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Visible light activated photo-catalytic effect and local structure of iron silicate glass prepared by sol-gel method |
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| Authors: | Yusuke Takahashi Shiro Kubuki Kazuhiko Akiyama Katalin Sinkó Ernő Kuzmann Zoltán Homonnay Mira Ristić Tetsuaki Nishida |
| Affiliation: | 1. Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachi-Oji, Tokyo, 192-0397, Japan 2. Institute of Chemistry, Faculty of Science, E?tv?s University, Pázmány P.s. 1/A, Budapest, 1117, Hungary 3. Laboratory of Nuclear Chemistry, Institute of Chemistry, E?tv?s Loránd University, Pázmany P. s., 1/A, Budapest, 1117, Hungary 4. Division of Materials Chemistry, Ru?er Bo?kovi? Institute, P.O.Box 180, Zagreb, 10002, Croatia 5. Department of Biological and Environmental Chemistry, Faculty of Humanity-Oriented Science and Engineering, Kinki University, Kayanomori 11-6, Iizuka, Fukuoka, 820-8555, Japan |
| Abstract: | A relationship between methylene blue (MB) decomposition ability under visible light and local structure of xFe2O3·(100-x)SiO2 glass abbreviated as xFS prepared by sol-gel method was investigated by 57Fe-Mössbauer spectroscopy, X-ray diffractometry (XRD) and ultraviolet-visible light absorption spectroscopy (UV-Vis). Mössbauer spectra of xFS glass with x of 10, 30 and 50 annealed at 1000 °C for 3 h were mainly composed of a paramagnetic doublet due to fayalite (Fe2SiO4), and magnetic sextets due to magnetite (Fe3O4) or hematite (α-Fe2O3). The absorption area (A) of α-Fe2O3 gradually increased from 0.0 to 10.3 and 100 % with the increasing Fe2O3 content (x) of annealed xFS glass. A leaching test performed by 20 mL of MB aqueous solution and 40 mg of annealed 50FS glass showed that MB concentration decreased from 16.2 to 4.7 μmol L?1 after 2 h with the first order rate constant of 1.8 × 10?4 s?1. These results prove that annealed iron silicate glass containing α-Fe2O3 can decompose MB effectively under visible light irradiation. |
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