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Optical microscopic images of an MX-SA4:20 (a) hydrogel sphere (3 mm), (b) following vacuum freeze-drying (~2 mm), (c) cross-sectional view, and (d) core of MX-SA4:20 spheres. SEM images of (e) Ti3C2Tx MXene, (f) dried MX-SA4:20 sphere, and (g) internal structure of sphere cross-section. (h) Kinetics of removal of Hg2+ from tap water by MX-SA4:20. (i) Adsorption isotherm of Hg2+ onto MX-SA2:20 and MX-SA4:20. Adapted and reproduced with permission from [62]. Copyright 2019 Elsevier.
