Magnetic EDTA Functionalized Preyssler Cross Linked Chitosan Nanocomposite for Adsorptive Removal of Pb(II) Ions

In this study, the magnetic ethylenediaminetetraacetic acid (EDTA) modified Preyssler/chitosan/Fe₃O₄ nanoparticles composite (EDTA-PCF) was introduced as a novel adsorbent for Pb(II) ions removal from aqueous solutions. The characterization study of the prepared EDTA-PCF was carried out by Fourier transform infrared spectrometer (FTIR), scanning electron microscopy (SEM) and N₂ adsorption-desorption isotherms. The adsorption activity of EDTA-PCF was evaluated by the effect of adsorbent dosage, pH and contact time on the Pb(II) ions removal. The optimum values for adsorbent dosage and pH were 1.2 g/L and 5.3, respectively (>99% removal efficiency for [Pb²⁺] = 10 mg/L). In addition, the kinetic study was carried out using pseudo-first order, pseudo-second order, Bangham, Elovich, and Weber and Morris models and also the Langmuir, Freundlich, and Temkin isotherm models were applied for isothermal study. The results revealed that the pseudo-second-order rate model and Langmuir adsorption model can well describe the adsorption process of Pb(II) ions onto EDTA-PCF. The Weber and Morris model proposed that film and intra-particle diffusion were involved in this adsorption process. The maximum adsorption capacity of Pb(II) onto EDTA-PCF was estimated to be 25.9 mg/g at 25°C.