A Low‐Cost Ionic Polymer for Rapid Removal of Hexavalent Chromium Ions From Aqueous Solutions

ABSTRACT This work reports a one‐pot synthesis of an ionic porous organic polymer (iPOP‐F) from ammonium fluoride and terephthalaldehyde for efficient remediation of Cr(VI) contamination. The obtained adsorbent exhibits rapid and high‐capacity sequestration of Cr(VI), reaching an uptake of 273.2 mg·g −1 within 5 min under optimized conditions (pH = 2, adsorbent dosage = 1 g·L −1 ). Kinetic investigations reveal that the adsorption process follows a pseudo‐second‐order model, consistent with a chemisorption‐dominated mechanism. Further investigations reveal that Cr(VI) uptake proceeds via a synergistic interplay of electrostatic attraction, ion exchange, and hydrogen bonding. Remarkably, iPOP‐F maintains over 95% removal efficiency after seven consecutive adsorption‐regeneration cycles, demonstrating excellent reusability and structural integrity. These findings position iPOP‐F as a robust, scalable adsorbent with strong potential for sustainable chromium‐contaminated water treatment.