A research group led by Prof. Wan Yinhua from the Institute of Process Engineering (IPE) of the Chinese Academy of Sciences has developed a robust, dually charged loose nanofiltration (NF) membrane for highly efficient dye/salt separation. The study was published in the Journal of Membrane Science on March 21.
source https://phys.org/news/2021-03-nanofiltration-membrane-highly-efficient-dyesalt.html