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Registered conference abstracts

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Registered contributions

Total number of registered contributions: 2

Registered talks

  1. Water purification and characterization of iron-aluminosilicate glass prepared by Sol-gel method
    Author(s): Irfan Khan, I. Khan et al.
    Institution: Tokyo Metropolitan University, Tokyo
    Abstract: Iron-containing silicate glass can be a good candidate for effective water purification. Hematite (α-Fe2O3) is a suitable material, due to its photocatalytic properties and low band gap energy [1]. In our previous study, precipitated α-Fe2O3 could be detected from the 57Fe-Mössbauer spectra of iron-containing silicate glass prepared by the sol-gel method [2] and melt-quenching method [3]. It showed a high rate constant of 2.87×10-2 h-1 [3] for methylene blue (MB) decomposition under visible light. In this study, we report the water purification ability and electronic conductivity of iron containing aluminosilicate glass with the composition of 40Fe2O3 • yAl2O3 • (60 – y ) SiO2 (in mass%, y = 0, 10, 15 and 20), abbreviated as 40FyAS. The samples prepared by the sol-gel method and subsequent calcination of the obtained dried gels at 1000 oC for 100 min were investigated by means of Low-temperature 57Fe-Mössbauer spectroscopy, TG-DTA, FT-IR, TEM, Impedance spectroscopy, and ultraviolet-visible light absorption spectroscopy (UV-VIS). The 57Fe-Mössbauer spectrum of 40FyAS glass was composed of two different doublets due to fayalite with constant isomer shift (IS) of 1.26 mm s-1 and quadrupole splitting (QS) of 2.97 mm s-1, Fe+3 (Td) with increasing IS from 0.19 to 0.32 mm s-1 and increasing QS from 0.48 to 1.09 mm s-1 as well as three magnetic sextets ascribed to a regular hematite (α-Fe2O3: IS= 0.46, QS= 0.16 mm s-1) and the remaining two belonging to the A and B sites of magnetite. From wastewater degradation test, a decrease in the concentration from 285.6 to 45.2 mg L-1 was observed after 7 days when it was mixed with the 40F20AS under visible-light irradiation and yield the highest first-order rate constant of 23.7×10-2 day-1. DC conductivity results revealed that conductivity increases as alumina content increases. It is concluded that precipitation of α-Fe2O3 and the introduction of Al2O3 in the SiO2 matrix are essential for enhancing the visible light photocatalytic activity and electrical conductivity. [1] H. Zhang et al., J Mater Chem A, 4 (2014) 1421-1426. [2] Y. Takahashi et al., Hyperfine Interact. 226 (2014) 747–753. [3] S. Kubuki et al., J. Radioanal. Nucl. Chem. 301(1) (2014) 1-7.
    Author(s): Shiro Kubuki, Ahmed Salah Ali, et al
    Institution: Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachi-Oji, Tokyo 192-0397, Japan
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