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Tuning composite removal capacity. (Top) N2 adsorption and desorption isotherms for Fe-BTC (red) and several Fe-BTC/PDA composites with 19 (blue), 28 (purple), 38 (green), and 42 (yellow) mass % loading of PDA. The polydopamine loading level provides tunability of the (middle) Hg2+ and (bottom) Pb2+ removal capacity.
