article posted 7 April 2016
Shiro KubukiGraduated at Kyshu University (Fukuoka, Japan) in 1997 studying material science, focusing on a relationship between local structure and infrared light transmittance of aluminate and gallate glasses. After obtaining a PhD degree in science, he has investigated several functional glasses such as conductive vanadate, photocatalytic silicate by applying 57Fe- and 119Sn-Mössbauer spectroscopies. Please check the list of papers and conference presentations.
Mössbauer study of photocatalytic iron alumino-sililcate glass and its possibilities of preparation from waste slag
Shiro Kubuki, Kosuke Sunakawa, Balazs Kobzi, Yusuke Iida, Erno Kuzmann*, Zoltán Homonnay* & Tetsuaki Nishida**
Graduate School of Science and Engineering, Tokyo Metropolitan University. Minami-Osawa 1-1, Hachi-Oji, 192-0397, JAPAN
The relationship between visible light photocatalytic ability and structure of iron-containing silicate glass with the composition of 15Na2
glass (abbreviated as x
<50 mass%) was investigated by 57
Fe-Mössbauer spectroscopy and methylene blue degradation test. 57
Fe-Mössbauer spectrum of x
NCFS glass with ‘x’ of 50 heat treated at 1000°C for 100 min composed of a paramagnetic doublet with the isomer shift (delta) of 0·24 mm s-1
and quadrupole splitting (Delta) of 0·99 mm s-1
due to distorted FeIII
tetrahedra, and a magnetic sextet with a delta of 0·36 mm s-1
and internal magnetic field (Hint) of 51·8 T due to hematite . A remarkable decrease in MB from 10 µm to 0·0 µmol with the rate constant (k
) of 2·87×10-2
was observed for the degradation test using heat-treated 50NCFS glass under visible light irradiation . On the other hand, the larger k
value of 9·26×10-2
was estimated for heat-treated iron alumino-silicate glass with the composition of 15Na2
(abbreviated as yNCFAS, 0<y
<20 mass%) , indicating that the iron silicate enhances the photocatalytic activity by introduction of Al2
. As a result of elemental analysis, waste slag exhausted from a household garbage combustion plant of Tokyo consisted of SiO2
(23·3%), CaO (21·8%), Al2
O (6·57%), etc. These results imply that the discarded waste slag can be recycled as a visible light activated photocatalyst by slightly modifying the chemical components.
Figure 1. MB degradation test using heat-treated 11NSFAS
 S. Kubuki, J. Iwanuma, Y. Takahashi, K. Akiyama, Z. Homonnay, K. Sinkó, E. Kuzmann, T. Nishida, J. Radioanal. Nucl. Chem
(1), 1-7 (2014).
 Y. Iida, K. Akiyama, B. Kobzi, K. Sinkó, Z. Homonnay, E. Kuzmann, M. Ristic´, S. Krehula, T.Nishida, S. Kubuki, J. Alloys Comp.
, 1-6 (2015).
This work is financially supported by International Research Collaboration Funds of TMU, Grant-in Aid in Japan No. 26630321 and Magyar-Japán TéT program (TÉT_12_JP-1-2014-0025).
* Faculty of Science, Eötvös Loránd University. Pázmány P. s. 1/A, 1117 Budapest, HUNGARY
** Faculty of Humanity-Oriented Science and Engineering, Kinki University. Kayanomori 11-6, Iizuka, Tokyo 820-8555, JAPAN