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Preparation of novel functional MER zeolite membrane for potassium continuous extraction from seawater

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Abstract

Merlinoite(MER) zeolite membranes were synthesized on the outer surface of porous α-alumina tubular support by in-situ hydrothermal synthesis method without organic template. The synthetic MER zeolite membranes (sample 1, sample 2 and sample 3) were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). The thickness of sample 2 without cracks is about 15 μm. The synthetic MER membrane which is mainly composed of Si, Al, O and K is typical merlinoite structure. The performance of sample 2 for potassium extraction in simulated seawater was researched by the membrane tube reactor. The continual ion-exchange reaction was carried out for 108 h at room temperature. The average exchange rate for K+ ion was 32.8% and the average rejection rates for Na+, Ca2+ and Mg2+ ions were 93.4, 98.4 and 98.2% respectively. So the MER zeolite membrane (sample 2) has preference selectivity for K+ ion and can be used as a potential inorganic membrane for potassium extraction from seawater.

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Acknowledgements

The authors thank the Natural Science Foundation of Shandong Province (ZR2016BM06) for financial support.

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Authors and Affiliations

  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

    Wu Chen, Qingyue Guo & Jin Hou

  2. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266100, China

    Chunpeng Yang

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  1. Wu Chen
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  2. Qingyue Guo
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  3. Chunpeng Yang
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  4. Jin Hou
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Corresponding authors

Correspondence to Chunpeng Yang or Jin Hou.

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Chunpeng Yang and Jin Hou have contributed equally.

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Chen, W., Guo, Q., Yang, C. et al. Preparation of novel functional MER zeolite membrane for potassium continuous extraction from seawater. J Porous Mater 25, 215–220 (2018). https://doi.org/10.1007/s10934-017-0435-9

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  • DOI: https://doi.org/10.1007/s10934-017-0435-9

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