Surface Observation and Magnetism of Oil-Extracted Botryococcus braunii Residues before and after Carbonization

Microalgae is a promising next-generational energy. In this research, we focus on oil-extracted Botryococcus braunii residues collected by adding polysilicato-iron (PSI) as a flocculant followed by carbonization under argon atmosphere. We conducted carbonization at various temperatures as a first at...

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Bibliographic Details
Published inC (Basel) Vol. 4; no. 1; p. 10
Main Authors Wang, Aohan, Demura, Mikihide, Watanabe, Makoto, Ohara, Kotaro, Kashiwagi, Takanari, Kadowaki, Kazuo, Kita, Eiji, Dong, Jiuchao, Goto, Hiromasa
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2018
Subjects
57Fe Mössbauer
Alternative energy
Biomass
Botryococcus braunii residues
Carbon
Carbonization
Fe3O4
flocculant
Heat treatment
Heavy metals
Hydrocarbons
Iron oxides
Magnetic properties
Magnetism
Microbiology
Nanoparticles
Phase transitions
polysilicato-iron
porous structure
Residues
Scanning electron microscopy
Spectrum analysis
Substrates
superconducting quantum interference device (SQUID)
Japan
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Summary:Microalgae is a promising next-generational energy. In this research, we focus on oil-extracted Botryococcus braunii residues collected by adding polysilicato-iron (PSI) as a flocculant followed by carbonization under argon atmosphere. We conducted carbonization at various temperatures as a first attempt to reveal the fundamental properties of the carbonization process of the microbes. The carbons thus obtained by heat treatment at 900 °C present a unique magnetic behavior due to reduced magnetite (Fe3O4) inclusion, which is produced from polysilicato iron (Fe2O3) during the heating process. Experimental results suggest that this carbonic material can be applied as a heavy metal-capturing carbon and magnetic porous substrate catalyst. The effective use of the waste may open a new avenue for an energy-microbiology-materials system.
ISSN:2311-5629
2311-5629
DOI:10.3390/c4010010