Vol. 2, Issue 6 (2018)
Adsorptive behaviour, Isothermal and Kinetic modeling involved in removal of Ni (II) and Cu (II) ions using N, N-Dibenzylidene-ethane-1, 2-diamine Schiff base
Author(s): Abdul AS, Ibrahim MA, Ibrahim MB
Abstract: In this study, a Schiff base N,N-Dibenzylidene-ethane-1,2-diamine derived from ethylenediamine and Benz aldehyde was successfully prepared and used as adsorbent for the removal of Cu(II) and Ni(II) ions from their aqueous solutions in batch mode. Batch optimization parameters were studied at the equilibrium time of 60 minutes for both Ni (II) and Cu (II). Residual metal ion concentration where determined using atomic absorption spectrometry. Effect of initial metal ion concentration showed that they give higher % removal at 200 mg/L. The adsorption kinetics revealed the metal ions were adsorbed satisfactorily obeying Pseudo second order model with R2 values of 0.984 and 0.989 for Ni (II) and Cu (II) respectively. The optimum pH value obtained was 4 for both Cu (II) and Ni (II). Langmuir isotherm model fitted well with the experimental data showing the process is chemisorption. The calculated RL values of the metal ions 0.0036 for Ni (II) and 0.0055 for Cu (II) revealed the adsorption process being favourable. The calculated heat of adsorption values of 106.0 J/mol for Ni (II) and 961.7 J/mol for Cu (II) also showed that the adsorption of the metal ions onto the synthesized Schiff base is a chemical process.
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