https://en.wikipedia.org/wiki/FDCA
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The effect of hydrogel 's paper on the Cu ( 2+ ) adsorption was researched . The CS-g-PAA hydrogel demonstrated a higher-ranking adsorption capacity compared to pristine CS , PAA hydrogel , and CS-g-P ( AA-co-AMPS ) hydrogels . The adsorption followed the Langmuir isotherm manakin , and the pseudo-second order kinetic model the CS-g-PAA hydrogel exhibited relatively high adsorption performances toward Cr ( 3+ ) , Co ( 2+ ) , Ni ( 2+ ) , Pb ( 2+ ) , and Zn ( 2+ ) . Metal ions adsorbed within CS-g-PA