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(A) Ca2+ cross-linked GO-alginate composite beads(SA-GO-N); (B) Acid-gelled GO-alginate composite beads (SA-GO-M);(C) a SEM image of freezing-dry bead SA-GO-N; (D) a SEM image of the bead SA-GO-M; (E) naked-eye comparison of color changes upon dye-adsorbing beads (SA-GO-M and SA-GO-N) were immersed in the CaCl2 ~0.5 mol/L solution and deionized water. Adapted with permission from [119]. Copyright Elsevier, 2014.
