In this investigation, an amino
functionalized adsorbent was developed by grafting 4-aminobenzoic acid onto the
backbone of cross-linked chitosan beads. FTIR, XRD , SEM, and TGA were
characterised by 3 sets of beads including chitosan (CX), glutaraldehyde cross-linked
chitosan (CCX) and 4-aminobenzoic acid grafted cross-linked chitosan (FGCX).
The content of water and the amine concentration of FGCX have been calculated.
For further research , the effect of adsorption parameters was studied and the
optimum was used. Equilibrium data were obtained at different initial
concentrations from the adsorption experiment; the data were used in
isothermal, thermodynamic and kinetic studies. The models Langmuir and
Dubinin-Kaganer-Radushkevich (DKR) were effective in Definition
of isothermal data for the metal ions considered, whereas some of the metal
ions considered are equipped by the Freundlich and Temkin model. The kinetic
data was represented very well by the pseudo-second - order and intra-particle
model. Thermodynamic parameters such as the free energy change of Gibb (almost
°), the change in enthalpy (almost °) and the change in entropy (almost °) have
been measured and the results indicate that the adsorption of Pb, Cu, Ni , Zn,
and Cd ions into FGCX is spontaneous and endothermic. For the metal ions
considered, regeneration of the spent adsorbent was effective.
Author (s) Details
Dr. E. Igberase
Department of Chemical Engineering, Vaal University of Technology, Private
Mail Bag X021, Vanderbijlpark 1900, South Africa.
Prof. P. Osifo
Department of Chemical Engineering, Vaal University of Technology, Private Mail
Bag X021, Vanderbijlpark 1900, South Africa.
A. Ofomaja
Department
of Chemical Engineering, Vaal University of Technology, Private Mail Bag X021,
Vanderbijlpark 1900, South Africa.
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