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. 2022 Dec 5;27(23):8574. doi: 10.3390/molecules27238574

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

(A) The preparation principle of PEC hydrogels by the SD-A-SGT method (the example of SL/CS hydrogels) (Reprinted with permission from Ref. [72]. Copyright 2020, Elsevier.) (B) The effect of SL/LCS PEC hydrogels composition (SC1: SL/LCS = 5/5; SC2: SL/LCS = 6/4; SC3: SL/LCS = 7/3; SC4: SL/LCS = 8/2) on Ni(II) sorption (Reprinted with permission from Ref. [73]. Copyright 2020, Elsevier.) (C) The effect of SL/CMCS PEC hydrogels composition on Pb(II) sorption (Reprinted with permission from Ref. [74]. Copyright 2020, Elsevier.) (D) The effect of competing ions on Pb(II) sorption by the SL/CMCS PEC hydrogels (SL/CMCS = 6/4) (Reprinted with permission from Ref. [74]. Copyright 2020, Elsevier.) (E) Reusability efficiency in Pb(II) successive sorption/desorption cycles by the SL/CMCS PEC hydrogels (SL/CMCS = 6/4) (Reprinted with permission from Ref. [74]. Copyright 2020, Elsevier.).