title: Synthesis of water-dispersible poly-l-lysine-functionalized magnetic Fe3O4-(GO-MWCNTs) nanocomposite hybrid with a large surface area for high-efficiency removal of tartrazine and Pb(II).
abstract: In this study, a novel, effective and environment-friendly methods was used to prepare poly-l-lysine (PLL)-functionalized magnetic Fe3O4-(GO-MWCNTs) hybrid composite with large surface area and abundant hydroxyl and amino groups. The as-prepared PLL-Fe3O4-(GO-MWCNTs) nanocomposite was systematically characterized by FT-IR, XRD, TGA, SEM, TEM, VSM and EDX. The PLL-Fe3O4-(GO-MWCNTs) hybrid composite exhibited excellent adsorption performance for the removal of a dye (tartrazine) and a heave metal (Pb(II)). The result showed that adsorption of Pb(II) reached equilibrium in 30min and adsorption of tartrazine reached equilibrium in approximately 60min. Most importantly, PLL-Fe3O4-(GO-MWCNTs) hybrid possesses high adsorption capacity, rapid separation, and less time-consuming. The equilibrium adsorption capacity was 1038.42mgg-1for Pb(II) and 775.19mgg-1for tartrazine under the optimal conditions. These two pollutants removal were found to obey Langmuir adsorption model, while the kinetics of adsorption followed pseudo-second-order kinetic model. A possible adsorption mechanism has been proposed where the chelation between PLL and Pb(II) or electrostatic interaction between GO and tartrazine. These results demonstrated the potential applications of PLL-Fe3O4-(GO-MWCNTs) hybrid composite in deep-purification of polluted water.
authors.affiliation: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
authors.forename: Dan
authors.initials: D
authors.lastname: Hu
authors.affiliation: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Wan
authors.affiliation: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China. Electronic address: chemoffices@126.com.
authors.forename: Chunhua
authors.initials: C
authors.lastname: Zhou
mesh_terms: D000327:Adsorption; D060326:Chemistry Techniques, Synthetic; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000737:chemistry* / Q000302:isolation & purification; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D053761:Nanocomposites / Q000737:chemistry*; D036103:Nanotechnology; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011107:Polylysine / Q000737:chemistry*; D013499:Surface Properties; D013645:Tartrazine / Q000737:chemistry* / Q000302:isolation & purification; D013696:Temperature; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification; D018508:Water Purification
chemical_list: D058185:Magnetite Nanoparticles; D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical; D014867:Water; D011107:Polylysine; D007854:Lead; D013645:Tartrazine
keywords: Adsorption; GO-MWCNTs; Magnetic separation; Pb(II); Poly-l-lysine; Tartrazine