ساخت و بررسي عملكرد غشاي زمينه مركب اولترافيلتراسيون پلي (وينيل كلرايد) داراي كربن نيتريد گرافيتي (g-C3N4) براي جداسازي امولسيون روغن در آب

In this study, graphitic carbon nitride (g-C₃N₄) nanocomposite was employed to fabricate polyvinyl chloride (PVC) ultrafiltration (UF) mixed matrix membranes (MMMs) including graphitic carbon nitride (g-C3N4) in order to obtain hydro‎philic MMMs with antifouling properties for oil-in-water emulsion separation. The primary objective of this modification was to improve membrane efficiency in diesel-in-water emulsion separation using the UF process. Subsequently, the MMMs were further modified using a hybrid magnetic nanocomposite an‎d fabricated both in the presence an‎d absence of an external magnetic field. Membrane characterization was conducted using FTIR, AFM, EDX, FESEM, water contact angle (WCA) measurements, an‎d diesel-in-water emulsion filtration tests. The formation of a metallic hybrid nanocomposite (NiFe₂O₄/g-C₃N₄) an‎d its incorporation into the membrane structure at different loadings significantly enhanced membrane performance an‎d imparted strong antifouling properties. For the g-C₃N₄-modified membrane, the values of total fouling resistance (Rt), flux recovery ratio (FRR), irreversible fouling resistance (Rir), an‎d reversible fouling resistance (Rr) were 75%, 75.2%, 25%, an‎d 50.2%, respectively, compared to 26.2%.,81%, 73.8%, an‎d 7.5% for the pristine PVC membrane. Moreover, the pure water flux (PWF) of the modified membrane increased by 253% relative to the base PVC membrane, while diesel-in-water emulsion separation efficiency reached 97%, exceeding that of the pristine membrane (95.1%). Further modification using the hybrid nanocomposite (NiFe₂O₄/g-C₃N₄) an‎d fabricated of membranes in the absence of a magnetic field resulted in a reduction of membrane pore size to 17.43 nm, with Rt, FRR, Rir, an‎d Rr values of 86.4%, 65.5%, 13.6%, an‎d 51.9 % respectively. Also, membrane fabrication under an external magnetic field led to significant surface modification, yielding Rt, FRR, Rir, an‎d Rr values of 91.8%, 46.2%, 8.2%, an‎d 38%, respectively. Notably, the oil–water filtration process demonstrated a remarkable increase of 1056% in water flux compared to the pristine PVC membrane. Additionally, the obtained MMM exhibited a substantial reduction in fouling parameters an‎d achieved an enhanced diesel-in-water emulsion separation efficiency of up to 99.1%.

سهيل ضرغامي

مهدي بازرگاني پور

احمد محب , افسانه فخار