Preparation of Ca2+ Imprinted Cross Linked Modified Chitosan and Its Adsorption Properties for Cd2+
DOI:
CSTR:
Author:
Affiliation:

Clc Number:

TB332

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

  • Article
  • |
  • Figures
  • |
  • Metrics
  • |
  • Reference
  • |
  • Related
  • |
  • Cited by
  • |
  • Materials
  • |
  • Comments
    Abstract:

    To improve the adsorption performance of chitosan for heavy metal ions, the Ca2+ imprinted cross linked modified chitosan (CK) was obtained by Ca2+ imprint, glutaraldehyde crosslinking, freeze drying and carbon disulfide modification of chitosan (CS). The structure of adsorbents were characterized by FTIR, XRD and BET. The adsorption properties and mechanisms of Cd2+ were investigated by static adsorption experiment. The experimental results showed that the amino groups were successfully protected by Ca2+, the acid solubility of CS was improved by glutaraldehyde crosslinking (when pH=2, CK could be used), the specific surface area was increased to 272.82 m2/g and pore volume was increased to 0.44 cm3/g by freeze-dry method, and the C=S groups were successfully introduced by CS2 modification to improve the adsorption capacity of Cd2+ on CK. The Cd2+ adsorption capacity of CK was 49.43mg/g, adsorption capacity increased by 57.7% than that of CS. The adsorption of Cd2+ on CK was agreed will with the pseudo second order kinetics model, and the rate constant was 0.025 g/(mg•min). The adsorption of Cd2+ on CK accorded with Freundlich equation, and the n was 4.45. The Dubinin Radushkevich model indicated that the adsorption process of Cd2+ on CK was chemical adsorption, and the mean adsorption energy was 2236kJ/mol. The selective adsorption experiment indicated that CK had the properties of specific absorption with Cd2+, and the relative selectivity coefficients were greater than 3.54 besides Ca2+.

    Reference
    Related
    Cited by
Get Citation
Share
Article Metrics
  • Abstract:
  • PDF:
  • HTML:
  • Cited by:
History
  • Received:May 16,2017
  • Revised:July 31,2017
  • Adopted:August 29,2017
  • Online: March 15,2018
  • Published:
Article QR Code