Figure 5
From: Hierarchical Porous Chitosan Sponges as Robust and Recyclable Adsorbents for Anionic Dye Adsorption
(a) Digital images of the apparatus for RB removal by filtration and the RB solutions before and after filtration. A Ch-5 sponge is used as the adsorbent filtration membrane. The concentration of RB used is 20 mg/L. Feeding speed of RB solution is 0.5 mL/min. (b) UV absorption spectra of the RB solutions before and after filtration. (c) The RB adsorbed Ch-5 sponge in DI-water. (d) A 0.5 M NaOH solution after elution process. (e) The Ch-5 sponge in DI-water after elution by the 0.5 M NaOH solution. (f) Digital image of the apparatus for compression test under water and the Ch-5 sponge after 10,000 compression cycles. The inset shows a scheme of the compression test. (g) Recyclability test of a Ch-5 sponge (RB concentration: 100 mg/L).
