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Preparation and characterization of merlinoite for potassium extraction from seawater
Na Jin,Jin Hou,Chunxia Meng 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The preparation of zeolites for potassium extraction was extensively investigated by hydrothermal method without organic template. The K+ ion-exchange capacities of synthetic zeolites in seawater were tested. Merlinoite with high ion-exchange capacity was successfully synthesized in the synthesis gel with the molar composition of 15K2O:12SiO2:Al2O3:570H2O. The K+ ion-exchange capacity of merlinoite is 58.7 mg/g in seawater, and therefore it can be used to extract potassium selectively from seawater. Merlinoite was characterized by X-ray diffraction, scanning electron microscopy and energy dispersion spectroscopy. Merlinoite crystal which is mainly composed of Si, Al, K and O exhibits a square pillar shape.