Fig. 9From: Adsorption behavior of Cr(VI) by biomass-based adsorbent functionalized with deep eutectic solvents (DESs)Optical images: a original peanut shell and b DESs pretreated peanut shell; SEM images at different magnifications: c original peanut shell (3000×) and d DESs pretreated peanut shell (3000×)Back to article page