title: A new porous magnetic chitosan modified by melamine for fast and efficient adsorption of Cu(II) ions.
abstract: A new porous magnetic chitosan modified by melamine (MA-CS/Fe3O4) was synthesized. The compositions and surface topographies were characterized by infrared (IR) spectroscopy, X-ray diffraction (XRD) analysis, thermogravimetric (TG) analysis and scanning electron microscope (SEM), respectively. The results of adsorption kinetics showed the adsorption behavior could be better described by the pseudo-second-order equation (R>0.999). The adsorption isotherm was well fitted by the Langmuir equation (R>0.999), and the values of separation factors were in the range of 0-1.0. The maximum adsorption capacity for Cu(II) was 2.58mmolg(-1) at the optimal experimental conditions, which were pH=5.5, t=25min, C0=5.0mmolL(-1). The rate-controlling step was supposed to be chemical adsorption rather than mass transport. The adsorbent still exhibited high adsorption capacity after five regeneration cycles. The adsorption mechanism was due to coordination between Cu(II) and N atoms.
authors.affiliation: State Key Laboratory Base of Eco-Chemical Engineering, Laboratory of Inorganic Synthesis and Applied Chemistry, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China. Electronic address: wuzhan_chao@163.com.
authors.forename: Zhan-Chao
authors.initials: ZC
authors.lastname: Wu
authors.affiliation: State Key Laboratory Base of Eco-Chemical Engineering, Laboratory of Inorganic Synthesis and Applied Chemistry, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
authors.forename: Zhao-Zhan
authors.initials: ZZ
authors.lastname: Wang
authors.affiliation: State Key Laboratory Base of Eco-Chemical Engineering, Laboratory of Inorganic Synthesis and Applied Chemistry, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
authors.forename: Jie
authors.initials: J
authors.lastname: Liu
authors.affiliation: State Key Laboratory Base of Eco-Chemical Engineering, Laboratory of Inorganic Synthesis and Applied Chemistry, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
authors.forename: Jin-Hua
authors.initials: JH
authors.lastname: Yin
authors.affiliation: State Key Laboratory Base of Eco-Chemical Engineering, Laboratory of Inorganic Synthesis and Applied Chemistry, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China. Electronic address: qustksp@126.com.
authors.forename: Shao-Ping
authors.initials: SP
authors.lastname: Kuang
mesh_terms: D000327:Adsorption; D002152:Calorimetry, Differential Scanning; D048271:Chitosan / Q000737:chemistry*; D003300:Copper / Q000302:isolation & purification*; D005290:Ferric Compounds / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D008280:Magnetics; D008962:Models, Theoretical; D056951:Photoelectron Spectroscopy; D016062:Porosity; D013055:Spectrophotometry, Infrared; D013535:Suspensions; D013818:Thermogravimetry; D013997:Time Factors; D014227:Triazines / Q000138:chemical synthesis* / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D007477:Ions; D013535:Suspensions; D014227:Triazines; C000499:ferric oxide; D003300:Copper; D048271:Chitosan; C011907:melamine
keywords: Adsorption of Cu(II); Magnetic chitosan; Melamine