磁性沸石的制备与表征及其对Pb2+的吸附性能

通过氨基甲酸乙酯的粘结作用使天然沸石与Fe3O4结合，制备了具有吸附和磁性能的沸石复合体. 利用XRD, SEM, 氮吸附等温线和振动样品磁强计等对所制磁性沸石进行了表征. 结果表明，与钠型沸石相比，磁性沸石的结构没有发生明显改变，比表面积由25.13 m2/g增至38.01 m2/g. 磁性沸石和钠型沸石对模拟废水中Pb2+的平衡吸附量分别为54.53和66.99 mg/g，两者对Pb2+的吸附符合Langmuir型液相吸附，其单层饱和吸附量分别为50.89和65.92 mg/g.

Preparation, Characterization and Adsorption to Pb2+ of Magnetically Modified Zeolite

A composite of natural zeolite with magnetite was prepared by urethane coating. The magnetically modified zeolite (MMZ) was characterized by XRD, SEM, nitrogen adsorption isotherms, and magnetization measurements. The results showed that the structure of MMZ did not manifestly change, compared with the Na-zeolite, and the BET specific surface area increased from 25.13 m2/g for the Na-zeolite to 38.01 m2/g for the MMZ. The adsorption properties of Pb2+ on both zeolites were studied. The equilibrium adsorption capacities on the MMZ and Na-zeolite were 54.53 and 66.99 mg/g, respectively. The adsorption data of Pb2+ on the MMZ and Na-zeolite fitted the linearized Langmuir equation reasonably well, and the monolayer maximum sorption capacities were 50.89 and 65.92 mg/g, respectively.