Kinetic, isotherm, thermodynamic, and adsorption capacity studies of magnetic Spirulina microalgae onto zinc (II)

Abstract

In this study, magnetic biosorbent from Spirulina microalgae were employed as adsorbent for Zinc (II) elimination. The adsorbent characteristics were examined employing scanning electron microscopy (SEM) and the Fourier transform infrared spectrum (FTIR). The consequence of adsorption parameters such as initial pH, contact time, temperature, the dosage of adsorbent, and initial metal ion concentration in the solution was evaluated employing a batch method. The optimal adsorbent for Zn(II) adsorption onto Spirulina microalgae (SM) and magnetic (MSM) were obtained at pH = 6, 0.03 g/L. An equilibrium time of and 10 min was necessary for the adsorption onto SM and MSM. Freundlich and Langmuir isotherm models were applied to investigate the adsorption equilibrium data. The kinetic of the pseudo-second-order confirms the elimination process of zinc ions onto adsorbents. The high adsorption capacity of Zn(II) ion onto SM and MSM was 500 mg/g.