Preparation and Properties of Fe3O4/Clinoptilolite Magnetic Composite

Magnetic fluid of Fe3O4 was prepared via chemical coprecipitation method firstly, and then magnetic clinoptilolite with different loadings of Fe3O4 were prepared by clinoptilolite composited with magnetic fluid. The compositions were characterized by X-ray diffraction (XRD), scanning electronic microscope (SEM), transmission electronic microscope (TEM) and vibration sample magnetometer (VSM). The magnetic recovery rate and saturation exchange-adsorption capacity to Cu2+, Zn2+, and Cd2+ of magnetic clinoptilolite were also measured. The results show that Fe3O4 particles adhere to the surface of clinoptilolite particles or aggregate each other to magnetic particulate. Magnetic clinoptilolite is stable with good superparamagnetism. The saturation exchange-adsorption capacity to Cu2+, Zn2+, and Cd2+ are approximate with containing clinoptilolite, but decrease slightly along with the loadings of Fe3O4 increasing. When the loadings of Fe3O4 is 25 wt%, the saturation magnetization and remanence magnetization of magnetic clinoptilolite is 14.787, 0.398 A . m(2)/kg, magnetic recovery rate is 94.6%, and saturation ion exchange-adsorption capacity to Cu2+, Zn2+, Cd2+ is 12.3, 12.0, 23.4 mg/g, respectively. The magnetic recovered clinoptilolite still retain superparamagnetism and high magnetic recovery rate after exposed in ambient for 100d.