Fixed-Bed Columns of Avocado (<i>Persea americana</i> Hass.) Seed and Peel Biomass as a Retainer for Contaminating Metals

Fixed-Bed Columns of Avocado (<i>Persea americana</i> Hass.) Seed and Peel Biomass as a Retainer for Contaminating Metals

This study evaluated the adsorbent capacity of the Ecuadorian avocado (<i>Persea americana</i> Hass.) seed and peel wastes as an alternative method for cadmium (Cd), mercury (Hg), lead (Pb), and nickel (Ni) ion removal from aqueous solutions. The laboratory microscale process was perform...

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Main Authors: Andrés Gómez-Naranjo, Cristina Mayorga-Naranjo, Pamela Y. Vélez-Terreros, Gabriela S. Yánez-Jácome, Augusto Oviedo-Chávez, Hugo Navarrete, Julio Vinueza-Galáraga, David Romero-Estévez
Format: Article
Language:English
Published: MDPI AG 2024-11-01
Series:Applied Sciences
Subjects:
biosorption
bio-adsorbent
cadmium
desorption
mercury
micro-scale process
Online Access:https://www.mdpi.com/2076-3417/14/23/10851
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Summary:This study evaluated the adsorbent capacity of the Ecuadorian avocado (<i>Persea americana</i> Hass.) seed and peel wastes as an alternative method for cadmium (Cd), mercury (Hg), lead (Pb), and nickel (Ni) ion removal from aqueous solutions. The laboratory microscale process was performed using fixed-bed columns containing 1 g of 600 μm particles of biomaterial pretreated with ethanol and ethylene glycol. Subsequently, metal solutions of different concentrations were eluted and measured by flame atomic absorption spectroscopy. Results showed that fixed-bed columns allow efficient adsorption of Pb (2.6 mg/g) with ethanol pretreatment. Lower adsorption capacity was achieved for Cd, Hg, and Ni ions. Favorable adsorption with high retention capacity was found for Pb<sup>+2</sup> for the ethanol pretreated bio-adsorbent at higher concentrations (120 mg/L). Lower removal percentages were found for Cd<sup>+2</sup>, Hg<sup>+2</sup>, and Ni<sup>+2</sup>; Ni showed the lowest adsorption capacities and negative R<sub>L</sub> values, suggesting inefficient adsorbent development. Regeneration of Cd, Hg, and Pb ions from avocado peel and seed showed the highest recovery when 1 mol/L HCl solution was used. Regarding the adsorption isotherms, the Langmuir model was the one that best fit our data, demonstrating that adsorption takes place in a uniform monolayer and that each contaminant ion occupies a single site.
ISSN:2076-3417

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