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A thin film nanocomposite nanofiltration (TFN–NF) membrane was prepared by interfacial polymerization between piperazine and trimesoyl chloride monomers and partially reduced graphene oxide (rGO)/TiO₂ nanocomposite as a hydrophilic modifier. The surface properties of the prepared NF membranes were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM) and water contact angle measurements. These analyses confirmed the improved hydrophilicity and the smoother surface of the modified membranes. Furthermore, the separation performance of the membranes was evaluated using 2000 mg/L of Na₂SO₄ and NaCl solutions tested by cross-flow filtration system. TFN membrane containing 0.005 wt.% rGO/TiO₂ presented the optimum separation performance, including 60.6 L/m² h water flux and 93.57% and 36.61% salt rejection of Na₂SO₄ and NaCl solutions …