Preparation of modified MFI (ZSM-5 and silicalite-1) zeolites for potassium extraction from seawater |
| |
| Affiliation: | 1. Universidade Federal do Rio de Janeiro, Escola de Química, Avenida Athos da Silveira Ramos 149, CT Bloco E, Cidade Universitária, 21941-909 Rio de Janeiro, RJ, Brazil;2. Universidade Federal do Rio de Janeiro, Instituto de Química, LACES, Avenida Athos da Silveira Ramos 149, CT Bloco A, Cidade Universitária, 21941-909 Rio de Janeiro, RJ, Brazil;3. Institute of Chemistry, UMR 7177, CHIMIE, University of Strasbourg, CNRS, 1 Rue Blaise Pascal, F-67000 Strasbourg Cedex, France;1. Department of Electronic Engineering, Chemistry and Industrial Engineering and CASPE-INSTM, University of Messina, 98166 Messina, Italy;2. Department of Environmental and Chemical Engineering, University of Calabria, 87036 Rende, Italy |
| |
| Abstract: | 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. |
| |
| Keywords: | MFI ZSM-5 Silicalite-1 Ion-exchange Potassium Seawater |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
