Influence of moisture content on NO2 sorption ability of cedar wood

• Published in: Journal of wood science 2021-12, Vol.67 (1), p.1-10, Article 37
• Main Authors: Nakagawa, Miyuki, Kawai, Shuichi, Kanayama, Kozo, Umemura, Kenji
• Format: Article
• Language: English
• Subjects: Aeration; Biomedical and Life Sciences; Cedar; Characterization and Evaluation of Materials; Japanese cedar wood; Life Sciences; Materials Science; Moisture content; Multilayers; Nitric acid; Nitrogen dioxide; Nitrogen dioxide (NO2) sorption; Original Article; Sorption; Water chemistry; Wood Science & Technology
• ISSN: 1435-0211; 1611-4663
• DOI: 10.1186/s10086-021-01961-z

This study examined the influence of moisture content (MC) on NO 2 sorption ability of cedar ( Cryptomeria japonica ) wood using the specimens with different MCs. Four MC conditions were applied, namely 0%, 8.6%, 12.7% and 16.5%, based on the differences of bonding condition of water molecule in the wood substances. As a result, the NO 2 sorption volume increased drastically due to the presence of water, and as the MC increased, the NO 2 sorption volume increased slightly. The NO generation volume and nitric acid concentration in the specimens were evaluated after an aeration test, and it was strongly indicated that the NO 2 reacted with water in the specimen, and that the NO generation volume increased as the content of multilayer adsorbed water increased. The nitric acid seemed to be formed by the reaction between NO 2 and water, and it was then held in the specimen. Based on the NO 2 sorption volume calculated using the NO generation volume, it was shown that the NO 2 sorption after 12-h aeration was caused mainly by the reaction between NO 2 and water. Furthermore, the presence of both water and extractives contributed to the NO 2 sorption in the initial period, and the presence of water contributed greatly to the NO 2 sorption over the long term.