Combination of carboxymethyl chitosan-coated magnetic nanoparticles and chitosan-citrate complex gel beads as a novel magnetic adsorbent

Carbohydr Polym. 2015 Oct 20:131:255-63. doi: 10.1016/j.carbpol.2015.06.031. Epub 2015 Jun 17.

Abstract

Magnetic chitosan beads were synthesized by incorporating N,O-carboxymethyl chitosan-coated magnetic nanoparticles (NOCC-MNPs) into chitosan-citrate gel beads (CCGBs) for adsorbing Cu(II) ions. An increase of Cu(II) adsorption capacity was due to the combined chelation effects from the electron-donating functional groups in the CCGBs and NOCC-MNPs. Moreover, the paramagnetic susceptibility of Cu(II) citrate chelates could further improve the Cu(II) adsorption efficiency through the force of magnetic attraction. The adsorption data of the magnetic CCGBs fitted well with the Freundlich model, whereas the adsorption kinetics followed the pseudo-second-order kinetic model. The maximal adsorption capacity as estimated by the Langmuir model was 294.11mg/g. The adsorption thermodynamic parameters indicated that the involved process should be spontaneous and exothermic.

Keywords: Adsorption; Chitosan; Citrate; Magnetic nanoparticles.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adsorption
  • Chitosan / chemistry*
  • Gels / chemistry*
  • Hydrogen-Ion Concentration
  • Magnetite Nanoparticles / chemistry*
  • Magnetite Nanoparticles / ultrastructure
  • Microspheres*
  • Spectroscopy, Fourier Transform Infrared
  • Thermodynamics
  • X-Ray Diffraction

Substances

  • Gels
  • Magnetite Nanoparticles
  • chitosan citrate
  • O,N-carboxymethylchitosan
  • Chitosan