Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE Schematic diagram of the homemade staggered-flow filtration system employed to assess the pure water permeability and contaminant separation performance of PTFE hollow fiber membranes before and after PDA/PAMAM modification.

ABSTRACT
This work aims to prepare a long-lasting, high-flux and hydrophilic PTFE hollow fiber membrane for treating highly polluted wastewater, using a dopamine (DA)-based co-deposition strategy. To study the effects of different generations of poly(amido-amine) (PAMAM), the mass ratio of DA/PAMAM, and the co-deposition time on the hydrophilicity properties of the membranes, hydrophilic coatings were prepared on the surface of PTFE hollow fiber membranes by co-deposition using DA and two generations of hyperbranched poly(amido-amine) (PAMAM) as substrates. The pure water flux and water contact angle of the modified membrane varied with mass ratio (DA/PAMAM) and time. Through the use of edible oil and bovine serum albumin (BSA) as simulated pollutants, the dynamic cross-flow contamination experiments demonstrated the enhanced resistance of the modified membranes to both protein and oil contamination. After strong acid (pH = 1), alkaline (pH = 13) and repeated rinsing, the modified membrane still maintained its hydrophilicity and stability. Overall, the modification process is simple, environmentally friendly and effective. Notably, the optimized MPDA/PAMAM membrane at a DA/PAMAM mass ratio of 1:1 presented the highest pure water flux of 2354.6 L·m−2·h−1, the lowest contact angle of 32.3°, and stable performance across pH 1–13, showing promising application potential in wastewater treatment with high pollution levels.