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Ahmed, D. F.; Ella, A. A. A.; Naeim, S.; Mubarak, M. F.; Nassar, M. Y.; Adam, M. S. S.; Alfurayj, I.; Hammud, H. H.; Ayoup, M. S.; Masoud, E. M. Tannin-Functionalized Hierarchical Porous Biochar from Lignocellulosic Waste for Simultaneous NH₄⁺ and NO₃⁻ Adsorption in Complex Wastewater via Ion-Exchange Synergy and Surface Complexation. CR 2026, 7, 357-374.