title: Fabrication of a novel magnetic carbon nanocomposite adsorbent via pyrolysis of sugar.
abstract: A new-fashioned fabrication recipe for a magnetic carbon nanocomposite (Fe3O4@C) via pyrolysis of sugar with magnetite (Fe3O4) nanoparticles was developed for the practical environmental application as an adsorbent. In order to synthesize Fe3O4@C, the thermal degradation of sugar was firstly investigated via thermo-gravimetric analysis (TGA) to explore the optimal pyrolytic conditions for fabricating Fe3O4@C. This study laid a great emphasis on the physicochemical characterization of pyrogenic Fe3O4@C through various analytical techniques, which experimentally validated that Fe3O4@C retained thin graphitic carbon layers containing carboxyl groups on the surface with the point of zero charge (pHpzc) of 7.5. Based on adsorption tests of methylene blue (MB), it was found the optimal mass ratio of sugar to Fe3O4 was 0.15 with pyrolysis temperature of 500 °C. The adsorption capacity of Fe3O4@C for MB was 52.6 mg g(-1) and MB adsorption showed a strong pH dependence, which implies an active role of electrostatic interactions in the adsorption process. In regeneration experiments, Fe3O4@C retained 84% of its initial adsorption capacity after completing four consecutive adsorption cycles.
authors.affiliation: Department of Environment and Energy, Sejong University, Seoul 05006, South Korea.
authors.forename: Dong-Wan
authors.initials: DW
authors.lastname: Cho
authors.affiliation: Department of Environment and Energy, Sejong University, Seoul 05006, South Korea.
authors.forename: Jechan
authors.initials: J
authors.lastname: Lee
authors.affiliation: Korea Biochar Research Center, Kangwon National University, Chuncheon 24341, South Korea.
authors.forename: Yong Sik
authors.initials: YS
authors.lastname: Ok
authors.affiliation: Department of Environment and Energy, Sejong University, Seoul 05006, South Korea. Electronic address: ekwon74@sejong.ac.kr.
authors.forename: Eilhann E
authors.initials: EE
authors.lastname: Kwon
authors.affiliation: Department of Environment and Energy, Sejong University, Seoul 05006, South Korea. Electronic address: hcsong@sejong.ac.kr.
authors.forename: Hocheol
authors.initials: H
authors.lastname: Song
mesh_terms: D000327:Adsorption; D018533:Biomass; D002244:Carbon / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry; D052203:Ferrosoferric Oxide / Q000737:chemistry; D006108:Graphite / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008280:Magnetics; D008751:Methylene Blue / Q000737:chemistry; D009005:Monosaccharides / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry; D013696:Temperature; D013818:Thermogravimetry
chemical_list: D005290:Ferric Compounds; D009005:Monosaccharides; D037742:Nanotubes, Carbon; C000499:ferric oxide; D002244:Carbon; D006108:Graphite; D008751:Methylene Blue; D052203:Ferrosoferric Oxide
keywords: Adsorbent; Biochar; Carbon/Fe(3)O(4) nanocomposite; Pyrolysis; Sugar