Acid stable thin-film composite membrane for nanofiltration prepared from naphthalene-1,3,6-trisulfonylchloride (NTSC) and piperazine (PIP)

▸ Acid stable NF membrane was developed by interfacial polymerization of NTSC and PIP. ▸ The NF membrane has a MWCO of 5000 Da and an attractive Na2SO4 rejection of 86.7 %. ▸ The rejection order of the NF membrane is MgCl2