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In this study, polyethersulfone (PES) nanofiltration membranes were synthesized by blending of O-carboxymethyl chitosan/Fe₃O₄ nanoparticles via the phase inversion method. O-carboxymethyl chitosan bound Fe₃O₄ magnetic nanoparticles (CC–Fe₃O₄ NPs) were synthesized by the binding of carboxymethyl chitosan (CC) onto the surface of Fe₃O₄ magnetic nanoparticles via co-precipitating method. The modified membranes had considerably higher pure water flux and permeation compared to the unfilled PES membrane. Surface hydrophilicity of the modified membranes was improved due to water affinity improvement of the membrane surface. However, high content of CC–Fe₃O₄ NPs (> 0.5%) in the casting solution diminished membrane performance due to agglomeration of the nanoparticles in the polymer matrix. The antifouling properties of the membranes were evaluated by powder milk solution and …