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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MDPI AG
2024-11-01
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| author | 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 |
| author_facet | 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 |
| author_sort | Andrés Gómez-Naranjo |
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| description | 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. |
| format | Article |
| id | doaj-art-cdeb29e2b6d84e2b8c4b08269ab8b10a |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj-art-cdeb29e2b6d84e2b8c4b08269ab8b10a2024-12-13T16:21:56ZengMDPI AGApplied Sciences2076-34172024-11-0114231085110.3390/app142310851Fixed-Bed Columns of Avocado (<i>Persea americana</i> Hass.) Seed and Peel Biomass as a Retainer for Contaminating MetalsAndrés Gómez-Naranjo0Cristina Mayorga-Naranjo1Pamela Y. Vélez-Terreros2Gabriela S. Yánez-Jácome3Augusto Oviedo-Chávez4Hugo Navarrete5Julio Vinueza-Galáraga6David Romero-Estévez7Escuela de Ciencias Químicas, Pontificia Universidad Católica del Ecuador, Quito 170505, EcuadorEscuela de Ciencias Químicas, Pontificia Universidad Católica del Ecuador, Quito 170505, EcuadorCentro de Estudios Aplicados en Química (CESAQ), Pontificia Universidad Católica del Ecuador, Quito 170505, EcuadorCentro de Estudios Aplicados en Química (CESAQ), Pontificia Universidad Católica del Ecuador, Quito 170505, EcuadorEscuela de Ciencias Químicas, Pontificia Universidad Católica del Ecuador, Quito 170505, EcuadorEscuela de Ciencias Biológicas, Pontificia Universidad Católica del Ecuador, Quito 170505, EcuadorEscuela de Ciencias Químicas, Pontificia Universidad Católica del Ecuador, Quito 170505, EcuadorCentro de Estudios Aplicados en Química (CESAQ), Pontificia Universidad Católica del Ecuador, Quito 170505, EcuadorThis 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.https://www.mdpi.com/2076-3417/14/23/10851biosorptionbio-adsorbentcadmiumdesorptionmercurymicro-scale process |
| spellingShingle | 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 Fixed-Bed Columns of Avocado (<i>Persea americana</i> Hass.) Seed and Peel Biomass as a Retainer for Contaminating Metals Applied Sciences biosorption bio-adsorbent cadmium desorption mercury micro-scale process |
| title | Fixed-Bed Columns of Avocado (<i>Persea americana</i> Hass.) Seed and Peel Biomass as a Retainer for Contaminating Metals |
| title_full | Fixed-Bed Columns of Avocado (<i>Persea americana</i> Hass.) Seed and Peel Biomass as a Retainer for Contaminating Metals |
| title_fullStr | Fixed-Bed Columns of Avocado (<i>Persea americana</i> Hass.) Seed and Peel Biomass as a Retainer for Contaminating Metals |
| title_full_unstemmed | Fixed-Bed Columns of Avocado (<i>Persea americana</i> Hass.) Seed and Peel Biomass as a Retainer for Contaminating Metals |
| title_short | Fixed-Bed Columns of Avocado (<i>Persea americana</i> Hass.) Seed and Peel Biomass as a Retainer for Contaminating Metals |
| title_sort | fixed bed columns of avocado i persea americana i hass seed and peel biomass as a retainer for contaminating metals |
| topic | biosorption bio-adsorbent cadmium desorption mercury micro-scale process |
| url | https://www.mdpi.com/2076-3417/14/23/10851 |
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