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Three different types of titanium dioxide (TiO₂) nanoparticles (P25, PC105 and PC500) with various sizes were applied for the preparation of mixed matrix polyethersulfone nanofiltration membranes. This work investigates the effect of types and sizes of TiO₂ on the morphology, performance and fouling control of nanofillers embedded membranes. The membrane characterization was carried out by FTIR, XRD, EDX, contact angle, surface and cross-section SEM images and pure water flux measurements. The surface hydrophilicity of the TiO₂ blended membranes was improved due to water affinity improvement of the membrane surface. The high content of PC105 and PC500 TiO₂ nanoparticles in the casting solution diminished membrane performance due to the agglomeration of these nanoparticles in polymer matrix. However, the P25 nanofillers showed better dispersibility. The antibiofouling performance of the …