Abstract
he contamination of aquatic bodies by heavy metals is a growing environmental problem, making more critical the study and development of new technologies and materials that can be used for the removal of this type of pollutants. Thus, adsorption arises using residual materials as a sustainable alternative for the solution to this problem. In the present study, the use of plantain peels in the adsorption of Cr (VI) in a batch system is proposed, establishing the kinetics of the process at different temperature conditions, particle size and amount of adsorbent. The fit of the data was done using the theoretical models of pseudo-first-order, pseudo-second-order and Elovich. From the data, it is established that the pseudo-second-order and Elovich models show a better adjustment, so that the adsorption in the material occurs on two adsorption sites and that such process is related to chemical adsorption. The maximum adsorption capacity of Cr (VI) was found at a condition of 0.0306 g, 0.6775 mm and 55°C at a time of 420 min establishing the efficient use of plantain peels for the removal of the ion metallic in the studio.
Highlights
One of the main challenges many countries around the world are facing is the decrease in the supply of safe and clean drinking water
The effect of temperature, adsorbent dose and particle size of the Cr (VI) removal process was evaluated using plantain peel as a biosorbent on the adsorption kinetics; it was found that the adsorption of the ions is rapid in the first minutes
The research concluded that the particle size has no significant effect on the process, at 40 and 55◦C greater contaminant elimination capacity is achieved as the amount of adsorbent decreases, and at 70◦C the adsorption capacity increases as the biosorbent dose is increased
Summary
One of the main challenges many countries around the world are facing is the decrease in the supply of safe and clean drinking water. Cr (VI) can exist in the form of dichromate (Cr2O72−), hydrochromate (HCrO4−) or chromate (CrO42−) depending on the pH and redox potential of the medium [6]. The treatment of these effluents is necessary because, in humans, Cr (VI) causes lung cancer, ulcers, perforations of the nasal septum and damage to the kidneys and liver [7]. Various physicochemical methods are used for the removal of heavy metals from aqueous solutions such as solvent extraction [8], ion exchange [9], chemical precipitation [10], reverse osmosis [11], and membrane separation [12]. The development of efficient and low-cost separation processes is, of great importance
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