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Adsorption of Pollutants from Colored Wastewaters after Natural Wool Dyeing

The presented study assesses the efficiency of selected adsorbents, zeolite 4A in two particle sizes and pelletized activated carbon (AC), for the potential removal of color, chemical oxygen demand (COD), total organic carbon (TOC) and metals from wastewaters after natural wool dyeing. Firstly, the...

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Autores principales: Ojstršek, Alenka, Vouk, Primož, Fakin, Darinka
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8880600/
https://www.ncbi.nlm.nih.gov/pubmed/35208028
http://dx.doi.org/10.3390/ma15041488
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author Ojstršek, Alenka
Vouk, Primož
Fakin, Darinka
author_facet Ojstršek, Alenka
Vouk, Primož
Fakin, Darinka
author_sort Ojstršek, Alenka
collection PubMed
description The presented study assesses the efficiency of selected adsorbents, zeolite 4A in two particle sizes and pelletized activated carbon (AC), for the potential removal of color, chemical oxygen demand (COD), total organic carbon (TOC) and metals from wastewaters after natural wool dyeing. Firstly, the natural coloring compounds were extracted from dried common walnut (Juglans regia) leaves and used further for exhaustion dyeing of wool fibers, together with three different metallic salts in two concentrations (meta-mordanting). Effluents with higher mordant concentration were additionally treated according to a shake-flask adsorption experiment. The obtained results revealed efficient removal of exceeded metallic ions by zeolite (up to 94.7%), on account of their superior ion exchange capability as compared to AC. The zeolites also reduced turbidity and electrical conductivity significantly. On the other hand, AC was more efficient for the reduction in organic pollution, COD up to 96% and TOC up to 95%, due to its higher specific surface area and total pore volume, and, thus, higher potential for adsorption of different compounds in comparison to 4A. All three proposed adsorbents lowered wastewaters’ coloration remarkably, up to 78% (AC) and up to 71% (4A), depending on the type of effluent/mordant and inspected wavelength; although, the spectral absorbance coefficient (SAC) values remained highly above the limit values for discharge of wastewaters into watercourses.
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spelling pubmed-88806002022-02-26 Adsorption of Pollutants from Colored Wastewaters after Natural Wool Dyeing Ojstršek, Alenka Vouk, Primož Fakin, Darinka Materials (Basel) Article The presented study assesses the efficiency of selected adsorbents, zeolite 4A in two particle sizes and pelletized activated carbon (AC), for the potential removal of color, chemical oxygen demand (COD), total organic carbon (TOC) and metals from wastewaters after natural wool dyeing. Firstly, the natural coloring compounds were extracted from dried common walnut (Juglans regia) leaves and used further for exhaustion dyeing of wool fibers, together with three different metallic salts in two concentrations (meta-mordanting). Effluents with higher mordant concentration were additionally treated according to a shake-flask adsorption experiment. The obtained results revealed efficient removal of exceeded metallic ions by zeolite (up to 94.7%), on account of their superior ion exchange capability as compared to AC. The zeolites also reduced turbidity and electrical conductivity significantly. On the other hand, AC was more efficient for the reduction in organic pollution, COD up to 96% and TOC up to 95%, due to its higher specific surface area and total pore volume, and, thus, higher potential for adsorption of different compounds in comparison to 4A. All three proposed adsorbents lowered wastewaters’ coloration remarkably, up to 78% (AC) and up to 71% (4A), depending on the type of effluent/mordant and inspected wavelength; although, the spectral absorbance coefficient (SAC) values remained highly above the limit values for discharge of wastewaters into watercourses. MDPI 2022-02-16 /pmc/articles/PMC8880600/ /pubmed/35208028 http://dx.doi.org/10.3390/ma15041488 Text en © 2022 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
Ojstršek, Alenka
Vouk, Primož
Fakin, Darinka
Adsorption of Pollutants from Colored Wastewaters after Natural Wool Dyeing
title Adsorption of Pollutants from Colored Wastewaters after Natural Wool Dyeing
title_full Adsorption of Pollutants from Colored Wastewaters after Natural Wool Dyeing
title_fullStr Adsorption of Pollutants from Colored Wastewaters after Natural Wool Dyeing
title_full_unstemmed Adsorption of Pollutants from Colored Wastewaters after Natural Wool Dyeing
title_short Adsorption of Pollutants from Colored Wastewaters after Natural Wool Dyeing
title_sort adsorption of pollutants from colored wastewaters after natural wool dyeing
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8880600/
https://www.ncbi.nlm.nih.gov/pubmed/35208028
http://dx.doi.org/10.3390/ma15041488
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