title: Facile preparation of magnetic carbonaceous nanoparticles for Pb2+ ions removal.
abstract: Magnetic carbonaceous nanoparticles were prepared by a facile two-step solution phase thermal synthesis. Magnetic nanoparticles (MNPs) with size less than 100 nm were first generated from FeCl(3) in a solvothermal reaction. The size could be significantly reduced to approximately 30 nm when 1,6-hexanediamine was employed in the reaction solution to functionalize the surface of MNPs with amine. Both the plain and amine-functionalized MNPs (MH) were effectively encapsulated in the carbonaceous shell by hydrothermal treatment in 0.5 M glucose solution. The saturation magnetization of MH decreased significantly from 70 to 25 emu/g after carbonaceous shell was formed. The as-prepared magnetic carbonaceous nanoparticles (MH@C) carries a negative surface charge (-30 mV) at neutral pH and has a point of zero charge (PZC) at pH 2. The carbonaceous shell not only can protect the magnetic nanoparticles (MNP) from the corrosive environment but also possesses a high adsorption capacity towards Pb(II). The adsorption isotherm at room temperature can be well-fitted by Langmuir model with a maximum adsorption capacity of 123 mg/g.
authors.affiliation: Department of Chemical Engineering National Taiwan University of Science and Technology, 43 Keelung Rd Sec. 4, Taipei 106, Taiwan.
authors.forename: Iryanti Fatyasari
authors.initials: IF
authors.lastname: Nata
authors.forename: Giyanto Wijaya
authors.initials: GW
authors.lastname: Salim
authors.forename: Cheng-Kang
authors.initials: CK
authors.lastname: Lee
mesh_terms: D000327:Adsorption; D002244:Carbon; D005296:Ferrous Compounds; D007854:Lead / Q000302:isolation & purification*; D008280:Magnetics; D053758:Nanoparticles / Q000737:chemistry*; D012996:Solutions; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods
chemical_list: D005296:Ferrous Compounds; D012996:Solutions; D014874:Water Pollutants, Chemical; D007854:Lead; D002244:Carbon; C029451:ferrous chloride