Adsorption performance of Food Red 17 dye using an eco-friendly material based on Luffa cylindrica and chitosan

Luffa cylindrica (LC), a lignocellulosic material coveted for its versatility, was investigated to immobilize crosslinked chitosan and remove Food red 17 (FR17) dye from aqueous solutions. LC/chitosan was cross-linked with epichlorohydrin (LC/CS/EPIC) and glutaraldehyde (LC/CS/GLUT). LC/CS/GLUT and LC/CS/EPIC presented an adequate morphology for mass transfer, relevant functional groups for adsorption. Furthermore, FR17 dye adsorption was favored at pH 2. Pseudo-second-order and Sips models represented the kinetic and isotherm data satisfactorily. The adsorption process for both adsorbents was endothermic, spontaneous, and favorable. The maximum adsorption capacity for LC/CS/GLUT was 77.66 mg g(-1), and for LC/CS/EPIC was 43.01 mg g(-1) for dye FR17. Furthermore, when reused, the adsorbents remain at around 70% of their original capacities after six adsorption cycles. Thus, the materials prepared from Luffa cylindrica and chitosan resulted in promising eco-friendly adsorbents. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The study investigated the use of Luffa cylindrica as a material to immobilize crosslinked chitosan for the removal of FR17 dye from aqueous solutions. LC/CS/GLUT and LC/CS/EPIC showed suitable morphology for mass transfer and relevant functional groups for adsorption. LC/CS/GLUT exhibited a higher maximum adsorption capacity for FR17 dye.