The effect of microporous vanadosilicate AM-6 thin films as photocatalysts for the degradation of methylene blue

Date

2018-11-01

Author

Kuzyaka, Duygu
Galioglu, Sezin
ALTIN, İLKNUR
Sokmen, Munevver
Akata Kurç, Burcu

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

217
views

0
downloads

In the current study, a new photocatalyst in thin film form exhibiting photocatalytic activity under visible light range was introduced. For that purpose, microporous vanadosilicate (AM-6, (Na,K)(2)VSi5O13) and silver nanoparticle (Ag-0) incorporated vanadosilicate AM-6 thin films were investigated as photocatalysts for the photocatalytic decomposition of methylene blue (MB). To create different oxidation states of vanadium cation present in the center dot center dot center dot V-o-V-o-V center dot center dot center dot quantum wires within the framework of AM-6, two different molar compositions were used for thin film formation of vanadosilicate AM-6. The vanadosilicate AM-6 thin films demonstrated photocatalytic activity under ultraviolet (UV) and visible light irradiation. The microporous titanosilicate (ETS-10, (Na.K)(2)TiSi5O13) thin films, isomorph of vanadosilicate AM-6, were also used as photocatalysts for the degradation of MB for the comparison of photocatalytic effectiveness. When visible light irradiation is used for the photocatalytic decomposition of MB, the photocatalytic activity of AM-6 was significantly different with respect to ETS-10. The narrower band gap of AM-6 with respect to the band gap of ETS-10 and the presence of V5+ cations in the structure of AM-6 provided photocatalytic activity under visible light irradiation. It was found that, vanadosilicate AM-6 films with higher amount of V5+ ions possess better photocatalytic activity under visible light irradiation for the degradation of MB, which can be attributed to the presence of V5+ cations within the framework of AM-6. The presence of both V4+ and V5+ cations was characterized by XPS and Raman spectroscopy in the vanadosilicate AM-6 thin films. To enhance the photocatalytic activity of AM 6 thin films, Na+ and K+ ions of the as-synthesized AM-6 thin films were ion-exchanged with Ag+ ions and then reduced to Ag-0 nanoparticles (NP) by using sodium borohydride (NaBH4) solution. The results showed that Ag-0 NP incorporated AM-6 thin films showed an increased photocatalytic activity due to various reasons such as the role of metal nanoparticles as electron traps, surface plasmon resonance effect, and band-gap narrowing.

Subject Keywords

Photocatalysis, AM-6, Vanadosilicates, Thin films, Zeo-type materials

URI

https://hdl.handle.net/11511/31705

Journal

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY

DOI

https://doi.org/10.1016/j.jphotochem.2018.03.041

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

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 (2021-08-01) 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 t...
The Effect of Thickness and Doping on the Nonlinear Absorption Behaviour of IIIA-VIA Group Amorphous Semiconductor Thin Films Kurum, Ulas; YAĞLIOĞLU, HALİME GÜL; YÜKSEK, MUSTAFA; ELMALI, Ayhan; Ates, Aytunc; KARABULUT, MEVLÜT; Mamedov, Gasan M.; Hasanlı, Nızamı (2011-06-30) The nonlinear optical absorption of InSe, GaSe and GaxIn1-xSe amorphous films with varying thickness and doping has been studied by open-aperture Z-scan experiment with 4 ns and 65 ps pulse durations at 1064 nm wavelength and femtosecond pump-probe spectroscopy. Our results show that the dopant and film thickness (from 20 nm to 104 nm) results in switching from saturable absorption to nonlinear absorption for equal input intensities. This behaviour is attributed to increasing localized defect states with in...
Numerical and experimental investigation on laser damage threshold of highly reflective multilayer thin films Ocak, Mustafa; Sert, Cüneyt; Okutucu Özyurt, Hanife Tuba; Department of Mechanical Engineering (2016) The laser induced temperature distributions on the optical thin films are investigated in this study. Effects of optical design modifications on thermal performance of highly reflective (HR) multilayer thin films are analyzed. Firstly, a conventional 19 layer HR coating is selected as a reference and the laser induced temperature distribution is evaluated on it. Then, alternative HR designs are developed by employing non-quarter wave layers, over coat (OC) layers and two high index materials in the coating ...
Enhancement of electrical conductivity of plasma polymerized fluorene-type thin film under iodine and chlorine dopants MANSUROGLU, Dogan; Uzun Kaymak, İlker Ümit (2017-08-31) Electrical and optical properties of plasma-polymerized fluorene-type (C13H10) iodine-and chlorine-doped thin films are investigated. Fluorene-type thin films are produced using a mixture of biphenyl (C12H10) and methane (CH4) inside a single capacitively coupled radio frequency plasma system. The dopants are mixed with the plasmadirectly as vapor during the deposition. The chemical structures of the generated functional compounds, evaluated by a Fourier transform infrared spectroscopy, exhibit a changeable...
THE GROWTH OF SNSBSE2 CRYSTAL AND THE INVESTIGATION OF PHYSICAL PROPERTIES OF THERMALLY EVAPORATED SNSBSE2 THIN FILMS Bektaş, Tunç; Parlak, Mehmet; Erçelebi, Ayşe Çiğdem; Department of Physics (2022-2) The aim of this study is to characterize the structural, optical and electrical proper ties of both SnSbSe bulk crystal and SnSbSe thin films. For this purpose, SnSbSe crystal were grown and SnSbSe thin film were deposited on glass substrates by using vertical Bridgman and thermal evaporation methods respectively. For SnSbSe bulk crystal, Energy Dispersive X-Ray, Scanning Electron Microscopy, X-Ray Diffrac tion and Raman measurement were performed to investigate the structural analysis. Also, spectroscopic ...

Citation Formats

D. Kuzyaka, S. Galioglu, İ. ALTIN, M. Sokmen, and B. Akata Kurç, “The effect of microporous vanadosilicate AM-6 thin films as photocatalysts for the degradation of methylene blue,” JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, pp. 127–135, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31705.