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. 2021 Jan 8;13(2):208. doi: 10.3390/polym13020208

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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 (http://creativecommons.org/licenses/by/4.0/).

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UV–VIS spectra of dye solutions. (a) Spectra of MO solutions before the adsorption experiment (0 min; black line) and after 24 h (red line) of incubation with cryogel, (b) spectra of MB solutions before and after the experiment. Individual spectra of both measurements as individual spectra are shown in Appendix B, (c) spectra of 1:1 solutions containing both MO and MB before and after adsorption. All insets show cuvettes before (cuvette on the left) and after adsorption (cuvette on the right). (d) Photograph of cuvettes containing the MO/MB mixtures before (left) and after (right) the adsorption experiment.