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Application of chitosan-citric acid nanoparticles for removal of chromium (VI)

Bagheri, M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijbiomac.2015.07.022
  3. Publisher: Elsevier , 2015
  4. Abstract:
  5. In the present study, CS-CA nanoparticle was prepared for forming a new amide linkage, by grafting the amino groups of CS in the presence of carboxylic groups of CA that acts as cross-linking agent. The as-prepared CS-CA nanoparticle samples were characterized by use of dynamic light scattering (DLS), scanning electron microscopy (SEM), Fourier-transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques, which showed that the cross-linking agent preserved during the chemical modifications. The adsorption capacity of the CS-CA nanoparticles for the removal of Cr (VI) in aqueous solution was studied. The adsorption equilibrium data taken at the optimized condition, i.e., 25. °C and pH of 3, were analyzed with the Langmuir, Freundlich and Redlich-Peterson isotherm models. The kinetics of Cr (VI) adsorption on CS-CA nanoparticles obtained at different initial concentrations were also analyzed using the pseudo-second-order model
  6. Keywords:
  7. Chitosan-CA nanoparticle ; Cr (VI) ; Desorption ; Isotherm ; Citric acid ; Water ; Chitosan citrate ; Chromium hexavalent ion ; Analytical parameters ; Concentration (parameters) ; Contact time ; Cross linking ; Dynamic light scattering ; Heavy metal removal ; Investigative procedures ; Mathematical analysis ; PH ; Scanning electron microscopy ; Temperature ; Thermodynamics ; Weight ; X ray photoelectron spectroscopy ; Chemistry ; Isolation and purification ; Molecular weight ; Ultrastructure ; Water management ; X ray diffraction ; Adsorption ; Chitosan ; Chromium ; Hydrogen-Ion Concentration ; Kinetics ; Nanoparticles ; Particle Size ; Powder Diffraction ; Water Pollutants, Chemical ; Water Purification ; X-Ray Diffraction
  8. Source: International Journal of Biological Macromolecules ; Volume 80 , September , 2015 , Pages 431-444 ; 01418130 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0141813015004833