Abstract
This study was carried out to examine the Typha domingensis as a biosorbent for the removal of Ni(II) and Cd(II) ions from aqueous solution, and to determine the experimental parameter that mostly influenced the biosorption process. The sorption mechanism was discussed in combination with the results obtained from Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). Results revealed that, at initial metal-ions concentration: 50mgL−1, biosorbent dosage: 10.0gL−1 and particle-size: 0.5mm, the highest Ni(II) removal efficiency of 31.0% was obtained at pH: 6.0 within 30min, whereas the maximum Cd(II) removal efficiency was 78.1% at pH: 7.0 within 15min. The adsorption equilibrium data of Ni(II) fitted well to the Freundlich isotherm (r2: 0.9202), while Cd(II) adsorption was described well with both isotherms of Langmuir (r2: 0.9504) and Freundlich (r2: 0.9480). Kinetic studies showed that pseudo-second order described well the biosorption experimental data (r2>0.98). Furthermore, through modeling of an adaptive neuro-fuzzy inference system (ANFIS), the sequence of experimental parameters affecting metal-ions removal efficiency for Ni(II) ions was: Ni(II) concentration>contact time>pH>biosorbent dosage>particle-size, while for Cd(II) ions, the sequence was: pH>Cd(II) concentration>contact time>particle-size>biosorbent dosage.
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