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Statements

Subject Item
n2:RIV%2F67179843%3A_____%2F13%3A00394710%21RIV14-MSM-67179843
rdf:type
n13:Vysledek skos:Concept
dcterms:description
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. 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.
dcterms:title
Crystal and fine structural transformation of Heat-treated biogenic manganese oxide Crystal and fine structural transformation of Heat-treated biogenic manganese oxide
skos:prefLabel
Crystal and fine structural transformation of Heat-treated biogenic manganese oxide Crystal and fine structural transformation of Heat-treated biogenic manganese oxide
skos:notation
RIV/67179843:_____/13:00394710!RIV14-MSM-67179843
n13:predkladatel
n15:ico%3A67179843
n3:aktivita
n14:I n14:P
n3:aktivity
I, P(LH11111)
n3:cisloPeriodika
3
n3:dodaniDat
n8:2014
n3:domaciTvurceVysledku
n4:3082059 n4:3631699
n3:druhVysledku
n12:J
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n16:predkladatel
n3:idSjednocenehoVysledku
67381
n3:idVysledku
RIV/67179843:_____/13:00394710
n3:jazykVysledku
n9:eng
n3:klicovaSlova
microorganisms; biogenic manganese oxides; phase transitions; nano-sheets; microstructures
n3:klicoveSlovo
n7:microstructures n7:biogenic%20manganese%20oxides n7:microorganisms n7:nano-sheets n7:phase%20transitions
n3:kodStatuVydavatele
JP - Japonsko
n3:kontrolniKodProRIV
[CB788AA7ABFE]
n3:nazevZdroje
Journal of the Japan Society of Powder and Powder Metallurgy
n3:obor
n18:EH
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
11
n3:projekt
n5:LH11111
n3:rokUplatneniVysledku
n8:2013
n3:svazekPeriodika
60
n3:tvurceVysledku
Miyata, N. Ikeda, Y. Hashimoto, H. Fujii, T. Takada, J. Šafaříková, Miroslava Kusano, Y. Nishina, Y. Šafařík, Ivo Kimura, N. Nakanishi, Y.
s:issn
0532-8799
s:numberOfPages
8