Journal
CHEMICAL ENGINEERING COMMUNICATIONS
Volume 209, Issue 10, Pages 1304-1315Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00986445.2021.1963960
Keywords
Crystal violet; argan nutshell; almond shell; desorption; regeneration; reusability
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Funding
- Laboratory of Applied Chemistry and Environment, Ibn Zohr University, Agadir, Morocco
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This study demonstrates the efficient desorption of crystal violet dye from adsorbed argan nutshell and almond shell using nitric acid as a desorbing agent, with excellent regeneration reusability for multiple consecutive adsorption-desorption cycles. The nitric acid solution at 0.1 M concentration was found to be the most effective eluent for desorbing CV from the adsorbents, with high desorption efficiency. Argan nutshell and almond shell show great potential as low-cost, eco-friendly adsorbents for the removal of CV in consecutive adsorption-desorption cycles.
This study reported the desorption of adsorbed crystal violet (CV) dye on the argan nutshell (ANS) and almond shell (AS) using nitric acid (HNO3) 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, HNO3, H3PO4, CH3COOH, NaOH, H2O, H2O (pH = 2), and H2O (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 HNO3 concentration (0.01-2 M) on the desorption of the CV from CV-ANS and CV-AS was studied. The HNO3 (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 degrees 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.
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