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Microwave pyrolysis of pecan nut shell and thermogravimetric, textural and spectroscopic characterization of carbonaceous products
[Display omitted] •Pyrolysis of pecan nut shell was studied by microwave heating.•Carbons were obtained in one step without any additional activation process.•The processing times with microwave heating are short.•Textural properties of carbons control the adsorption of dyes. In the present work, th...
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Published in: | Journal of analytical and applied pyrolysis 2018-10, Vol.135, p.160-168 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | [Display omitted]
•Pyrolysis of pecan nut shell was studied by microwave heating.•Carbons were obtained in one step without any additional activation process.•The processing times with microwave heating are short.•Textural properties of carbons control the adsorption of dyes.
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. |
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ISSN: | 0165-2370 1873-250X |
DOI: | 10.1016/j.jaap.2018.09.007 |