采用化学共沉淀法制备Fe3O4磁流体,再与斜发沸石复合制备一系列不同Fe3O4载量的磁性斜发沸石,并进行X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、振动样品磁强计(VSM)等表征分析,测定了其磁分离回收率及Cu2+、Zn2+、Cd2+的饱和交换吸附量.结果表明,Fe3O4微粒赋存于斜发沸石表面或相互聚集,磁性斜发沸石磁稳定性好,并具有良好的超顺磁性,其对Cu2+、Zn2+、Cd2+的交换吸附性能与其所含斜发沸石相当,但随Fe3O4载量增加而降低.Fe3O4载量为25wt%时,其饱和磁化强度Ms、剩余磁化强度Mr分别为14.787和0.398A·m2/kg,磁分离回收率为94.6%,Cu2+、Zn2+、Cd2+的饱和交换吸附量分别为12.3、12.0和23.4mg/g.磁性斜发沸石经磁分离回收并放置于空气中100d后仍保持良好的超顺磁性和较高的磁分离回收率.
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 Xray diffraction (XRD), scanning electronic microscope (SEM), transmission electronic microscope (TEM) and vibration sample magnetometer (VSM). The magnetic recovery rate and saturation exchangeadsorption 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 exchangedsorption 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 exchangeadsorption 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.
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