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Adsorption of Azo Dye Methyl Orange from Aqueous Solutions Using Alkali-Activated Polypyrrole-Based Graphene Oxide

The adsorption of methyl orange (MO) from aqueous solutions onto a KOH-activated polypyrrole-based adsorbent (PACK) was investigated using batch and fixed-bed column techniques. The structural, thermal, and morphological properties of the PACK, analyzed by various methods, support its applicability...

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Autores principales: Alghamdi, Abdulaziz Ali, Al-Odayni, Abdel-Basit, Saeed, Waseem Sharaf, Almutairi, Mohammed S., Alharthi, Fahad A., Aouak, Taieb, Al-Kahtani, Abdullah
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6833077/
https://www.ncbi.nlm.nih.gov/pubmed/31614943
http://dx.doi.org/10.3390/molecules24203685
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author Alghamdi, Abdulaziz Ali
Al-Odayni, Abdel-Basit
Saeed, Waseem Sharaf
Almutairi, Mohammed S.
Alharthi, Fahad A.
Aouak, Taieb
Al-Kahtani, Abdullah
author_facet Alghamdi, Abdulaziz Ali
Al-Odayni, Abdel-Basit
Saeed, Waseem Sharaf
Almutairi, Mohammed S.
Alharthi, Fahad A.
Aouak, Taieb
Al-Kahtani, Abdullah
author_sort Alghamdi, Abdulaziz Ali
collection PubMed
description The adsorption of methyl orange (MO) from aqueous solutions onto a KOH-activated polypyrrole-based adsorbent (PACK) was investigated using batch and fixed-bed column techniques. The structural, thermal, and morphological properties of the PACK, analyzed by various methods, support its applicability as an adsorbent. An adsorption kinetic study revealed a preferably pseudo-second-order (R(2) = 0.9996) and rate-limiting step controlled by both film and intra-particle diffusions. The thermodynamic adsorption tests resulted in negative ΔG°, ΔH°, and ΔS° values, which decreased as the temperature and concentration increased, indicating the spontaneous and exothermic adsorption over 25–45 °C. The adsorption isotherms fit the experimental data in the order of Langmuir ≈ Freundlich > Temkin, with evidence of adsorption operating well via the monolayer physical adsorption process, and maximum monolayer adsorption ranging from 520.8 to 497.5 mg/g. The breakthrough curve of the fixed-bed column experiment was modeled using the Thomas, Yoon–Nelson, and Hill models, resulting in an equilibrium capacity of 57.21 mg/g. A 73% MO recovery was achieved, indicating the possibility of column regeneration. Compared to other adsorbents reported, PACK had comparable or even superior capacity toward MO. For cost-effectiveness, similar nitrogen-containing polymeric wastes could be exploited to obtain such excellent materials for various applications.
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spelling pubmed-68330772019-11-25 Adsorption of Azo Dye Methyl Orange from Aqueous Solutions Using Alkali-Activated Polypyrrole-Based Graphene Oxide Alghamdi, Abdulaziz Ali Al-Odayni, Abdel-Basit Saeed, Waseem Sharaf Almutairi, Mohammed S. Alharthi, Fahad A. Aouak, Taieb Al-Kahtani, Abdullah Molecules Article The adsorption of methyl orange (MO) from aqueous solutions onto a KOH-activated polypyrrole-based adsorbent (PACK) was investigated using batch and fixed-bed column techniques. The structural, thermal, and morphological properties of the PACK, analyzed by various methods, support its applicability as an adsorbent. An adsorption kinetic study revealed a preferably pseudo-second-order (R(2) = 0.9996) and rate-limiting step controlled by both film and intra-particle diffusions. The thermodynamic adsorption tests resulted in negative ΔG°, ΔH°, and ΔS° values, which decreased as the temperature and concentration increased, indicating the spontaneous and exothermic adsorption over 25–45 °C. The adsorption isotherms fit the experimental data in the order of Langmuir ≈ Freundlich > Temkin, with evidence of adsorption operating well via the monolayer physical adsorption process, and maximum monolayer adsorption ranging from 520.8 to 497.5 mg/g. The breakthrough curve of the fixed-bed column experiment was modeled using the Thomas, Yoon–Nelson, and Hill models, resulting in an equilibrium capacity of 57.21 mg/g. A 73% MO recovery was achieved, indicating the possibility of column regeneration. Compared to other adsorbents reported, PACK had comparable or even superior capacity toward MO. For cost-effectiveness, similar nitrogen-containing polymeric wastes could be exploited to obtain such excellent materials for various applications. MDPI 2019-10-13 /pmc/articles/PMC6833077/ /pubmed/31614943 http://dx.doi.org/10.3390/molecules24203685 Text en © 2019 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
Alghamdi, Abdulaziz Ali
Al-Odayni, Abdel-Basit
Saeed, Waseem Sharaf
Almutairi, Mohammed S.
Alharthi, Fahad A.
Aouak, Taieb
Al-Kahtani, Abdullah
Adsorption of Azo Dye Methyl Orange from Aqueous Solutions Using Alkali-Activated Polypyrrole-Based Graphene Oxide
title Adsorption of Azo Dye Methyl Orange from Aqueous Solutions Using Alkali-Activated Polypyrrole-Based Graphene Oxide
title_full Adsorption of Azo Dye Methyl Orange from Aqueous Solutions Using Alkali-Activated Polypyrrole-Based Graphene Oxide
title_fullStr Adsorption of Azo Dye Methyl Orange from Aqueous Solutions Using Alkali-Activated Polypyrrole-Based Graphene Oxide
title_full_unstemmed Adsorption of Azo Dye Methyl Orange from Aqueous Solutions Using Alkali-Activated Polypyrrole-Based Graphene Oxide
title_short Adsorption of Azo Dye Methyl Orange from Aqueous Solutions Using Alkali-Activated Polypyrrole-Based Graphene Oxide
title_sort adsorption of azo dye methyl orange from aqueous solutions using alkali-activated polypyrrole-based graphene oxide
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6833077/
https://www.ncbi.nlm.nih.gov/pubmed/31614943
http://dx.doi.org/10.3390/molecules24203685
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