Equilibrium isotherm investigation on the sequestration of ciprofloxacin from solution via adsorption onto yam peel powder

Abstract

In this work, the adsorption of ciprofloxacin onto yam peel biosorbent was studied by batch method. The equilibrium isotherm analysis of the adsorption process was evaluated to provide insight into the removal mechanism. A decrease in the percentage removal (75.0 – 60.8%) and an increase in adsorption capacity (6.0 – 24.3 mg/g) with an increase in ciprofloxacin concentration from 20 – 100 mg/L was obtained. The isotherm was analyzed by the Langmuir, Temkin, Freundlich, and Scatchard models, and the best fit was obtained for the Freundlich model with a R2 of 0.9918. The separation factor in the range of 0.238 – 0.609 and the Freundlich adsorption intensity of 1.492 indicated a favorable adsorption of ciprofloxacin on yam peel. A monolayer adsorption capacity of 42.81 mg/g was obtained for yam peel which was higher than other efficient adsorbents. The Scatchard model gave a linear fit to the uptake data with R2 of 0.9653 and sum square error of 0.008. The isotherm analysis revealed complex adsorption involving multi mechanisms in the overall process. The results of this investigation showed that yam peel could be utilized as an efficient agricultural waste for the adsorption of ciprofloxacin from wastewater.

Adsorptive decolorization of dyes in aqueous solution using magnetic sweet potato (Ipomoea batatas L.) peel waste

“…Some of the studied low-cost adsorbents for the adsorption of aqueous dyes and other water contaminants include nonliving moss, 14,16 Moringa oleifera seed waste, 3,17 sweet potato peel, 18 banana peel, 19 Nauclea diderrichii seed biomass, 20 yam peel, 21 and tamarind fruit shell. 22 One major advantage of employing low-cost or agricultural materials and unwanted domestic wastes is that it eliminates or reduces the undesirable effects of these wastes on the environment.…”

“…For instance, yam (Dioscorea spp) and sweet potato (Ipomoea batatas L.) are common staples in sub-Suhara Africa, and large amounts of waste (millions of tonnes) are generated from their peels. 18,21 The bulk of these wastes may not be used in other applications, and constitute a nuisance in the environment. Thus, using these wastes as biosorbents for water treatment is cheap and would improve the aesthetics of the environment.…”