Environmental approach and artificial intelligence for Ni(II) and Cd(II) biosorption from aqueous solution using Typha domingensis biomass
2016; Elsevier BV; Volume: 95; Linguagem: Inglês
10.1016/j.ecoleng.2016.07.007
ISSN1872-6992
AutoresManal Fawzy, Mahmoud Nasr, Samar M. Adel, Heba Nagy, Shacker Helmi,
Tópico(s)Adsorption and biosorption for pollutant removal
ResumoThis 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: 50 mg L−1, biosorbent dosage: 10.0 g L−1 and particle-size: 0.5 mm, the highest Ni(II) removal efficiency of 31.0% was obtained at pH: 6.0 within 30 min, whereas the maximum Cd(II) removal efficiency was 78.1% at pH: 7.0 within 15 min. 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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