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. 2021 Aug 28;26(17):5217. doi: 10.3390/molecules26175217

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© 2021 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/).

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Structures of a MOF based on Ca²⁺ and Cu²⁺ employed for gold recovery (left), and its gold recovery product (right). Reproduced with permission from [68].