PDA / PAMAM Co‐Deposition for Hydrophilic Modification of PTFE Hollow Fiber Membranes

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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.

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