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Novel asymmetric microporous polyethersulfone (PES)/polyvinyl alcohol-graphene oxide-sodium alginate (PVA-GO-NaAlg) nanocomposite hydrogel (HG) blended nanofiltration membranes with preferable characteristics were fabricated with the phase inversion induced by immersion precipitation technique. The hydrophilic PVA-GO-NaAlg nanocomposite hydrogel with carboxyl, hydroxyl, carboxylate ions and epoxy groups was in situ formed by chemical crosslinking in presence of the saturated boric acid and CaCl₂ curing solution and characterized with SEM, XRD and FTIR analyses. Distinct quantities of the nanocomposite hydrogel were applied in the PES doping solutions for modifying membrane characteristics and the results were compared by pristine PES and PES/polyvinyl pyrrolidone (PVP) membranes. The prepared membranes characterization was performed using SEM, AFM, ATR-FTIR, water contact …