title: Adsorption of Cd(II), Cu(II) and Ni(II) ions by cross-linking chitosan/rectorite nano-hybrid composite microspheres.
abstract: Chitosan/rectorie (CTS/REC) nano-hybrid composite microsphere was prepared by changing the proportion of CTS/REC with 2:1, 3:1 and 4:1. Compared with the pure cross-linking chitosan microsphere, the nano-hybrid composite microsphere was proved to have better sorption capacity of Cd(II), Cu(II) and Ni(II), especially 2:1(CTS/REC-1). The adsorption behavior of the microsphere of Cd(II), Cu(II) and Ni(II) was investigated in single and binary metal systems. In single system, the equilibrium studies showed that the adsorption of Cd(II), Cu(II) and Ni(II) followed the Langmuir model and the pseudo-second-order kinetic model. The negative values of (ΔG) suggested that the adsorption process was spontaneous. In binary system, the combined action of the metals was found to be antagonistic and the metal sorption followed the order of Cu(II)>Cd(II)>Ni(II). The regeneration studies indicated that EDTA desorbed Cd(II), Cu(II) and Ni(II) from cross-linking microspheres better than HCl. The FT-IR and XPS spectra showed that coordination bonds were formed between Cd(II), Cu(II) and Ni(II) and the nitrogen atoms of cross-linking CTS/REC nano-hybrid composite microspheres.
authors.affiliation: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, 378 Waihuan West Road, Guangzhou 510006, China.
authors.forename: Lixuan
authors.initials: L
authors.lastname: Zeng
authors.affiliation: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, 378 Waihuan West Road, Guangzhou 510006, China.
authors.forename: Yufei
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, 378 Waihuan West Road, Guangzhou 510006, China.
authors.forename: Qiuyun
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, 378 Waihuan West Road, Guangzhou 510006, China.
authors.forename: Xingmei
authors.initials: X
authors.lastname: Guo
authors.affiliation: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, 378 Waihuan West Road, Guangzhou 510006, China.
authors.forename: Yanni
authors.initials: Y
authors.lastname: Peng
authors.affiliation: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, 378 Waihuan West Road, Guangzhou 510006, China.
authors.forename: Huijuan
authors.initials: H
authors.lastname: Xiao
authors.affiliation: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, 378 Waihuan West Road, Guangzhou 510006, China.
authors.forename: Xiaocheng
authors.initials: X
authors.lastname: Chen
authors.affiliation: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, 378 Waihuan West Road, Guangzhou 510006, China. Electronic address: holdit@126.com.
authors.forename: Jiwen
authors.initials: J
authors.lastname: Luo
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D002104:Cadmium / Q000737:chemistry* / Q000302:isolation & purification; D048271:Chitosan / Q000737:chemistry*; D003300:Copper / Q000737:chemistry* / Q000302:isolation & purification; D003432:Cross-Linking Reagents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008863:Microspheres; D008903:Minerals / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry* / Q000302:isolation & purification; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D000538:Aluminum Silicates; D003432:Cross-Linking Reagents; D008903:Minerals; C546376:rectorite; D002104:Cadmium; D003300:Copper; D009532:Nickel; D048271:Chitosan
keywords: Adsorption; Chitosan; Heavy metals; Microsphere; Rectorite