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Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water

Organic waste materials and semi-products containing cellulose are used as low-cost adsorbents that are able to compete with conventional sorbents. In addition, their capacity to bind heavy metal ions can be intensified by chemical treatments using mineral and organic acids, bases, oxidizing agents,...

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Autores principales: Kovacova, Zdenka, Demcak, Stefan, Balintova, Magdalena, Pla, Cocencepcion, Zinicovscaia, Inga
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7476008/
https://www.ncbi.nlm.nih.gov/pubmed/32823585
http://dx.doi.org/10.3390/ma13163575
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author Kovacova, Zdenka
Demcak, Stefan
Balintova, Magdalena
Pla, Cocencepcion
Zinicovscaia, Inga
author_facet Kovacova, Zdenka
Demcak, Stefan
Balintova, Magdalena
Pla, Cocencepcion
Zinicovscaia, Inga
author_sort Kovacova, Zdenka
collection PubMed
description Organic waste materials and semi-products containing cellulose are used as low-cost adsorbents that are able to compete with conventional sorbents. In addition, their capacity to bind heavy metal ions can be intensified by chemical treatments using mineral and organic acids, bases, oxidizing agents, and organic compounds. In this paper, we studied the biosorption capacity of natural and modified wooden sawdust of poplar, cherry, spruce, and hornbeam in order to remove heavy metals from acidic model solutions. The Fourier transform infrared spectroscopy (FTIR) spectra showed changes of the functional groups due to the alkaline modification of sawdust, which manifested in the considerably increased intensity of the hydroxyl peaks. The adsorption isotherm models clearly indicated that the adsorptive behavior of metal ions in treated sawdust satisfied not only the Langmuir model, but also the Freundlich model. The adsorption data obtained for studied sorbents were better fitted by the Langmuir isotherm model for both metals, except for spruce sawdust. Surface complexation and ion exchange are the major mechanisms involved in metal ion removal. We investigated the efficiency of the alkaline modified sawdust for metal removal under various initial concentrations of Cu(II) and Zn(II) from model solutions. The highest adsorption efficiency values (copper 94.3% at pH 6.8 and zinc 98.2% at pH 7.3) were obtained for poplar modified by KOH. For all types of sawdust, we found that the sorption efficiency of modified sorbents was higher in comparison to untreated sawdust. The value of the pH initially increased more in the case of modified sawdust (8.2 for zinc removal with spruce NaOH) and then slowly decreased (7.0 for Zn(II) with spruce NaOH).
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spelling pubmed-74760082020-09-09 Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water Kovacova, Zdenka Demcak, Stefan Balintova, Magdalena Pla, Cocencepcion Zinicovscaia, Inga Materials (Basel) Article Organic waste materials and semi-products containing cellulose are used as low-cost adsorbents that are able to compete with conventional sorbents. In addition, their capacity to bind heavy metal ions can be intensified by chemical treatments using mineral and organic acids, bases, oxidizing agents, and organic compounds. In this paper, we studied the biosorption capacity of natural and modified wooden sawdust of poplar, cherry, spruce, and hornbeam in order to remove heavy metals from acidic model solutions. The Fourier transform infrared spectroscopy (FTIR) spectra showed changes of the functional groups due to the alkaline modification of sawdust, which manifested in the considerably increased intensity of the hydroxyl peaks. The adsorption isotherm models clearly indicated that the adsorptive behavior of metal ions in treated sawdust satisfied not only the Langmuir model, but also the Freundlich model. The adsorption data obtained for studied sorbents were better fitted by the Langmuir isotherm model for both metals, except for spruce sawdust. Surface complexation and ion exchange are the major mechanisms involved in metal ion removal. We investigated the efficiency of the alkaline modified sawdust for metal removal under various initial concentrations of Cu(II) and Zn(II) from model solutions. The highest adsorption efficiency values (copper 94.3% at pH 6.8 and zinc 98.2% at pH 7.3) were obtained for poplar modified by KOH. For all types of sawdust, we found that the sorption efficiency of modified sorbents was higher in comparison to untreated sawdust. The value of the pH initially increased more in the case of modified sawdust (8.2 for zinc removal with spruce NaOH) and then slowly decreased (7.0 for Zn(II) with spruce NaOH). MDPI 2020-08-13 /pmc/articles/PMC7476008/ /pubmed/32823585 http://dx.doi.org/10.3390/ma13163575 Text en © 2020 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Kovacova, Zdenka
Demcak, Stefan
Balintova, Magdalena
Pla, Cocencepcion
Zinicovscaia, Inga
Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water
title Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water
title_full Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water
title_fullStr Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water
title_full_unstemmed Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water
title_short Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water
title_sort influence of wooden sawdust treatments on cu(ii) and zn(ii) removal from water
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7476008/
https://www.ncbi.nlm.nih.gov/pubmed/32823585
http://dx.doi.org/10.3390/ma13163575
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