摘要
Modified nanosized MFI （ZSM-5 and silicalite- 1 ） zeolites were successfully synthesized by a hydrothermal method using aluminum isopropoxide and tetraethylorthosilicate as the raw materials, The synthetic zeolites were characterized by X-ray diffraction, energy dispersion spectroscopy, and scanning electron microscopy. The ZSM-5 and silicalite-1 zeolites exhibited ellipse-like and cubic columns, respectively. The K＋ ion-exchange equilibrium and ion-exchange capacity of the synthetic zeolites in seawater were investigated. The K＋ ion-exchange of synthetic zeolites was rapid and reached an ion-exchange balance in approximately 20 min. The K＋ ion-exchange capacity of ZSM-5 and silicalite-1 in seawater was 56,7 and 48.7 mg/g, respectively. The synthetic zeolites have high selectivity toward K＋, and therefore, they can be used to selectively extract potassium from seawater.
Modified nanosized MFI （ZSM-5 and silicalite- 1 ） zeolites were successfully synthesized by a hydrothermal method using aluminum isopropoxide and tetraethylorthosilicate as the raw materials, The synthetic zeolites were characterized by X-ray diffraction, energy dispersion spectroscopy, and scanning electron microscopy. The ZSM-5 and silicalite-1 zeolites exhibited ellipse-like and cubic columns, respectively. The K＋ ion-exchange equilibrium and ion-exchange capacity of the synthetic zeolites in seawater were investigated. The K＋ ion-exchange of synthetic zeolites was rapid and reached an ion-exchange balance in approximately 20 min. The K＋ ion-exchange capacity of ZSM-5 and silicalite-1 in seawater was 56,7 and 48.7 mg/g, respectively. The synthetic zeolites have high selectivity toward K＋, and therefore, they can be used to selectively extract potassium from seawater.
基金
The authors thank the Natural Science Foundation of Shandong Province （ZR2016BM06） for financial support.
