Preparation and characterization of Fe 3O 4/Y 2O 3 magnetic particle with nano-structure and its phosphate adsorption properties

Fe 3O 4/Y 2O 3, a novel magnetic adsorbent, was prepared by co-precipitation process and its properties were investigated. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis indicate that this adsorbent is formed with nano-structured fine particles with average primary particle size of 15.2 nm. The specific saturation magnetization is 38.7 emu·g -1 measured by vibrating sample magnetometer (VSM) and the isoelectric point is 6.8. Batch sorption experiment data is well fitted with Langmuir model (R 2=0.989) with maximal phosphate adsorption capacity of 60.6 mg·g -1 at 25°C and pH 5.0. The adsorption kinetic data is well described by pseudo-second order model (R 2=0.997) and over 80% of the equilibrium adsorption capacity is achieved within 120 min. The phosphate adsorption is dependent on solution pH, while ionic strength poses little effect. The effect of coexisting anions on phosphate adsorption on Fe 3O 4/Y 2O 3 increases in the order of Cl -更多