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Abstract
In this study, unmodified biosorbent was obtained from Arachis hypogea husk and applied to remove hexavalent chromium [Cr(VI)] from aqueous media through batch technique. The independent variables (contact time, pH of the solution and initial Cr(VI) concentration) influencing the adsorption process were optimized by central composite design (CCD) found in response surface methodology of the Design-Expert software 12.0.0 at a fixed temperature of 30 ± 0.5 °C. Furthermore, equilibrium sorption isotherms and kinetics studies were also investigated. The ANOVA component of the CCD indicated that all the process independent variables investigated had significant impacts on the sorption capacity of Cr(VI) by Arachis hypogea husk. The obtained experimental data showed that at the optimized 120 min contact time, 8.0 pH of the aqueous solution and 50 mg/L initial Cr(VI) concentration resulted in an optimum adsorption capacity of 2.355 mg/g. Equilibrium sorption isotherm and kinetic studies showed that Redlich–Peterson adsorption isotherm and pseudo-second-order kinetic models fitted well to the equilibrium data. The unmodified adsorbent from Arachis hypogea husk was found to be efficient for Cr(VI) decontamination from the aqueous media.
Highlights
Toxic heavy metals are often released into the ecosystem through agricultural and industrial activities and spread into the natural environment, and their presence in the environment may be harmful to people, plants and animals
The purpose of the current study is to explore the optimum operating conditions for adsorption of Cr(VI) from aqueous media onto unmodified Arachis hypogea husk
This implied that the Arachis hypogea husk used for the decontamination of Cr(VI) was of quality and there was no interference of moisture with the process, the higher the Cr(VI) uptake onto the Arachis hypogea husk
Summary
Toxic heavy metals are often released into the ecosystem through agricultural and industrial activities and spread into the natural environment, and their presence in the environment may be harmful to people, plants and animals These inorganic micro-pollutants are nonbiodegradable, extremely toxic and have a carcinogenic consequence and other healthrelated problems (Cimino et al 2000). Cr(VI) regarded to be the most lethal of chromium is readily mobile, a strong oxidizing agent, and has the ability to be absorbed via the skin (Park and Jung 2001) It is capable of being accumulated in water, soil, plants and living tissues, becoming concentrated throughout the food chain (Bayuo et al 2019a, b, c)
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