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This study describes the preparation and characterization of a polydopamine-coated UF membrane with in situ grown akageneite using a two-step mineralization process that employs NaOH for precipitation. This PAN-PDA-Ak/NaOH membrane showed superior phosphorus uptake capacity, higher wettability, and surface roughness compared to PAN-PDA-Ak/HCl membranes, which were fabricated using the conventional forced hydrolysis with HCl and at elevated temperatures. The Langmuir model accurately described isotherm data, indicating a homogeneous adsorbent surface with a maximum phosphorus uptake capacity of 10.4 mg P/g. Under dynamic filtration conditions using 0.3 bar pressure, the membrane removed over 64% of phosphorus from both single-contaminant and synthetic wastewater solutions. The PAN-PDA-Ak/NaOH membrane demonstrated a high affinity for phosphorus, excellent reusability …