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(a) Surface and (b) core morphology of 0A, 0B, 0C, 70A, 70B, and 70C chitosan–cellulose hydrogel beads with a scale bar of 1 μm. (A) Acetic acid, (B) HCl, and (C) H2SO4. 0 refers to 0% initial chitosan content, and 70 refers to 70% chitosan content in the composite.
