In this study, magnetic hydroxyapatite nanorods Sr5(PO4)3(OH)/Fe3O4, called FSP for short, with different magnetic contents were synthesized by one-step hydrothermal method. FSP materials were then investigated as effective adsorbents for adsorption of Pb2+ from aqueous solution. FSP materials with 2 wt% magnetic content (denoted as FSP2) exhibited high magnetic separation efficiency and Pb2+ removal capacity. Then, FSP2 were further characterized by SEM, EDS, XRD, PPMS, BET, and Zeta potential. FSP2 demonstrated a leaching rate of ∼5 % at pH 5, indicating excellent chemical stability in aqueous environments. Effects of two influence parameters (temperature and material dosage) were studied and the optimized adsorption conditions were 25 °C and material dosage of 0.05 g. The kinetic and isotherm data accorded with the pseudo-second-order kinetic model and Temkin model, respectively. The EDS and XRD results of mechanism study indicated that the adsorption of Pb2+ involves ion exchange and surface adsorption. Ion exchange Pb2+ for Sr2+ was predominant. The results of application research showed that the adsorption capacity of Pb2+ by FSP2 in environmental water samples was all higher than 600 mg g−1. Due to their easy preparation method and good adsorption capability, magnetic FSP2 are regarded as promising composite materials for the adsorption of Pb2+ from solutions.
CORE (COnnecting REpositories)
CORE (COnnecting REpositories)