Crystal and fine structural transformations of heat-treated biogenic manganese oxide

Noriyasu Kimura; Hideki Hashimoto; Naoyuki Miyata; Yuta Nishina; Yoshihiro Kusano; Yasunori Ikeda; Makoto Nakanishi; Tatsuo Fujii; Ivo Safarik; Mirka Safarikova; Jun Takada

doi:10.2497/jjspm.60.92

Crystal and fine structural transformations of heat-treated biogenic manganese oxide

Noriyasu Kimura, Hideki Hashimoto, Naoyuki Miyata, Yuta Nishina, Yoshihiro Kusano, Yasunori Ikeda, Makoto Nakanishi, Tatsuo Fujii, Ivo Safarik, Mirka Safarikova, Jun Takada

Research output: Contribution to journal › Article › peer-review

Abstract

In the natural aquatic environment, there are various types of biogenic manganese oxide (BMO) precipitates which are produced by manganese oxidizing microorganisms, at ambient temperature, atmosphere and neutral pH. BMO is a very interesting and useful functional material because of its unique property; hollow globule shape formed by nanosheets, large surface area and photocatalytic characteristics. In this study, thermally-processed BMO at 100-1000°C was analyzed by XRD, XANES, SEM, TEM and nitrogen adsorption method to reveal the effects of heat-treatment on its crystal structure, Mn valence state, globule morphology, microstructure, pore size distribution and specific surface area. In the result, morphology of BMO is maintained below 800 °C, while nanosheets composing BMO were changed into nanoparticles at 600 °C. The crystal structure was transformed from birnessite into hausmannite (Mn304) at 600 °C. The specific surface area was increased by heat-treatment between 300 and 500 °C. In cases of artificial manganese oxides, such changes of crystal structure and specific surface area were not observed, and combustion of organic materials produced by microorganisms in BMO probably has a large effect on them.

Original language	English
Pages (from-to)	92-99
Number of pages	8
Journal	Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume	60
Issue number	3
DOIs	https://doi.org/10.2497/jjspm.60.92
Publication status	Published - Mar 2013

Keywords

Biogenic manganese oxides
Microorganisms
Microstructures
Nano-sheets
Phase transitions

ASJC Scopus subject areas

Mechanical Engineering
Industrial and Manufacturing Engineering
Metals and Alloys
Materials Chemistry

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10.2497/jjspm.60.92

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Kimura, N., Hashimoto, H., Miyata, N., Nishina, Y., Kusano, Y., Ikeda, Y., Nakanishi, M., Fujii, T., Safarik, I., Safarikova, M., & Takada, J. (2013). Crystal and fine structural transformations of heat-treated biogenic manganese oxide. Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, 60(3), 92-99. https://doi.org/10.2497/jjspm.60.92

Kimura, N, Hashimoto, H, Miyata, N, Nishina, Y, Kusano, Y, Ikeda, Y, Nakanishi, M , Fujii, T, Safarik, I, Safarikova, M & Takada, J 2013, 'Crystal and fine structural transformations of heat-treated biogenic manganese oxide', Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, vol. 60, no. 3, pp. 92-99. https://doi.org/10.2497/jjspm.60.92

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abstract = "In the natural aquatic environment, there are various types of biogenic manganese oxide (BMO) precipitates which are produced by manganese oxidizing microorganisms, at ambient temperature, atmosphere and neutral pH. BMO is a very interesting and useful functional material because of its unique property; hollow globule shape formed by nanosheets, large surface area and photocatalytic characteristics. In this study, thermally-processed BMO at 100-1000°C was analyzed by XRD, XANES, SEM, TEM and nitrogen adsorption method to reveal the effects of heat-treatment on its crystal structure, Mn valence state, globule morphology, microstructure, pore size distribution and specific surface area. In the result, morphology of BMO is maintained below 800 °C, while nanosheets composing BMO were changed into nanoparticles at 600 °C. The crystal structure was transformed from birnessite into hausmannite (Mn304) at 600 °C. The specific surface area was increased by heat-treatment between 300 and 500 °C. In cases of artificial manganese oxides, such changes of crystal structure and specific surface area were not observed, and combustion of organic materials produced by microorganisms in BMO probably has a large effect on them.",

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author = "Noriyasu Kimura and Hideki Hashimoto and Naoyuki Miyata and Yuta Nishina and Yoshihiro Kusano and Yasunori Ikeda and Makoto Nakanishi and Tatsuo Fujii and Ivo Safarik and Mirka Safarikova and Jun Takada",

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doi = "10.2497/jjspm.60.92",

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AU - Kimura, Noriyasu

AU - Hashimoto, Hideki

AU - Miyata, Naoyuki

AU - Nishina, Yuta

AU - Kusano, Yoshihiro

AU - Ikeda, Yasunori

AU - Nakanishi, Makoto

AU - Fujii, Tatsuo

AU - Safarik, Ivo

AU - Safarikova, Mirka

AU - Takada, Jun

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Crystal and fine structural transformations of heat-treated biogenic manganese oxide

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Keywords

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