title: Amino-functionalized Fe(3)O(4)@SiO(2) core-shell magnetic nanomaterial as a novel adsorbent for aqueous heavy metals removal.
abstract: A novel amino-functionalized Fe(3)O(4)@SiO(2) magnetic nanomaterial with a core-shell structure was developed, aiming to remove heavy metal ions from aqueous media. The structural, surface, and magnetic characteristics of the nanosized adsorbent were investigated by elemental analysis, FTIR, N(2) adsorption-desorption, transmission electron microscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy, vibrating sample magnetometry, thermogravimetric analysis, and zeta-potential measurement. The amino-functionalized Fe(3)O(4)@SiO(2) nanoadsorbent exhibited high adsorption affinity for aqueous Cu(II), Pb(II), and Cd(II) ions, resulting from complexation of the metal ions by surface amino groups. Moreover, the adsorption affinity for heavy metal ions was not much impacted by the presence of a cosolute of humic acid (10.6mg/L) or alkali/earth metal ions (Na(+), K(+), Mg(2+)) (0.025-0.30mmol/L). The metal-loaded Fe(3)O(4)@SiO(2)-NH(2) nanoparticles could be recovered readily from aqueous solution by magnetic separation and regenerated easily by acid treatment. Findings of the present work highlight the potential for using amino-functionalized Fe(3)O(4)@SiO(2) magnetic nanoparticles as an effective and recyclable adsorbent for the removal of heavy metal ions in water and wastewater treatment.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, and School of the Environment, Nanjing University, Jiangsu 210093, People's Republic of China.
authors.forename: Jiahong
authors.initials: J
authors.lastname: Wang
authors.forename: Shourong
authors.initials: S
authors.lastname: Zheng
authors.forename: Yun
authors.initials: Y
authors.lastname: Shao
authors.forename: Jingliang
authors.initials: J
authors.lastname: Liu
authors.forename: Zhaoyi
authors.initials: Z
authors.lastname: Xu
authors.forename: Dongqiang
authors.initials: D
authors.lastname: Zhu
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D008280:Magnetics; D019216:Metals, Heavy / Q000302:isolation & purification*; D049329:Nanostructures / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D000588:Amines; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D014867:Water; D012822:Silicon Dioxide; D052203:Ferrosoferric Oxide