Journal of Wood Science

, Volume 51, Issue 1, pp 66–72

Reactivity of wood charcoal with ozone



We investigated the resistance of wood charcoal against ozone and estimated the half-life of the charcoal in air. The weight of wood charcoal prepared by the carbonization of Fagus crenata sawdust at 400°C (C-400) was not affected with up to 8.5% ozone while the charcoal prepared at 1000°C (C-1000) burned with 4.9% ozone. Pores with a diameter of approximately 100–200 nm were observed on the surface of ozone-treated C-1000 by scanning electron microscopy, although no pores were found in ozone-treated C-400. The peak positions of the C1s spectra and the full width at half maximum of X-ray photoelectron spectrum peaks suggest that C-400 has an amorphous structure composed of aliphatic carbons and small aromatic molecules while C-1000 and activated charcoal (AC) are polyaromatic. It is likely that the aromatic layers of C-1000 and AC were destroyed and the edge carbon atoms were removed as CO or CO2 by ozone oxidation. We estimated the half-life of C-1000 with ozone in air to be about 50 000 years by assuming that the weight of C-1000 decayed exponentially. Thus, it is suggested that wood charcoal is stable on a geological time scale.

Key words

Wood charcoal Ozone Stability Oxidation Half life 


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Copyright information

© The Japan Wood Research Society 2005

Authors and Affiliations

  1. 1.Biological Environment InstituteThe General Environmental Technos Co., Ltd.UjiJapan
  2. 2.Research Institute for Sustainable HumanosphereKyoto UniversityUjiJapan
  3. 3.Environmental Assessment DepartmentThe General Environmental Technos Co., Ltd.OsakaJapan

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