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A new monomer of triamine incorporating triazine ring, 1,3,5-(tris-piperazine)-triazine (TPT), was synthesized to fabricate nanofiltrationmembranesvia interracial polymerization with Trimesoyl chloride (TMC) onpolysulfone(PSf) supporting membrane.The TPT-TMC/PSf membranes were characterized for compositional analysis byATR-IR spectroscopy, surface and cross morphologies by SEM, surface charge by zeta potential measurement.Results revealed that TPT-TMC/PSf composite membraneobtains thinner membrane thickness, smoother andmore negatively charged surface than the conventional polypiperazine amide nanofiltration membrane.Under theoptimum conditions, the permeation properties of the membranes were evaluated by the rejection andwater flux of different kinds of salts (NaCl, Na2SO4, MgCl2, MgSO4) and the TPT-TMC/PSf compositemembrane exhibits excellent salt rejections to dianions[Na2SO4 (99.6 %) > MgSO4(98.7%) >MgCl2 (68.6%)>NaCl(40.5%)], which is typical for negatively charged membrane.The acid resistance of the membranes was studied by the evaluation of membraneperformance before and aftersulphuric acid exposure.The TPT-TMC/Psfcompositemembrane exhibited considerable acid stability which is attributed to the presence ofthe triazine ring.