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. 2022 Apr 22;8(5):263. doi: 10.3390/gels8050263

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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) CMC hydrogel, (b) CMC/PAM composite hydrogel, and (c) CMC/PAM composite hydrogel after the adsorption of Cu²⁺. (Reprinted from Ref. [92], Copyright (2022), with permission from Elsevier).