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Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study

The remediation of arsenic contamination in potable water is an important and urgent concern, necessitating immediate attention. With this objective in mind, the present study investigated arsenic removal from water using batch adsorption and fixed-bed column techniques. The material employed in thi...

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Autores principales: Vancea, Cosmin, Mladin, Georgiana, Ciopec, Mihaela, Negrea, Adina, Duteanu, Narcis, Negrea, Petru, Mosoarca, Giannin, Ianasi, Catalin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10611127/
https://www.ncbi.nlm.nih.gov/pubmed/37888699
http://dx.doi.org/10.3390/toxics11100849
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author Vancea, Cosmin
Mladin, Georgiana
Ciopec, Mihaela
Negrea, Adina
Duteanu, Narcis
Negrea, Petru
Mosoarca, Giannin
Ianasi, Catalin
author_facet Vancea, Cosmin
Mladin, Georgiana
Ciopec, Mihaela
Negrea, Adina
Duteanu, Narcis
Negrea, Petru
Mosoarca, Giannin
Ianasi, Catalin
author_sort Vancea, Cosmin
collection PubMed
description The remediation of arsenic contamination in potable water is an important and urgent concern, necessitating immediate attention. With this objective in mind, the present study investigated arsenic removal from water using batch adsorption and fixed-bed column techniques. The material employed in this study was a waste product derived from the treatment of groundwater water for potable purposes, having a substantial iron composition. The material’s properties were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and Fourier-transformed infrared spectroscopy (FT-IR). The point of zero charge (pH(PZC)) was measured, and the pore size and specific surface area were determined using the BET method. Under static conditions, kinetic, thermodynamic, and equilibrium studies were carried out to explore the influencing factors on the adsorption process, namely the pH, contact time, temperature, and initial arsenic concentration in the solution. It was found that the adsorption process is spontaneous, endothermic, and of a physical nature. In the batch adsorption studies, the maximum removal percentage was 80.4% after 90 min, and in a dynamic regime in the fixed-bed column, the efficiency was 99.99% at a sludge:sand = 1:1 ratio for 380 min for a volume of water with arsenic of ~3000 mL. The kinetics of the adsorption process conformed to a pseudo-second-order model. In terms of the equilibrium studies, the Sips model yielded the most accurate representation of the data, revealing a maximum equilibrium capacity of 70.1 mg As(V)/g sludge. For the dynamic regime, the experimental data were fitted using the Bohart–Adams, Thomas, and Clark models, in order to establish the mechanism of the process. Additionally, desorption studies were conducted, serving as an essential step in validating the practical applicability of the adsorption process, specifically in relation to the reutilization of the adsorbent material.
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spelling pubmed-106111272023-10-28 Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study Vancea, Cosmin Mladin, Georgiana Ciopec, Mihaela Negrea, Adina Duteanu, Narcis Negrea, Petru Mosoarca, Giannin Ianasi, Catalin Toxics Article The remediation of arsenic contamination in potable water is an important and urgent concern, necessitating immediate attention. With this objective in mind, the present study investigated arsenic removal from water using batch adsorption and fixed-bed column techniques. The material employed in this study was a waste product derived from the treatment of groundwater water for potable purposes, having a substantial iron composition. The material’s properties were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and Fourier-transformed infrared spectroscopy (FT-IR). The point of zero charge (pH(PZC)) was measured, and the pore size and specific surface area were determined using the BET method. Under static conditions, kinetic, thermodynamic, and equilibrium studies were carried out to explore the influencing factors on the adsorption process, namely the pH, contact time, temperature, and initial arsenic concentration in the solution. It was found that the adsorption process is spontaneous, endothermic, and of a physical nature. In the batch adsorption studies, the maximum removal percentage was 80.4% after 90 min, and in a dynamic regime in the fixed-bed column, the efficiency was 99.99% at a sludge:sand = 1:1 ratio for 380 min for a volume of water with arsenic of ~3000 mL. The kinetics of the adsorption process conformed to a pseudo-second-order model. In terms of the equilibrium studies, the Sips model yielded the most accurate representation of the data, revealing a maximum equilibrium capacity of 70.1 mg As(V)/g sludge. For the dynamic regime, the experimental data were fitted using the Bohart–Adams, Thomas, and Clark models, in order to establish the mechanism of the process. Additionally, desorption studies were conducted, serving as an essential step in validating the practical applicability of the adsorption process, specifically in relation to the reutilization of the adsorbent material. MDPI 2023-10-10 /pmc/articles/PMC10611127/ /pubmed/37888699 http://dx.doi.org/10.3390/toxics11100849 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Vancea, Cosmin
Mladin, Georgiana
Ciopec, Mihaela
Negrea, Adina
Duteanu, Narcis
Negrea, Petru
Mosoarca, Giannin
Ianasi, Catalin
Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study
title Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study
title_full Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study
title_fullStr Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study
title_full_unstemmed Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study
title_short Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study
title_sort arsenic removal using unconventional material with iron content: batch adsorption and column study
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10611127/
https://www.ncbi.nlm.nih.gov/pubmed/37888699
http://dx.doi.org/10.3390/toxics11100849
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