Adsorption of Cr6+ ion using activated Pisum sativum peels-triethylenetetramine

The adsorption of Cr6+ ions from water-soluble solution onto activated pea peels (PPs) embellished with triethylenetetramine (TETA) was studied. The synthesized activated TETA-PP biosorbent was further characterized by SEM together with EDX, FTIR and BET to determine the morphology and elementary composition, functional groups (FGs) present and the biosorbent surface area. The confiscation of Cr6+ ions to activated TETA-PP biosorbent was observed to be pH-reliant, with optimum removal noticed at pH 1.6 (99%). Cr6+ ion adsorption to activated TETA-PP biosorbent was well defined using the Langmuir (LNR) and the pseudo-second-order (PSO) models, with a determined biosorption capacity of 312.50 mg/g. Also, it was found that the activated TETA-PP biosorbent can be restored up to six regeneration cycles for the sequestration of Cr6+ ions in this study. In comparison with other biosorbents, it was found that this biosorbent was a cost-effective and resourceful agro-waste for the Cr6+ ion confiscation. The possible mechanism of Cr6+ to the biosorbent was by electrostatic attraction following the surface protonation of the activated TETA-PP biosorbent sites.

Automated summary

The adsorption of Cr6+ ions from water-soluble solution onto activated pea peels embellished with triethylenetetramine (TETA) was studied. The synthesized biosorbent was characterized for its morphology, elemental composition, functional groups, and surface area. The pH played a significant role in the removal of Cr6+ ions, with the highest removal observed at pH 1.6. The Langmuir and pseudo-second-order models were used to describe the adsorption process, and the biosorption capacity was determined to be 312.50 mg/g. The activated TETA-PP biosorbent showed potential for multiple regeneration cycles and was found to be a cost-effective and resourceful agro-waste for Cr6+ ion removal.