Study on the Adsorption of Pb, Zn, Cu, Ni, and Cd by Modified Ligand in a Single Component Aqueous Solution: Equilibrium, Kinetic, Thermodynamic, and Desorption Studies

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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