Extreme Li-Mg selectivity via precise ion size differentiation of polyamide membrane

Abstract Achieving high selectivity of Li + and Mg 2+ is of paramount importance for effective lithium extraction from brines, and nanofiltration (NF) membrane plays a critical role in this process. The key to achieving high selectivity lies in the on-demand design of NF membrane pores in accordance with the size difference between Li + and Mg 2+ ions, but this poses a huge challenge for traditional NF membranes and difficult to be realized. In this work, we report the fabrication of polyamide (PA) NF membranes with ultra-high Li + /Mg 2+ selectivity by modifying the interfacial polymerization (IP) process between piperazine (PIP) and trimesoyl chloride (TMC) with an oil-soluble surfactant that forms a…

• NN
  National Natural Science Foundation of China

  Awards: 21988102, 2022YFB3805900
• GO
  Government of Jiangsu Province
• NK
  National Key Research and Development Program of China

  Award: 2022YFB3805900