title: Facile fabrication of magnetic chitosan beads of fast kinetics and high capacity for copper removal.
abstract: In this study, magnetic chitosan (CS) beads of ∼200 nm in diameter were successfully prepared by a facile one-step method. The resultant composite Fe3O4-CS was characterized using transmission electron microscopy (TEM), X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR). Its adsorption toward Cu(II) ions was investigated as a function of solution pH, CS dosage, Cu(II) concentration, and contact time. The maximum capacity of Fe3O4-CS was 129.6 mg of Cu(II)/g of beads (617.1 mg/g of CS). More attractively, the adsorption equilibrium could be achieved within 10 min, which showed superior properties among the available CS-based adsorbents. Continuous adsorption-desorption cyclic results demonstrated that Cu(II)-loaded Fe3O4-CS can be effectively regenerated by ethylenediaminetetraacetic acid (EDTA) solution, and the regenerated composite beads could be employed for repeated use without significant capacity loss. Additionally, Fe3O4-CS beads can be readily separated from water within 30 s under a low magnetic field (<0.035 T).
authors: State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University , Nanjing 210023, People's Republic of China.
authors: Wei
authors: W
authors: Jiang
authors: Wenfeng
authors: W
authors: Wang
authors: Bingcai
authors: B
authors: Pan
authors: Quanxing
authors: Q
authors: Zhang
authors: Weiming
authors: W
authors: Zhang
authors: Lu
authors: L
authors: Lv
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D003300:Copper; D004492:Edetic Acid / Q000737:chemistry; D007700:Kinetics; D060328:Magnetic Phenomena; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; D003300:Copper; D048271:Chitosan; D004492:Edetic Acid