Abstract: 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dsorption 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 25wt%, the saturation magnetization and remanence magnetization of magnetic clinoptilolite is 14.787, 0.398 A·m²/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.

Key words: magnetic clinoptilolite, magnetic property, magnetic recovery rate, saturation exchange-adsorption capacity