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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...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585342/ https://www.ncbi.nlm.nih.gov/pubmed/34771868 http://dx.doi.org/10.3390/ma14216343 |
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author | Gunes, Burcu Jaquet, Yannick Sánchez, Laura Pumarino, Rebecca McGlade, Declan Quilty, Brid Morrissey, Anne Gholamvand, Zahra Nolan, Kieran Lawler, Jenny |
author_facet | Gunes, Burcu Jaquet, Yannick Sánchez, Laura Pumarino, Rebecca McGlade, Declan Quilty, Brid Morrissey, Anne Gholamvand, Zahra Nolan, Kieran Lawler, Jenny |
author_sort | Gunes, Burcu |
collection | PubMed |
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(max) obtained were 1334, 35.50 and 36.35 mg g(−1) 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 | Online Article Text |
id | pubmed-8585342 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-85853422021-11-12 Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals Gunes, Burcu Jaquet, Yannick Sánchez, Laura Pumarino, Rebecca McGlade, Declan Quilty, Brid Morrissey, Anne Gholamvand, Zahra Nolan, Kieran Lawler, Jenny Materials (Basel) Article 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(max) obtained were 1334, 35.50 and 36.35 mg g(−1) 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. MDPI 2021-10-23 /pmc/articles/PMC8585342/ /pubmed/34771868 http://dx.doi.org/10.3390/ma14216343 Text en © 2021 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 Gunes, Burcu Jaquet, Yannick Sánchez, Laura Pumarino, Rebecca McGlade, Declan Quilty, Brid Morrissey, Anne Gholamvand, Zahra Nolan, Kieran Lawler, Jenny Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals |
title | 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_short | 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 |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585342/ https://www.ncbi.nlm.nih.gov/pubmed/34771868 http://dx.doi.org/10.3390/ma14216343 |
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