocatalysts allows low cost degradation of toxic non-biodegradable organic pollutants. Vanadium, present in a specific oxidation state within the structure of SiO2 matrix could open up the gateway to investigate and tailor the defects created for such photocatalytic applications. Vanadosilicate AM-6, which is a large pore microporous material containing semiconducting monatomic …V-O-V-O-V… chains embedded in a silica matrix has recently been demonstrated to exhibit photocatalytic activity in the visible light range. Pore regularity, control of defects, and the presence of stoichiometric amounts of in AM-6 allows one to create alternative materials in visible-light photocatalysis. Accordingly, vanadosilicate AM-6 thin films with controlled defect sites were produced by tailoring the V5+/V4+ ratio within the thin film structure . Furthermore, the effect of changing molar composition and vanadium source used for the secondary growth was also investigated systematically. V5+/V4+ ratio was tailored systematically by controlling the defect concentration of seed crystals during the film growth and vanadium source with alternating V5+ concentration. It was found that vanadosilicate AM-6 films with higher amount of V5+ ions arising from different synthesis conditions possess better photocatalytic activity under visible light irradiation for the degradation of MB, which can be attributed to the presence of V5+ cation within the framework of AM-6. Photocatalyst production in the form of thin film provides integration of the material to device-oriented applications and also accelerates the degradation kinetics between the pollutant and the photocatalyst due to the controlled defect formation leading to enhanced photocatalytic activity under visible light.
2018 MRS (Materials Research Society) Fall Meeting, (25 - 30 November 2018)


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Citation Formats
D. Kuzyaka and B. Akata Kurç, “The Effect of Defects Created in Microporous Vanadosilicate AM-6 Thin Films in Photocatalysis,” presented at the 2018 MRS (Materials Research Society) Fall Meeting, (25 - 30 November 2018), Boston, Massachusetts, 2018, Accessed: 00, 2021. [Online]. Available: