From Norway Spruce Bark to Carbon Foams : Characterization, and Applications
Varila, T., Brännström, H., Kilpeläinen, P., Hellström, J., Romar, H., Nurmi, J., & Lassi, U. (2020). From Norway Spruce Bark to Carbon Foams : Characterization, and Applications. BioResources, 15(2), 3651-3666. https://doi.org/10.15376/biores.15.2.3651-3666
© 2020 the Authors
Fresh bark from spruce Picea abies was milled and extracted with hot water. The extracts were purified in a number of steps in order to get tannin-extracts pure enough to prepare tannin-based carbon foams. The chemical composition of the extracts were analyzed. The foams were maturated and thermally treated to obtain desired properties, such as specific surface area, porosity, and compressive strength. It was possible to produce carbon foams even if they contained carbohydrate impurities. Differences in the properties of the carbon foams such as compressive strength, specific surface areas, and pore size distributions might be related to the compositions of the extracts. The foams were finally activated chemically and physically and were tested in adsorption of methylene blue. Results from the adsorption tests showed that adsorption was highly related to the total pore volume and the amount of mesopores created inside the foam structure during the thermal treatment.
PublisherDept. of Wood and Paper Science, College of Natural Resources, North Carolina State University
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Related funder(s)European Commission
Funding program(s)Interreg, others
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingToni Varila would like to thank the Green Bioraff Solutions Project (EU/Interreg/Botnia-Atlantica, 20201508) for funding this research. Authors from Natural Resources Institute Finland gratefully acknowledge financial support from EU/Interreg/Botnia-Atlantica within the framework of Tannins for wastewater treatment (TanWat) project (20201484).
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