A1 Journal article (refereed)
From Norway Spruce Bark to Carbon Foams : Characterization, and Applications (2020)

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

JYU authors or editors

Publication details

All authors or editorsVarila, Toni; Brännström, Hanna; Kilpeläinen, Petri; Hellström, Jarkko; Romar, Henrik; Nurmi, Juha; Lassi, Ulla

Journal or seriesBioResources


Publication year2020


Issue number2

Pages range3651-3666

PublisherDept. of Wood and Paper Science, College of Natural Resources, North Carolina State University

Publication countryUnited States

Publication languageEnglish


Publication open accessOpenly available

Publication channel open accessOpen Access channel

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/71397


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.

Keywordsbiomass (industry)barkNorway spruceextraction (chemistry)tanninsfoamsbiomaterialsporosityadsorption

Free keywordsbark; biomass; carbon foams; extractives; spruce; tannins

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Related projects

Ministry reportingYes

Reporting Year2020

JUFO rating1

Last updated on 2024-22-04 at 12:03