| Title: | Adsorption of pollutants from colored wastewaters after natural wool dyeing |
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| Authors: | ID Ojstršek, Alenka (Author)
ID Vouk, Primož (Author)
ID Fakin, Darinka (Author) |
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| Files: |  materials-15-01488-v2.pdf (27,10 MB)
MD5: E28D91E26F4B1DA2F7763D7DED7BA4FE
 https://www.mdpi.com/1996-1944/15/4/1488
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| Language: | English |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FS - Faculty of Mechanical Engineering
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| Abstract: | 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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| Keywords: | wool dyeing, natural dyes, wastewater treatment, decoloration, heavy metals’ reduction, adsorption |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 10.01.2022 |
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| Article acceptance date: | 15.02.2022 |
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| Publication date: | 16.02.2022 |
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| Publisher: | MDPI AG |
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| Year of publishing: | 2022 |
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| Number of pages: | 14 str. |
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| Numbering: | Vol. 15, iss. 4 (1488) |
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| PID: | 20.500.12556/DKUM-92197  |
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| UDC: | 677.017:502/504 |
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| ISSN on article: | 1996-1944 |
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| COBISS.SI-ID: | 97969155 |
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| DOI: | 10.3390/ma15041488 |
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| Copyright: | © 2022 by the authors. |
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| Publication date in DKUM: | 20.03.2025 |
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| Views: | 173 |
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| Downloads: | 11 |
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| Metadata: |    |
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| Categories: | Misc.
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