title: Removal of PCP-Na from aqueous systems using monodispersed pompon-like magnetic nanoparticles as adsorbents.
abstract: Novel monodispersed pompon-like magnetite/chitosan (Fe3O4/CS) composite nanoparticles were synthesized by a solvothermal method and used as adsorbents for the removal of toxic sodium pentachlorophenate (PCP-Na) from aqueous media. The adsorption behavior of PCP-Na on Fe3O4/CS obeyed the Langmuir isotherm and fitted the pseudo-second-order kinetics model. Thermodynamic parameters showed that the adsorption process was exothermic and spontaneous. Moreover, the adsorption was strongly pH-dependent. The results of XPS, thermodynamics, pH-dependent and desorption studies suggested that electrostatic attraction, hydrogen bonding and π-π interactions were all believed to play a role in PCP-Na adsorption on Fe3O4/CS. Having a saturation magnetization of 22.2 emu · g(-1), the Fe3O4/CS can be easily separated from water with magnets within 2 min. The adsorption equilibrium was achieved quite rapidly (within 30 min) and the maximum removal of PCP-Na (91.5%) was obtained at 25 °C and pH 6.5. The Fe3O4/CS investigated can be used to remove PCP-Na and other contaminants from wastewater.
authors.affiliation: State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Fuxing Road A1, Haidian District, Beijing 100038, China E-mail: liuyu@tjhri.com; College of Environmental Science and Engineering, Nankai University, Weijin Road 94, Nankai District, Tianjin 300071, China; Tianjin Hydraulic Science Research Institute, Youyi Road 60, Hexi District, Tianjin 300061, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.affiliation: College of Environmental Science and Engineering, Nankai University, Weijin Road 94, Nankai District, Tianjin 300071, China.
authors.forename: Hongbing
authors.initials: H
authors.lastname: Yu
authors.affiliation: College of Environmental Science and Engineering, Nankai University, Weijin Road 94, Nankai District, Tianjin 300071, China.
authors.forename: Sihui
authors.initials: S
authors.lastname: Zhan
authors.affiliation: Tianjin Hydraulic Science Research Institute, Youyi Road 60, Hexi District, Tianjin 300061, China.
authors.forename: Shengjun
authors.initials: S
authors.lastname: Li
authors.affiliation: Tianjin Hydraulic Science Research Institute, Youyi Road 60, Hexi District, Tianjin 300061, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Yang
authors.affiliation: Tianjin Hydraulic Science Research Institute, Youyi Road 60, Hexi District, Tianjin 300061, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D010316:Particle Size; D010416:Pentachlorophenol / Q000302:isolation & purification*; D013499:Surface Properties; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D058185:Magnetite Nanoparticles; D014874:Water Pollutants, Chemical; D048271:Chitosan; D010416:Pentachlorophenol