4.7 Article

High performance Mg2+/Li+ separation membranes modified by a bis-quaternary ammonium salt

期刊

DESALINATION
卷 526, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.desal.2021.115519

关键词

Nanofiltration membranes; Bis-quaternary ammonium salts; Lithium extraction; Mg2+/Li+ separation

资金

  1. National Natural Science Foundation of China [22178139]
  2. Huazhong University of Science and Technology [3004013118]
  3. Graduate Innovative Fund of Wuhan Institute of Technology [CX2020129]

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A modified polyethyleneimine (PEI) nanofiltration membrane using bis-quaternary ammonium salt (QEDTP) has been designed, which shows improved water flux and Mg2+/Li+ selectivity while maintaining high MgCl2 rejections. This modified membrane exhibits stable nanofiltration performance and provides one of the best Mg2+/Li+ separation performance considering both flux and selectivity.
The separation of lithium (Li+, 3.8 angstrom) and magnesium (Mg2+, 4.3 angstrom) ions represents the main challenge for lithium extraction from salt lakes with high magnesium-to-lithium (Mg2+/Li+) ratio. A bis-quaternary ammonium salt (abbreviated as QEDTP) was designed to modify Polyethyleneimine (PEI) polyamide nanofiltration membrane. Water flux of the modified PEI membrane is 126.9 +/- 1.6 L.m(-2).h(-1) (LMH) under 6 bar hydraulic pressure, which is 4.4 times as high as the pristine PEI membrane (25.8 +/- 0.3 LMH). Meanwhile, the MgCl2 rejections of both membranes are maintained >95%. Nanofiltration performance of the QEDTP membrane is stable in 180 h continuous nanofiltration test at 6 bar pressure. The water flux and Mg2+/Li+ selectivity (SMg2+/Li+) of the QEDTP modified membrane in filtrating 2000 ppm Mg2+/Li+ mixture (Mg2+/Li+ ratio: 120:1, 6 bar) are 112.9 +/- 1.6 LMH and 15.6 +/- 0.3, which is one of the best Mg2+/Li+ separation performance considering both the flux and selectivity.

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