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This study reported the desorption of adsorbed crystal violet (CV) dye on the argan nutshell (ANS) and almond shell (AS) using nitric acid (HNO 3 ) as a desorbing agent and their reusability to remove the CV in multiple consecutive adsorption-desorption cycles. The prepared adsorbents were characterized using FTIR and SEM analysis. Different desorbing agents (HCl, HNO 3 , H 3 PO 4 , CH 3 COOH, NaOH, H 2 O, H 2 O (pH = 2), and H 2 O (pH = 11)) were tested to determine the best eluent. The effect of experimental parameters, such as CV-adsorbent dose (4–40 g L −1 ), contact time (0–180 min), and HNO 3  concentration (0.01–2 M) on the desorption of the CV from CV-ANS and CV-AS was studied. The HNO 3  (0.1 M) solution was an excellent eluent for the CV desorption from CV-ANS (98.21%) and CV-AS (98.60%) using 16 g L −1  of CV-adsorbent dose at 23 ± 1 °C for 60 min. The pseudo-second-order kinetic model well-exemplified experimental data. Excellent regeneration reusability of ANS and AS for the CV removal for six consecutive adsorption–desorption cycles. This study showed that argan nutshell and almond shell as low-cost adsorbents have tremendous potential for removing the CV in multiple consecutive adsorption-desorption cycles as an alternative eco-friendly process.

Regeneration of argan nutshell and almond shell using HNO 3 for their reusability to remove cationic dye from aqueous solution