Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals

The remarkable adsorption capacity of graphene-derived materials has prompted their examination in composite materials suitable for deployment in treatment of contaminated waters. In this study, crosslinked calcium alginate–graphene oxide beads were prepared and activated by exposure to pH 4 by usin...

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Autores principales:	Burcu Gunes, Yannick Jaquet, Laura Sánchez, Rebecca Pumarino, Declan McGlade, Brid Quilty, Anne Morrissey, Zahra Gholamvand, Kieran Nolan, Jenny Lawler
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	adsorption graphene oxide methylene blue pharmaceuticals kinetics isotherms and thermodynamics Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/2822d05bd62b4a22bcf4657072b8c101
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spelling	oai:doaj.org-article:2822d05bd62b4a22bcf4657072b8c1012021-11-11T17:54:47ZActivated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals10.3390/ma142163431996-1944https://doaj.org/article/2822d05bd62b4a22bcf4657072b8c1012021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6343https://doaj.org/toc/1996-1944The remarkable adsorption capacity of graphene-derived materials has prompted their examination in composite materials suitable for deployment in treatment of contaminated waters. In this study, crosslinked calcium alginate–graphene oxide beads were prepared and activated by exposure to pH 4 by using 0.1M HCl. The activated beads were investigated as novel adsorbents for the removal of organic pollutants (methylene blue dye and the pharmaceuticals famotidine and diclofenac) with a range of physicochemical properties. The effects of initial pollutant concentration, temperature, pH, and adsorbent dose were investigated, and kinetic models were examined for fit to the data. The maximum adsorption capacities q<sub>max</sub> obtained were 1334, 35.50 and 36.35 mg g<sup>−1</sup> for the uptake of methylene blue, famotidine and diclofenac, respectively. The equilibrium adsorption had an alignment with Langmuir isotherms, while the kinetics were most accurately modelled using pseudo- first-order and second order models according to the regression analysis. Thermodynamic parameters such as ΔG°, ΔH° and ΔS° were calculated and the adsorption process was determined to be exothermic and spontaneous.Burcu GunesYannick JaquetLaura SánchezRebecca PumarinoDeclan McGladeBrid QuiltyAnne MorrisseyZahra GholamvandKieran NolanJenny LawlerMDPI AGarticleadsorptiongraphene oxidemethylene bluepharmaceuticalskineticsisotherms and thermodynamicsTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6343, p 6343 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption graphene oxide methylene blue pharmaceuticals kinetics isotherms and thermodynamics Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	adsorption graphene oxide methylene blue pharmaceuticals kinetics isotherms and thermodynamics Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Burcu Gunes Yannick Jaquet Laura Sánchez Rebecca Pumarino Declan McGlade Brid Quilty Anne Morrissey Zahra Gholamvand Kieran Nolan Jenny Lawler Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals
description	The remarkable adsorption capacity of graphene-derived materials has prompted their examination in composite materials suitable for deployment in treatment of contaminated waters. In this study, crosslinked calcium alginate–graphene oxide beads were prepared and activated by exposure to pH 4 by using 0.1M HCl. The activated beads were investigated as novel adsorbents for the removal of organic pollutants (methylene blue dye and the pharmaceuticals famotidine and diclofenac) with a range of physicochemical properties. The effects of initial pollutant concentration, temperature, pH, and adsorbent dose were investigated, and kinetic models were examined for fit to the data. The maximum adsorption capacities q<sub>max</sub> obtained were 1334, 35.50 and 36.35 mg g<sup>−1</sup> for the uptake of methylene blue, famotidine and diclofenac, respectively. The equilibrium adsorption had an alignment with Langmuir isotherms, while the kinetics were most accurately modelled using pseudo- first-order and second order models according to the regression analysis. Thermodynamic parameters such as ΔG°, ΔH° and ΔS° were calculated and the adsorption process was determined to be exothermic and spontaneous.
format	article
author	Burcu Gunes Yannick Jaquet Laura Sánchez Rebecca Pumarino Declan McGlade Brid Quilty Anne Morrissey Zahra Gholamvand Kieran Nolan Jenny Lawler
author_facet	Burcu Gunes Yannick Jaquet Laura Sánchez Rebecca Pumarino Declan McGlade Brid Quilty Anne Morrissey Zahra Gholamvand Kieran Nolan Jenny Lawler
author_sort	Burcu Gunes
title	Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals
title_short	Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals
title_full	Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals
title_fullStr	Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals
title_full_unstemmed	Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals
title_sort	activated graphene oxide-calcium alginate beads for adsorption of methylene blue and pharmaceuticals
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2822d05bd62b4a22bcf4657072b8c101
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_version_	1718431991925309440

Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals

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