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Template-free synthesis and characterization of K-phillipsite for use in potassium extraction from seawater
Authors:Jin Hou  Junsheng Yuan  Jia Xu  Yunpeng Fu  Chunxia Meng
Institution:[1]Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100,China [2]Engineering Research Center of Seawater Utilization Technology, Ministry of Education, Hebei University of Technology, Tianjin 300130, China
Abstract:K-phillipsite was prepared using a hydrothermal method. Soluble glass and sodium aluminate were used as raw materials in the absence of an organic template. Investigations regarding the K+ ions were conducted at room temperature to determine the ion-exchange capacity in the seawater sample and the selectivity coefficient of the mixed K+–Na+ solution. The sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersion spectroscopy (EDS). The K+ ion-exchange capacity is 51 mg/g in seawater and the selectivity coefficient is 75.1 in the mixed K+–Na+ solution. The sample has a selectivity preference for K+, and therefore can be used to selectively extract potassium from seawater. The sample composed of Si, Al, K, Na, and O exhibits a cross-like shape and is a typical K-phillipsite structure.
Keywords:K-Phillipsite Template-free Potassium extraction Seawater
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