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(a) Zeta potential (mV) of CCN, Alg, and CCN/Alg hydrogel beads. (Reprinted from Ref. [156], with permission from Elsevier), and (b) zeta potential of hydrogel beads varies as a function of pH, showing that negatively charged selenium absorbs at lower pH. (Reprinted from Ref. [158]. Copyright 2022 American Chemical Society).
