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Carbonaceous structural changes of wood induced by microwave irradiation
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Published/Copyright:
July 25, 2011
Abstract
The objective of this study was to investigate the carbonization induced by microwave treatment (MWT) of spruce (Picea sp.) wood, which was treated in a domestic microwave oven at 2.45 GHz. Structural changes were observed by elemental analysis, thermal analysis, and by IR and Raman spectroscopy. The degradation of the samples was completed within 3 min. The carbonization was comparable to that caused by heat treatment at ca. 420°C. In the MWT samples, a graphitic layer was not detected, which behaves as a sensitizer for MW irradiation and sometime elevates the temperature drastically. This study shows that MWT leads to a carbonaceous material, and that the carbonization levels off with the loss of heat-inducing functional groups, such as O-H, CO-OH, C=O, upon MW irradiation. MWT is better suited as a kind of controlled and short pretreatment method before carbonization. Its suitability for porous absorbents should be investigated.
Keywords: charcoal; differential thermal analysis (DTA); FT-IR spectroscopy; microwave irradiation; pyrolysis; Raman spectroscopy
Received: 2010-5-19
Accepted: 2011-6-21
Published Online: 2011-07-25
Published in Print: 2012-01-01
©2012 by Walter de Gruyter Berlin Boston
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Keywords for this article
charcoal;
differential thermal analysis (DTA);
FT-IR spectroscopy;
microwave irradiation;
pyrolysis;
Raman spectroscopy
Articles in the same Issue
- Original Papers
- Novel paper sizing agents based on renewables. Part 5: characterization of maleated oleates by ozonolysis
- Polythiophene-cellulose composites: synthesis, optical properties and homogeneous oxidative co-polymerization
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- A rheological description of the water vapour sorption kinetics behaviour of wood invoking a model using a canonical assembly of Kelvin-Voigt elements and a possible link with sorption hysteresis
- Changes in chemistry, color, dimensional stability and fungal resistance of Pinus radiata D. Don wood with oil heat-treatment
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