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Abstract

SummaryRemoval of Cu 2+ from aqueous solution by onion skin and garlic skin was studied as a function of various experimental parameters. FTIR analysis and Boehm titration were used to identify and estimate the surface functional groups. Point of zero charge for the onion and garlic skin was between 4.25 to 4.45 and 4.55 to 4.75 respectively. Compared to garlic skin (66.7 mg/g), the maximum adsorption capacity of onion skin (76.9 mg/g) was slightly higher (pH = 5.3, T = 303K). The pseudo second order kinetic model fitted the batch data adequately. The rate constant for onion and garlic scale in the absence of diffusional resistance was estimated to be 0.07 and 0.075 mg/g/min respectively at 303 K. The thermodynamic studies showed that the Cu 2+ adsorption on the onion and garlic skin was spontaneous and endothermic.

Onion Peel: A Promising, Economical, and Eco-Friendly Alternative for the Removal of Divalent Cobalt from Aqueous Solutions

“…The band at 1227 cm −1 corresponds to the C-O stretching frequency of the ethers, and the bands at 1178 cm −1 and 1004 cm −1 to the signals inside and outside the C-H plane and to the stretching frequency of the C-O bonds in the carbohydrates, respectively. Below 800 cm −1 is the fingerprint signal of the biomaterial [62,83,85,86,105,107].…”