title: Preparation of nanocrystalline Fe 3-x LaxO4 ferrite and their adsorption capability for Congo red.
abstract: This investigation was to increase the adsorption capacity of magnetite for Congo red (CR) by adulterating a small quantity of La(3+) ions into it. The adsorption capability of nanocrystalline Fe(3-x)La(x)O(4) (x=0, 0.01, 0.05, 0.10) ferrite to remove CR from aqueous solution was evaluated carefully. Compared with undoped magnetite, the adsorption values were increased from 37.4 to 79.1 mg g(-1). The experimental results prove that it is effectual to increase the adsorption capacity of magnetite by doped La(3+) ions. Among the La(3+)-doped magnetite, Fe(2.95)La(0.05)O(4) nanoparticles exhibit the highest saturation magnetization and the maximum adsorption capability. The desorption ability of La(3+)-doped magnetite nanoparticles loaded by CR can reach 92% after the treatment of acetone. Furthermore, the Fe(3-x)La(x)O(4) nanoparticles exhibited a clearly ferromagnetic behavior under applied magnetic field, which allowed their high-efficient magnetic separation from wastewater. It is found that high magnetism facilitates to improve their adsorption capacity for the similar products.
authors.affiliation: Key Laboratory of Automobile Materials (Jilin University), Ministry of Education and School of Materials Science and Engineering, Jilin University, Changchun 130022, China.
authors.forename: Lixia
authors.initials: L
authors.lastname: Wang
authors.forename: Jianchen
authors.initials: J
authors.lastname: Li
authors.forename: Yingqi
authors.initials: Y
authors.lastname: Wang
authors.forename: Lijun
authors.initials: L
authors.lastname: Zhao
mesh_terms: D000327:Adsorption; D003224:Congo Red / Q000737:chemistry / Q000302:isolation & purification*; D007700:Kinetics; D007811:Lanthanum / Q000737:chemistry*; D060526:Magnetic Fields; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D008962:Models, Theoretical; D015394:Molecular Structure; D010087:Oxides / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D058185:Magnetite Nanoparticles; D010087:Oxides; D014874:Water Pollutants, Chemical; D003224:Congo Red; C103829:lanthanum oxide; D007811:Lanthanum