Polymeric membranes have emerged as a promising solution for the removal of heavy metals from wastewater, offering an efficient an‎d environmentally friendly alternative to conventional treatment methods. Their advantages, such as low operational cost an‎d energy consumption, have made them highly appealing for industrial applications. However, achieving membranes with a balanced combination of high permeability, selec‎tivity, an‎d chemical an‎d mechanical stability remains a key challenge. In this work, poly(vinyl chloride) (PVC) membranes were fabricated using E6834-grade PVC sourced from Arvan‎d Petrochemical Company. To enhance membrane performance, ZIF-8 nanoparticles—a type of metal-organic framework—were synthesized at room temperature using 2-methylimidazole an‎d zinc nitrate hexahydrate in methanol. The nanoparticles were characterized by XRD, FTIR, BET, an‎d FE-SEM. Mixed matrix membranes containing different ZIF-8 loadings were prepared using the NIPS method. Structural an‎d performance changes due to ZIF-8 incorporation were studied through FTIR, AFM, FE-SEM, EDX, water contact angle, pure water flux, tensile strength, an‎d porosity analyses. The addition of 0.75 wt% ZIF-8 led to a notable increase in water flux, reaching 543.3 Kg/(m²•h), compared to 126.5 Kg/(m²•h) in the pristine membrane. Static an‎d dynamic adsorption tests using Cu(II)-contaminated feed revealed that the 0.75 wt% ZIF-8 membrane achieved up to 92% copper removal. The adsorption behavior followed the Langmuir isotherm, suggesting monolayer adsorption on a uniform surface. Membrane regeneration was successfully performed using an acid solution (pH 3), followed by clean water an‎d copper solution filtration cycles. Among all tested membranes, the one with 0.75 wt% ZIF-8 demonstrated the best overall performance for copper ion removal.

افسانه فخار , سهيل ضرغامي

احمد محب , محسن محمدي