Reactivity of wood charcoal with ozone |
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Authors: | Kunio Kawamoto Kengo Ishimaru Yuji Imamura |
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Institution: | (1) Biological Environment Institute, The General Environmental Technos Co., Ltd., Uji 611-0021, Japan;(2) Research Institute for Sustainable Humanosphere, Kyoto University, Uji 611-0011, Japan;(3) Present address: Environmental Assessment Department, The General Environmental Technos Co., Ltd., 1-3-5 Azuchimachi, Chuo-ku, Osaka 541-0052, Japan |
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Abstract: | 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. |
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Keywords: | Wood charcoal Ozone Stability Oxidation Half life |
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