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  • Title: Preparation of magnetic modified chitosan and adsorption of Zn²⁺ from aqueous solutions.
    Author: Fan L, Luo C, Lv Z, Lu F, Qiu H.
    Journal: Colloids Surf B Biointerfaces; 2011 Dec 01; 88(2):574-81. PubMed ID: 21868204.
    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.
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