NDLI: Visible light activated catalytic effect of iron containing soda-lime silicate glass characterized by $^{57}$Fe-Mössbauer spectroscopy

Content Provider	Springer Nature Link
Author	Kubuki, Shiro Iwanuma, Jun Takahashi, Yusuke Akiyama, Kazuhiko Homonnay, Zoltán Sinkó, Katalin Kuzmann, Ernő Nishida, Tetsuaki
Copyright Year	2014
Abstract	A relationship between local structure and visible light activated catalytic effect of iron containing soda lime silicate glass with the composition of 15Na$_{2}$O·15CaO·xFe$_{2}$O$_{3}$·(70-x)SiO$_{2}$, x = 5–50 mass %, abbreviated as NCFSx was investigated by means of $^{57}$Fe-Mössbauer spectroscopy, X-ray diffractometry (XRD), small angle X-ray scattering (SAXS), electrospray ionization mass spectrometry (ESI–MS) and ultraviolet–visible light absorption spectroscopy (UV–Vis). Mössbauer spectra of NCFSx glass with ‘x’ being equal to or larger than 30 after isothermal annealing at 1,000 °C for 100 min consisted of a paramagnetic doublet and a magnetic sextet. The former had isomer shift (δ) of 0.24 mm s$^{−1}$ and quadrupole splitting (Δ) of 0.99 mm s$^{−1}$ due to distorted Fe$^{III}$O$_{4}$ tetrahedra, and the latter had δ of 0.36 mm s$^{−1}$ and internal magnetic field (H $_{int}$) of 51.8 T due to hematite (α-Fe$_{2}$O$_{3}$). The absorption area (A) of α-Fe$_{2}$O$_{3}$ varied from 47.2 to 75.9, 93.1, 64.8 and 47.9 % with ‘x’ from 30 to 35, 40, 45 and 50, indicating that the amount of precipitated α-Fe$_{2}$O$_{3}$ varied with the Fe$_{2}$O$_{3}$ content of NCFSx glass. The precipitation of α-Fe$_{2}$O$_{3}$ was also confirmed by XRD study of annealed NCFS glass with ‘x’ larger than 30. A relaxed sexted with δ, H $_{int}$ and Γ of 0.34 mm s$^{−1}$ and 37.9 T and 1.32 mm s$^{−1}$ was observed from the Mössbauer spectra of annealed NCFSx glass with ‘x’ of 45 and 50, implying that the precipitation of non-stoichiometric iron hydroxide oxide with the composition of Fe$_{1.833}$(OH)$_{0.5}$O$_{2.5}$ having the similar structure of α-Fe$_{2}$O$_{3}$ and α-FeOOH. A remarkable decrease in the concentration of methylene blue (MB) from 10 to 0.0 μmol L$^{−1}$ with the first-order rate constant (k) of 2.87 × 10$^{−2}$ h$^{−1}$ was observed for 10-day leaching test using annealed NCFS50 glass under visible light irradiation. ESI–MS study indicated that existence of fragments with m/z value of 129, 117 and 207 etc. originating from MB having m/z of 284. This result evidently showed that the MB concentration decreased due to visible light induced decomposition caused by the visible light activated catalytic effect of α-Fe$_{2}$O$_{3}$ and/or Fe$_{1.833}$(OH)$_{0.5}$O$_{2.5}$ precipitated in soda-lime silicate glass matrix.
Starting Page	1
Ending Page	7
Page Count	7
File Format	PDF
ISSN	02365731
Journal	Journal of Radioanalytical and Nuclear Chemistry
Volume Number	301
Issue Number	1
e-ISSN	15882780
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-03-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Iron containing soda-lime silicate glass Hematite Visible light activated photo catalyst $^{57}$Fe-Mössbauer spectroscopy Nuclear Chemistry Physical Chemistry Nuclear Physics, Heavy Ions, Hadrons Diagnostic Radiology Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Pollution Health, Toxicology and Mutagenesis Radiology, Nuclear Medicine and Imaging Analytical Chemistry Public Health, Environmental and Occupational Health Nuclear Energy and Engineering

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