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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...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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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. |
format | Online Article Text |
id | pubmed-8880600 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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