title: Graphene oxide/ferroferric oxide/polyethylenimine nanocomposites for Congo red adsorption from water.
abstract: Graphene oxide/ferroferric oxide/polyethylenimine (GO/Fe3O4/PEI) nanocomposites were synthesized by an in situ growth of Fe3O4nanoparticles on GO sheets, and then modified by PEI. The GO/Fe3O4/PEI nanocomposites showed extremely high removal efficiency for anionic dye Congo Red (CR) due to the positively charged PEI molecules (methylene blue was also tested but with low adsorption capacity due to its cationic property). The CR removal capacity was 574.7 mg g-1, higher than most of reported results. The adsorption kinetics could be well described by a pseudo-second-order model. Furthermore, GO/Fe3O4/PEI nanocomposites could be easily recycled by magnetic separation. The removal efficiency remained above 70% after five cycles.
authors.affiliation: a College of Environment and Safety Engineering , Qingdao University of Science and Technology , Qingdao , People's Republic of China.
authors.forename: Lina
authors.initials: L
authors.lastname: Wang
authors.affiliation: b College of Materials Science and Engineering , Qingdao University of Science and Technology , Qingdao , People's Republic of China.
authors.forename: Changming
authors.initials: C
authors.lastname: Mao
authors.affiliation: b College of Materials Science and Engineering , Qingdao University of Science and Technology , Qingdao , People's Republic of China.
authors.forename: Ning
authors.initials: N
authors.lastname: Sui
authors.affiliation: b College of Materials Science and Engineering , Qingdao University of Science and Technology , Qingdao , People's Republic of China.
authors.forename: Manhong
authors.initials: M
authors.lastname: Liu
authors.affiliation: b College of Materials Science and Engineering , Qingdao University of Science and Technology , Qingdao , People's Republic of China.|c Department of Chemistry and Physics , Louisiana State University Shreveport , Shreveport , LA , USA.
authors.forename: William W
authors.initials: WW
authors.lastname: Yu
mesh_terms: D000327:Adsorption; D002412:Cations; D004396:Coloring Agents / Q000737:chemistry; D003224:Congo Red / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry; D053761:Nanocomposites / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D011094:Polyethyleneimine / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D062065:Wastewater; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods
chemical_list: D002412:Cations; D004396:Coloring Agents; D003224:Congo Red; D006108:Graphite; D007501:Iron; D008751:Methylene Blue; D010087:Oxides; D011094:Polyethyleneimine; D062065:Wastewater; D014867:Water; D014874:Water Pollutants, Chemical
keywords: Adsorption; Fe3o4; graphene oxide; nanocomposite; polyethylenimine