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Polyethersulfone (PES)-based mixed matrix nanofiltration membrane was developed by blending with partially reduced graphene oxide (rGO)/TiO₂ nanocomposite. The effect of rGO/TiO₂ contents on the morphology and performance of the prepared membranes was investigated by scanning electron microscopy (SEM), energy dispersive X-ray (EDX), atomic force microscopy (AFM) and water contact angle analysis. The blended membranes displayed improved water permeability and fouling resistance compared to the bare PES. When the content of rGO/TiO₂ was 0.15 wt.%, the water flux reached a maximum value (45.0 kg/m² h) nearly twice of that of the bare PES membrane (23.1 kg/m² h). Fouling resistance of the membranes studied by bovine serum albumin (BSA) solution filtration showed that 0.1 wt.% rGO/TiO₂ membrane had the best antifouling property. Nanofiltration performance of the prepared …