NDLI: Removal of methylene blue using MnO<sub>2</sub>@rGO nanocomposite from textile wastewater: Isotherms, kinetics and thermodynamics studies.

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Removal of methylene blue using MnO₂@rGO nanocomposite from textile wastewater: Isotherms, kinetics and thermodynamics studies.

Content Provider	Europe PMC
Author	Munonde, Tshimangadzo S. Nqombolo, Azile Hobongwana, Siphosethu Mpupa, Anele Nomngongo, Philiswa Nosizo
Copyright Year	2023
Abstract	In this study, the adsorptive removal of methylene blue dye, which is commonly used in textile industries, was investigated using the MnO2@reduced graphene oxide (rGO) adsorbent. The sonication-assisted synthesis from rGO nanosheets and MnO2 nanoparticles resulted to the MnO2@rGO nanocomposite with improved physicochemical properties. The characterization results showed the improved surface area, porous structure and adsorption sites from the nitrogen adsorption-desorption studies, improved morphology from the Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) and the improved crystal structure from X-ray powder diffraction (XRD). The improved physicochemical properties on the MnO2@rGO nanocomposite played a significant role in enhancing the dye removal in textile wastewater. The equilibrium experimental data was best described by the Langmuir isotherm model with a maximum adsorption capacity of 156 mg g−1, suggesting a monolayer adsorption. The kinetic data best fitted the pseudo-second order kinetic model, suggesting a chemisorption adsorption process. The thermodynamic data (ΔG°, ΔH° and ΔS°) confirmed the feasibility, randomness and spontaneous nature of the adsorption process. The mechanism of adsorption involved the hydrogen bonding, π-π interactions and electrostatic interactions. The removal of methylene blue using MnO2@rGO nanocomposite in spiked textile wastewater yielded a 98–99% removal. The method demonstrated competitiveness when compared with literature reported results, paving way for further investigations towards industrial scale applications.
Journal	Heliyon
Volume Number	9
PubMed Central reference number	PMC10161714
Issue Number	4
PubMed reference number	37151643
e-ISSN	24058440
DOI	10.1016/j.heliyon.2023.e15502
Language	English
Publisher	Elsevier
Publisher Date	2023-04-17
Access Restriction	Open
Rights License	This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). © 2023 The Authors
Subject Keyword	Chemisorption Isotherms Kinetics Methylene blue MnO2@rGO nanocomposite Textile wastewater
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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Removal of methylene blue using MnO2@rGO nanocomposite from textile wastewater: Isotherms, kinetics and thermodynamics studies.

Removal of methylene blue using MnO₂@rGO nanocomposite from textile wastewater: Isotherms, kinetics and thermodynamics studies.