Experimental study demonstrates enhanced solute rejection in slot-die coated bilayer membranes, highlighting sustainable fabrication pathways for water treatment.
Key Points
To fabricate and evaluate the performance of single-layer and polydopamine-modified bilayer PVDF-HFP membranes using eco-friendly solvent systems for water separation applications.
Fabricated membranes through nonsolvent-induced phase separation using green solvents (Rhodiasolv PolarClean and gamma-valerolactone) alongside polymers polysulfone and PVDF-HFP.
Employed doctor blade extrusion and scalable slot-die coating techniques, incorporating polydopamine as an interlayer adhesion agent in bilayer architectures.
Characterized structural morphology, contact angle, and tensile strength, and tested water permeability and rejection across feeds containing 100 ppm NaCl, 100 ppm CaCl2, and 100 ppm bovine serum albumin.
Polymer concentration and casting technique directly modulated membrane hydraulic permeability and solute rejection efficiency.
Slot-die coated bilayer membranes demonstrated the highest initial bovine serum albumin rejection among the evaluated configurations.