Cu, Cr, and Ni in mono- and multi-component aqueous solution adsorbed in passion fruit peels in natura and physicochemically modified: a comparative approach.

Among the low-cost adsorbent are agricultural residues, which can be used in natura or modified forms. This work evaluated the adsorption of Ni, Cu, and Cr in mono- and multi-component aqueous solutions using passion fruit peels in natura (Nat-PF) and physicochemically modified (Mod-PF). The adsorption was investigated by kinetic and isotherm models.

Activated carbons from passion fruit shells in adsorption of multimetal wastewater.

This work aims to use a solid agro-industrial residue (passion fruit shells-PF) to manufacture different activated carbons (ACs) capable to retain Cr, Cu, and Ni on synthetic wastewater. The PF was carbonized and chemically activated with three precursors, giving rise to three ACs: phosphoric acid ([Formula: see text]), sodium acetate ([Formula: see text]), and potassium hydroxide (AC). The ACs were characterized by SEM, ASAP, FTIR, and pH-PZC.