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Open AccessArticle

The Adsorption of Methylene Blue on Eco-Friendly Reduced Graphene Oxide

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Grupo de Investigación de Materiales Avanzados, Facultad de Ciencias, Escuela Superior Politécnica de Chimborazo, Riobamba EC-060155, Ecuador
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Faculty of Mechanical Engineering, Escuela Superior Politécnica de Chimborazo, Riobamba EC-060155, Ecuador
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Grupo de Fisicoquímica de Materiales, Universidad Técnica Particular de Loja, Loja EC-110160, Ecuador
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GraphenTech NL, Olympiaweg 28A, 3077AL Rotterdam, The Netherlands
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School of Chemical Sciences and Engineering, Yachay Tech University, Urcuquí EC-100119, Ecuador
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CompNano, School of Physical Sciences and Nanotechnology, Yachay Tech University, Urcuquí EC-100119, Ecuador
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UNICARIBE Research Center, University of Calabria, I-87036 Rende (CS), Italy
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Instituto Tecnológico de Santo Domingo, Área de Ciencias Básicas y Ambientales, Av. Los Próceres, Santo Domingo 10602, Dominican Republic
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Surface Nanoscience Group, Department of Physics, University of Calabria, Via P. Bucci, Cubo 33C, I-87036 Rende, Italy
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Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(4), 681; https://doi.org/10.3390/nano10040681
Received: 6 March 2020 / Revised: 25 March 2020 / Accepted: 30 March 2020 / Published: 4 April 2020
(This article belongs to the Section Synthesis, Interfaces and Nanostructures)
Recently, green-prepared oxidized graphenes have attracted huge interest in water purification and wastewater treatment. Herein, reduced graphene oxide (rGO) was prepared by a scalable and eco-friendly method, and its potential use for the removal of methylene blue (MB) from water systems, was explored. The present work includes the green protocol to produce rGO and respective spectroscopical and morphological characterizations, as well as several kinetics, isotherms, and thermodynamic analyses to successfully demonstrate the adsorption of MB. The pseudo-second-order model was appropriated to describe the adsorption kinetics of MB onto rGO, suggesting an equilibrium time of 30 min. Otherwise, the Langmuir model was more suitable to describe the adsorption isotherms, indicating a maximum adsorption capacity of 121.95 mg g−1 at 298 K. In addition, kinetics and thermodynamic analyses demonstrated that the adsorption of MB onto rGO can be treated as a mixed physisorption–chemisorption process described by H-bonding, electrostatic, and π π interactions. These results show the potential of green-prepared rGO to remove cationic dyes from wastewater systems. View Full-Text
Keywords: reduced graphene oxide; citric acid; methylene blue; adsorption reduced graphene oxide; citric acid; methylene blue; adsorption
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MDPI and ACS Style

Arias Arias, F.; Guevara, M.; Tene, T.; Angamarca, P.; Molina, R.; Valarezo, A.; Salguero, O.; Vacacela Gomez, C.; Arias, M.; Caputi, L.S. The Adsorption of Methylene Blue on Eco-Friendly Reduced Graphene Oxide. Nanomaterials 2020, 10, 681.

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