title: Superparamagnetic high-surface-area Fe3O4 nanoparticles as adsorbents for arsenic removal.
abstract: Superparamagnetic ascorbic acid-coated Fe(3)O(4) nanoparticles with a high specific surface area were successfully synthesized via an environmentally friendly hydrothermal route in the absence of any templates. The as-synthesized ascorbic acid-coated Fe(3)O(4) nanoparticles have a diameter of less than 10 nm, thus leading to a high specific surface area of about 179 m(2)/g, which is even larger than those of well-defined mesoporous structures. The only used capped agent is ascorbic acid, which serves as a functionalized molecule to make sure the high dispersibility and stability of the ascorbic acid-coated Fe(3)O(4) nanoparticles in aqueous solution. The ascorbic acid-coated Fe(3)O(4) nanoparticles exhibit superparamagnetic properties at room temperature and saturation magnetization approaches 40 emu g(-1). The ascorbic acid-coated Fe(3)O(4) nanoparticles were evaluated as an absorbent to remove heavy metal arsenic from wastewater. The adsorption data obeyed the Langmuir equation with a maximum adsorption capacity of 16.56 mg/g for arsenic (V), and 46.06 mg/g for arsenic (III).
authors.affiliation: Key Laboratory of Cluster Science, Ministry of Education of China, Department of Chemistry, Beijing Institute of Technology, Beijing, PR China.
authors.forename: Liyun
authors.initials: L
authors.lastname: Feng
authors.forename: Minhua
authors.initials: M
authors.lastname: Cao
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Ma
authors.forename: Yongshuang
authors.initials: Y
authors.lastname: Zhu
authors.forename: Changwen
authors.initials: C
authors.lastname: Hu
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000302:isolation & purification*; D001205:Ascorbic Acid / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide; D001151:Arsenic; D001205:Ascorbic Acid