Abstract
The present study evaluates the most suitable conditions for Ni(II) ions biosorption by green alga (Schizomeris leibleinii) using the Response Surface Methodology (RSM). Batch experiments were performed under RSM modeling (R2=0.9886), considering a number of factors, including pH, Biomass Dose, and Initial Ni(II) Concentration. Considering the presence of rich functional groups on the surface of the green marine alga, an uptake capacity of 50.46 ± 0.04 mg/g and a removal efficiency of 91.74% were obtained. The biosorption process was characterized by thermodynamic, isothermic, and kinetic studies. The results show that the removal process is exothermic, mono-layer, feasible, and controlled by the chemisorption stage. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) were utilized to characterize the biomass, confirming the feasibility of metal ions uptake. Moreover, the desorption stages were performed under optimal conditions with an efficiency of 80.33-71.00%. Schizomeris leibleinii was shown to be sustainable, reusable, and reliable for biosorption.
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