title: Preparation of magnetic modified chitosan and adsorption of Zn²⁺ from aqueous solutions.
abstract: The performance of a cross-linked magnetic modified chitosan (CMMC), which has been coated with magnetic fluids and cross-linked with glutaraldehyde, has been investigated for the adsorption of Zn(2+) from aqueous solutions. The CMMC with a diameter range of 20-50 nm was prepared. The effects of pH and the contact time for the adsorption have been discussed, and the optimal adsorption conditions for the adsorption of Zn(2+) have been obtained. The research results showed that CMMC was highly efficient for fast adsorption of Zn(2+) within the first 25 min, and adsorption equilibrium could be achieved in 30 min. Equilibrium studies showed that the data of Zn(2+) adsorption followed the Langmuir model. The maximum adsorption capacity for Zn(2+) was estimated to be 32.16 mg/g with a Langmuir adsorption equilibrium constant of 0.01 L/mg at 298 K, which demonstrated that the CMMC had obvious efficient adsorption of Zn(2+). The CMMC was stable and easily recovered. Moreover, the adsorption rate was about 90% of the initial saturation adsorption capacity after being used five times.
authors.affiliation: College of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, China. fanlu1949@126.com
authors.forename: Lulu
authors.initials: L
authors.lastname: Fan
authors.forename: Chuannan
authors.initials: C
authors.lastname: Luo
authors.forename: Zhen
authors.initials: Z
authors.lastname: Lv
authors.forename: Fuguang
authors.initials: F
authors.lastname: Lu
authors.forename: Huamin
authors.initials: H
authors.lastname: Qiu
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008280:Magnetics; D015394:Molecular Structure; D014867:Water / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D014867:Water; D048271:Chitosan; D015032:Zinc