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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Main Authors:	Abdulaziz Ali Alghamdi, Abdel-Basit Al-Odayni, Waseem Sharaf Saeed, Mohammed S. Almutairi, Fahad A. Alharthi, Taieb Aouak, Abdullah Al-Kahtani
Format:	Article
Language:	English
Published:	MDPI AG 2019-10-01
Series:	Molecules
Subjects:	polypyrrole-based activated carbon alkali activation adsorption methyl orange water pollution dye removal
Online Access:	https://www.mdpi.com/1420-3049/24/20/3685

id	doaj-19c4cf52d3954bfda2e5aa5f345b1629
record_format	Article
spelling	doaj-19c4cf52d3954bfda2e5aa5f345b16292020-11-25T00:39:59ZengMDPI AGMolecules1420-30492019-10-012420368510.3390/molecules24203685molecules24203685Adsorption of Azo Dye Methyl Orange from Aqueous Solutions Using Alkali-Activated Polypyrrole-Based Graphene OxideAbdulaziz Ali Alghamdi0Abdel-Basit Al-Odayni1Waseem Sharaf Saeed2Mohammed S. Almutairi3Fahad A. Alharthi4Taieb Aouak5Abdullah Al-Kahtani6Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi ArabiaChemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi ArabiaChemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi ArabiaChemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi ArabiaChemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi ArabiaChemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi ArabiaChemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi ArabiaThe 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 (<i>R</i><sup>2</sup> = 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.https://www.mdpi.com/1420-3049/24/20/3685polypyrrole-based activated carbonalkali activationadsorptionmethyl orangewater pollutiondye removal
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Abdulaziz Ali Alghamdi Abdel-Basit Al-Odayni Waseem Sharaf Saeed Mohammed S. Almutairi Fahad A. Alharthi Taieb Aouak Abdullah Al-Kahtani
spellingShingle	Abdulaziz Ali Alghamdi Abdel-Basit Al-Odayni Waseem Sharaf Saeed Mohammed S. Almutairi Fahad A. Alharthi Taieb Aouak Abdullah Al-Kahtani Adsorption of Azo Dye Methyl Orange from Aqueous Solutions Using Alkali-Activated Polypyrrole-Based Graphene Oxide Molecules polypyrrole-based activated carbon alkali activation adsorption methyl orange water pollution dye removal
author_facet	Abdulaziz Ali Alghamdi Abdel-Basit Al-Odayni Waseem Sharaf Saeed Mohammed S. Almutairi Fahad A. Alharthi Taieb Aouak Abdullah Al-Kahtani
author_sort	Abdulaziz Ali Alghamdi
title	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_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_sort	adsorption of azo dye methyl orange from aqueous solutions using alkali-activated polypyrrole-based graphene oxide
publisher	MDPI AG
series	Molecules
issn	1420-3049
publishDate	2019-10-01
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 (<i>R</i><sup>2</sup> = 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.
topic	polypyrrole-based activated carbon alkali activation adsorption methyl orange water pollution dye removal
url	https://www.mdpi.com/1420-3049/24/20/3685
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Adsorption of Azo Dye Methyl Orange from Aqueous Solutions Using Alkali-Activated Polypyrrole-Based Graphene Oxide

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