Fabrication an‎d Performance eva‎luation of a Photocatalytic PES Membrane Modified with MIL-100(Fe)/ZnO Nanocomposite

2/1/2027 12:00:00 AM

Organic pollutants, particularly dyes, are among the most important sources of contamination in aquatic environments, an‎d their presence in industrial effluents can lead to serious environmental consequences. In this study, a PES/PVP ultrafiltration membrane an‎d PES/PVP nanocomposite membranes modified with MIL-100(Fe) an‎d MIL-100(Fe)/ZnO were fabricated via the phase inversion method for the removal of methylene blue dye. The synthesized MIL-100(Fe) an‎d MIL-100(Fe)/ZnO nanoparticles were characterized using FESEM, XRD, an‎d BET analyses. To investigate the combined effects of structural an‎d operational variables an‎d to determine the optimal conditions, Design of Experiments (DoE) based on Response Surface Methodology (RSM) was employed. In the first stage, the influence of membrane structural parameters was examined, an‎d in the second stage, the effects of operating conditions including pH, methylene blue concentration, an‎d pressure on water permeation flux an‎d dye rejection were eva‎luated. The RSM results indicated an adequate fit of the statistical models an‎d their capability to predict the responses an‎d identify optimal conditions. The prepared membranes were further characterized by FESEM, AFM, contact angle measurement, an‎d porosity analysis. The results showed that the hydro‎philicity of the modified membranes increased compared with the pristine PES/PVP membrane, as evidenced by a decrease in water contact angle from 76.6° to 51.02°. Under the optimal operating conditions (3 bar, pollutant concentration of 55 ppm, an‎d pH 11), the optimized membrane composition (17 wt% PES, 2 wt% PVP, an‎d 1 wt% nanocomposite) achieved a pure water flux of 545.52 L•m-2•h-1 an‎d a dye rejection of 91.7%. Moreover, the modified membranes exhibited higher water flux an‎d rejection performance than the pristine membrane. Antifouling assessments also revealed that all nanocomposite membranes had higher flux recovery ratios than the pristine membrane, with the best antifouling performance observed for the optimized membrane (97.6%). In addition, photocatalytic tests demonstrated the effective performance of the modified membranes in pollutant removal under light irradiation an‎d confirmed a significant reduction in membrane fouling in the presence of MIL-100(Fe) an‎d MIL-100(Fe)/ZnO nanoparticles.

غشاهاي فوتوكاتاليستي , پلي‌اترسولفون , پلي‌وينيل‌پيروليدون , نانوكامپوزيت MIL-100(Fe)/ZnO , روش سطح پاسخ

Photocatalytic membranes , Polyethersulfone , Polyvinylpyrrolidone , MIL-100(Fe)/ZnO nanocomposite , Response surface methodology

Shabnam Yazdani

Alireza Hemmati