One-step microwave synthesis of magnetic biochars with sorption properties

Zubrik, Anton; Matik, Marek; Lovas, Michal; Stefusova, Katarina; Dankova, Zuzana; Hredzak, Slavomir; Vaclavikova, Miroslava; Bendek, Frantisek; Briancin, Jaroslav; Machala, Libor; Pechousek, Jiri

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자료유형: 동향자료

저자정보: Zubrik, Anton (Institute of Geotechnics, Slovak Academy of Sciences) Matik, Marek (Institute of Geotechnics, Slovak Academy of Sciences) Lovas, Michal (Institute of Geotechnics, Slovak Academy of Sciences) Stefusova, Katarina (Institute of Geotechnics, Slovak Academy of Sciences) Dankova, Zuzana (Institute of Geotechnics, Slovak Academy of Sciences) Hredzak, Slavomir (Institute of Geotechnics, Slovak Academy of Sciences) Vaclavikova, Miroslava (Institute of Geotechnics, Slovak Academy of Sciences) Bendek, Frantisek (Institute of Geotechnics, Slovak Academy of Sciences) Briancin, Jaroslav (Institute of Geotechnics, Slovak Academy of Sciences) Machala, Libor (Department of Experimental Physics, Faculty of Science, Palacky University) Pechousek, Jiri (Department of Experimental Physics, Faculty of Science, Palacky University)

저널정보: 한국탄소학회 Carbon letters Carbon letters 제26권

발행연도: 2018.1

수록면: 31 - 42 (12page)

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Adsorption is one of the best methods for wastewater purification. The fact that water quality is continuously decreasing requires the development of novel, effective and cost available adsorbents. Herein, a simple procedure for the preparation of a magnetic adsorbent from agricultural waste biomass and ferrofluid has been introduced. Specifically, ferrofluid mixed with wheat straw was directly pyrolyzed either by microwave irradiation (900 W, 30 min) or by conventional heating ($550^{\circ}C$, 90 min). Magnetic biochars were characterized by X-ray powder diffraction, $M{\ddot{o}}ssbauer$ spectroscopy, textural analysis and tested as adsorbents of As(V) oxyanion and cationic methylene blue, respectively. Results showed that microwave pyrolysis produced char with high adsorption capacity of As(V) ($Q_m=25.6mg\;g^{-1}$ at pH 4), whereas conventional pyrolysis was not so effective. In comparison to conventional pyrolysis, one-step microwave pyrolysis produced a material with expressive microporosity, having a nine times higher value of specific surface area as well as total pore volume. We assumed that sorption properties are also caused by several iron-bearing composites identified by $M{\ddot{o}}ssbauer$ spectroscopy ([super] paramagnetic $Fe_2O_3$, ${\alpha}-Fe$, non-stoichiometric $Fe_3C$, ${\gamma}-Fe_2O_3$, ${\gamma}-Fe$) transformed from nano-maghemite presented in the ferrofluid. Methylene blue was also more easily removed by magnetic biochar prepared by microwaves ($Q_m=144.9mg\;g^{-1}$ at pH 10.9) compared to using conventional techniques.

#magnetic biochar #microwave pyrolysis #ferrofluid #adsorption #arsenic

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