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Pb(II) removal using carbon adsorbents prepared by hybrid heating system: Understanding the microwave heating by dielectric characterization and numerical simulation

Durán-Jiménez, Gabriela; Hernández-Montoya, Virginia; Oyarzun, Jose Rodríguez; Montes-Morán, Miguel Ángel; Binner, Eleanor

Pb(II) removal using carbon adsorbents prepared by hybrid heating system: Understanding the microwave heating by dielectric characterization and numerical simulation Thumbnail


Authors

Virginia Hernández-Montoya

Miguel Ángel Montes-Morán



Abstract

This work studies the effect of microwaves in the synthesis of carbon adsorbents using pecan nutshell biomass as a precursor in a hybrid multimode microwave cavity avoiding the utilization of chemical activation or susceptors. The dielectric properties were calculated using the cavity perturbation method, and the power distribution of the electromagnetic field inside cavity was obtained by COMSOL Multiphysics. S-350-MW was obtained using at 350 °C and 200 W and it was characterized using elemental analysis, potentiometric titration, FT-IR and nitrogen adsorption isotherms at −196 °C. The adsorption of Pb(II), in single and binary solutions with Cu(II), Cd(II) and Zn(II) in batch systems indicate that the removal of Pb(II) is affected in the presence of Cu(II) due to the competition of these ions as a result of their similarities such as Pauling electronegativity. Finally, the removal of Pb(II) in continuous systems using packed bed columns showed the pH has the most significant effect according to the variance analysis. The finding highlighted the importance of the acidic functional groups in the performance of carbonaceous adsorbents for the removal of Pb(II). Results of this study contribute to the understandings and application of a hybrid heating system and establish the basis of the role of heating processes in the preparation of carbonaceous adsorbents using microwaves. The Pb(II) removal efficiency achieved in this study is significantly higher than the values reported for carbons prepared by using microwave heating which employs susceptors and/or chemical agents reported in literature, demonstrating that it is possible to obtain effective carbon absorbents for the removal of Pb(II) without the use of any additional susceptors or chemical activation.

Citation

Durán-Jiménez, G., Hernández-Montoya, V., Oyarzun, J. R., Montes-Morán, M. Á., & Binner, E. (2019). Pb(II) removal using carbon adsorbents prepared by hybrid heating system: Understanding the microwave heating by dielectric characterization and numerical simulation. Journal of Molecular Liquids, 277, 663-671. https://doi.org/10.1016/j.molliq.2018.12.143

Journal Article Type Article
Acceptance Date Dec 28, 2018
Online Publication Date Dec 29, 2018
Publication Date Mar 1, 2019
Deposit Date Jan 4, 2019
Publicly Available Date Mar 28, 2024
Journal Journal of Molecular Liquids
Print ISSN 0167-7322
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 277
Pages 663-671
DOI https://doi.org/10.1016/j.molliq.2018.12.143
Keywords Physical and Theoretical Chemistry; Spectroscopy; Materials Chemistry; Atomic and Molecular Physics, and Optics; Electronic, Optical and Magnetic Materials; Condensed Matter Physics
Public URL https://nottingham-repository.worktribe.com/output/1444487
Publisher URL https://www.sciencedirect.com/science/article/pii/S0167732218353595

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