title: Templated preparation of porous magnetic microspheres and their application in removal of cationic dyes from wastewater.
abstract: Porous magnetic microspheres with large particle size (350-450 microm) were prepared with sulfonated macroporous polydivinylbenzene as a template. The preparation process included ferrous ion exchange and following oxidation by hydrogen peroxide. The results showed that the weight fraction of magnetic nanoparticles exceeded 20 wt% in microspheres after the preparation process was repeated three times. X-ray diffraction profiles indicated that the crystalline phase of as-formed magnetic nanoparticles was magnetite (Fe(3)O(4)). TEM images revealed rod-like magnetite crystal after the first oxidation cycle, however, the crystal morphologies were transferred into random shape after more oxidation cycles. The applicability of porous magnetic microspheres for removal of cationic dyes from water was also explored. The results exhibited that basic fuchsin and methyl violet could be quickly removed from water with high efficiency. More importantly, the magnetic microspheres could be easily regenerated and repeatedly employed for wastewater treatment. Therefore, a novel methodology was provided for fast removal cationic dyes from wastewater.
authors.affiliation: State Key Laboratory of Chemical Engineering, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China.
authors.forename: Qingquan
authors.initials: Q
authors.lastname: Liu
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Anguo
authors.initials: A
authors.lastname: Xiao
authors.forename: Jingming
authors.initials: J
authors.lastname: Gao
authors.forename: Wenbing
authors.initials: W
authors.lastname: Ding
authors.forename: Haojie
authors.initials: H
authors.lastname: Yu
authors.forename: Jia
authors.initials: J
authors.lastname: Huo
authors.forename: Mårten
authors.initials: M
authors.lastname: Ericson
mesh_terms: D002412:Cations; D004396:Coloring Agents / Q000302:isolation & purification*; D052203:Ferrosoferric Oxide; D008280:Magnetics; D008863:Microspheres; D053758:Nanoparticles; D010316:Particle Size; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D002412:Cations; D004396:Coloring Agents; D014874:Water Pollutants, Chemical; D052203:Ferrosoferric Oxide