Equilibrium and dynamic vapour water sorption properties of biochar derived from apple wood

Popescu, C-M; Hill, CAS; Anthony, RVE; Ormondroyd, G; Curling, S

Abstract

The water vapour sorption properties of biochar derived from apple wood (Malus sp.) have been studied.
The biochar used in the study were formed from wood samples taken from different parts of the trunk
and they exhibited different cell wall densities and surface area values when charred under identical
conditions. The water vapour adsorption and desorption characteristics of the biochar were investigated
over the relative pressure range P/Po ¼ 0e0.95 in a dynamic vapour sorption apparatus and the kinetics
was analysed in terms of the parallel exponential kinetics (PEK) model. The PEK model comprises two
exponential sorption kinetic terms which are termed fast and slow sorption processes. The fast process is
attributed to a linear driving force mass transfer diffusion model, while the slow process is attributed to a
relaxation-limited kinetic process. Markedly different sorption behaviour was found between the biochar
samples, which had been produced under identical conditions.

Citation

Popescu, C., Hill, C., Anthony, R., Ormondroyd, G., & Curling, S. (2015). Equilibrium and dynamic vapour water sorption properties of biochar derived from apple wood. Polymer Degradation and Stability, 111, 263-268. https://doi.org/10.1016/j.polymdegradstab.2014.10.014

• Journal Article Type: Article
• Acceptance Date: Oct 15, 2014
• Online Publication Date: Oct 24, 2014
• Publication Date: Jan 1, 2015
• Deposit Date: Apr 8, 2020
• Journal: Polymer Degradation and Stability
• Print ISSN: 0141-3910
• Publisher: Elsevier
• Volume: 111
• Pages: 263-268
• DOI: https://doi.org/10.1016/j.polymdegradstab.2014.10.014
• Publisher URL: https://doi.org/10.1016/j.polymdegradstab.2014.10.014
• Related Public URLs: https://www.sciencedirect.com/journal/polymer-degradation-and-stability