利用氨基表面修饰的硅胶包覆磁粒子与4-羧基苯并18-冠醚-6的缩合反应,将冠醚连接到磁粒子表面,制得了用于分离Sr2+的新型磁纳米粒子吸附剂B18C6/Fe3O4.分别用FTIR、TEM、XRD、VSM对其结构进行了表征;研究了时间、温度、Sr2+质量浓度对分离效果的影响.结果表明:在60 min内,B18C6/Fe3 O4对Sr2+的吸附达到平衡,75℃时分配系数Kd=5 000 mL/g,Kd值随着温度的降低、酸度的增大及Sr2+浓度的增大而减小;吸附较好地符合Freundlich等温方程及准二级动力学方程.磁粒子的解吸实验证明其具有再生利用的性能.%Ammo-modified silica-coated 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 SrJ+ mass concentration on the uptake of Sr2+ was systematically studied. The result indicates that the equilibrium can be reached within 60 min. The Kd value increases with the elevated temperature and decreased concentration of Sr2+. The adsorption agrees well with Freundlich adsorption equation and the pseudcrsecond rate equation. The desorption studies demonstrate the possibility of particles recycling.
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