Journal of Industrial and Engineering Chemistry, Vol.20, No.4, 1227-1230, July, 2014
Preparation and characterization of merlinoite for potassium extraction from seawater
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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.
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