Microwave pyrolysis of pecan nut shell and thermogravimetric, textural and spectroscopic characterization of carbonaceous products

Durán-Jiménez, G.; Hernández-Montoya, V.; Montes-Morán, M.A.; Kingman, S.W.; Monti, T.; Binner, E.R.

Abstract

In the present work, the pyrolysis of pecan nut shell was studied using microwave technology at different input power and exposure time. The carbonaceous products were characterized using elemental analysis, potentiometric titration, thermogravimetric analysis, N2 adsorption isotherms at −196 °C and FT-IR spectroscopy. The characteristics of microwave carbonaceous products were compared with carbons prepared by conventional heating and commercial carbons and finally, the interaction of textile dyes with the carbonaceous materials was studied. The results are indicating that it is possible to obtain carbonaceous materials with similar textural parameters in conventional and microwave systems, but for microwave heating the processing times are short (3 min). Also, the exposure time of 2 min of microwave are not enough for the complete depolymerization of the lignocellulosic matrix of the pecan nut shell and significant amount of cellulose and hemicelluloses remain in char after microwave treatment. Finally, all the carbons obtained by microwave heating are microporous materials with a high number of basic groups on their surface and the high molecular size of dyes is controlling the adsorption on these materials.

Citation

Durán-Jiménez, G., Hernández-Montoya, V., Montes-Morán, M., Kingman, S., Monti, T., & Binner, E. (2018). Microwave pyrolysis of pecan nut shell and thermogravimetric, textural and spectroscopic characterization of carbonaceous products. Journal of Analytical and Applied Pyrolysis, 135, 160-168. https://doi.org/10.1016/j.jaap.2018.09.007

• Journal Article Type: Article
• Acceptance Date: Sep 6, 2018
• Online Publication Date: Sep 7, 2018
• Publication Date: Oct 31, 2018
• Deposit Date: Oct 18, 2018
• Publicly Available Date: Sep 8, 2019
• Journal: Journal of Analytical and Applied Pyrolysis
• Print ISSN: 0165-2370
• Electronic ISSN: 1873-250X
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 135
• Pages: 160-168
• DOI: https://doi.org/10.1016/j.jaap.2018.09.007
• Keywords: Carbons; Microwave technology; Pyrolysis; Textile dyes
• Public URL: https://nottingham-repository.worktribe.com/output/1174714
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0165237018302857?via%3Dihub
• Additional Information: This article is maintained by: Elsevier; Article Title: Microwave pyrolysis of pecan nut shell and thermogravimetric, textural and spectroscopic characterization of carbonaceous products; Journal Title: Journal of Analytical and Applied Pyrolysis; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.jaap.2018.09.007; Content Type: article; Copyright: © 2018 Elsevier B.V. All rights reserved.
• Contract Date: Oct 22, 2018