Preparation of Functionalized Fe₃O₄ Magnetic Particles and Evaluation of Its Potency in Separating Strontium(Ⅱ)

Amino-modified silicacoated ferromagnetic particles coated with benzo-18-crown-6 by condensation reaction have been evaluated for the application in the separation of strontium from aqueous solution. Its structure was analyzed by FTIR, TEM, XRD and VSM. The effect of contact time, temperature and Sr²⁺ mass concentration on the uptake of Sr²⁺ was systematically studied. The result indicates that the equilibrium can be reached within 60 min. The K_d value increases with the elevated temperature and decreased concentration of Sr²⁺. The adsorption agrees well with Freundlich adsorption equation and the pseudo-second rate equation. The desorption studies demonstrate the possibility of particles recycling.