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Article

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

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DCU Water Institute, School of Biotechnology, Dublin City University, Glasnevin, D09 NA55 Dublin, Ireland
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Institut Technologie du vivant, University of Applied Sciences and Arts Western Switzerland, Rte de Moutier 14, 2800 Delémont, Switzerland
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Faculty of Biology, University of Oviedo Calle Catedrático Valentín Andrés Álvarez, 33006 Oviedo, Spain
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DCU Water Institute, School of Mechanical and Manufacturing Engineering, Dublin City University, Glasnevin, D09 NA55 Dublin, Ireland
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DCU Water Institute, School of Chemical Sciences, Dublin City University, Glasnevin, D09 NA55 Dublin, Ireland
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Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University, Doha 34110, Qatar
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Author to whom correspondence should be addressed.
Academic Editor: Avelino Núñez-Delgado
Materials 2021, 14(21), 6343; https://doi.org/10.3390/ma14216343
Received: 16 September 2021 / Revised: 15 October 2021 / Accepted: 18 October 2021 / Published: 23 October 2021
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 qmax 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. View Full-Text
Keywords: adsorption; graphene oxide; methylene blue; pharmaceuticals; kinetics; isotherms and thermodynamics adsorption; graphene oxide; methylene blue; pharmaceuticals; kinetics; isotherms and thermodynamics
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MDPI and ACS Style

Gunes, B.; Jaquet, Y.; Sánchez, L.; Pumarino, R.; McGlade, D.; Quilty, B.; Morrissey, A.; Gholamvand, Z.; Nolan, K.; Lawler, J. Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals. Materials 2021, 14, 6343. https://doi.org/10.3390/ma14216343

AMA Style

Gunes B, Jaquet Y, Sánchez L, Pumarino R, McGlade D, Quilty B, Morrissey A, Gholamvand Z, Nolan K, Lawler J. Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals. Materials. 2021; 14(21):6343. https://doi.org/10.3390/ma14216343

Chicago/Turabian Style

Gunes, Burcu, Yannick Jaquet, Laura Sánchez, Rebecca Pumarino, Declan McGlade, Brid Quilty, Anne Morrissey, Zahra Gholamvand, Kieran Nolan, and Jenny Lawler. 2021. "Activated Graphene Oxide-Calcium Alginate Beads for Adsorption of Methylene Blue and Pharmaceuticals" Materials 14, no. 21: 6343. https://doi.org/10.3390/ma14216343

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