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Cross-section backscattered electron images of (A) HKUST-1– and (B) ZIF-67–alginate composites and their corresponding EDX elemental maps (scale bar of 60 μm). (C) Chemical composition of sodium alginate, HKUST-1, and ZIF-67. Schematic of the formation of (D) the HKUST-1–alginate composite, (E) the ZIF-67–alginate composite, and (F) the “egg-box” model of metal ion cross-linked alginate [159]. Reprinted with permission from Ref. [159]. Copyright American Chemical Society, 2016.
