▎ 摘　　要

In this study, the Met-GO@Alg as a novel adsorbent was composed of metformin (Met), graphene oxide (GO), alginate beads (Alg) for removal of lead ions from aqueous media. The adsorbent material was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) techniques. The effect of solution pH)5(, adsorbent dosage)20 mg(, contact time)90 min(, temperature and co-existing ions were studied and optimized. The Pb2+ adsorption nature and mechanism were adopted with various isotherms, kinetics, and thermodynamic models. Hence, the adsorption kinetic process fits with the pseudo-second-order model (R-2 > 0.97) with 95% removal efficiency at 90 min. The adsorption isotherm is well fit to the Freundlich model (R-2 > 0.99) with the maximum adsorption capacity of 370 mg. g(-1). Overall, Met-GO@Alg nanocomposite revealed good efficiency, applicability, and five times reusability.