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Influence of the Hydrothermal Pre-treatments on the Adsorption Characteristics of Activated Carbons from Woods |
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| Authors: | Noboru Ishibashi Kazuyoshi Yamamoto Hiroyuki Wakisaka Yutaka Kawahara |
| Institution: | 1. Division of Environmental Engineering Science, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma, 376-8515, Japan 2. Research Lab, Carbo-tec. Co. Ltd., 305, Creation Core Kyoto Mikuruma, 448-5, Kajii, Kamigyo-ku, Kyoto, 602-0841, Japan 3. North Eastern Industrial Research Center of Shiga Prefecture, 27-39, Mitsuyamotomachi, Nagahama, Shiga, 526-0024, Japan 4. The Center for Fiber and Textile Science, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, 606-8585, Japan |
| Abstract: | The hydrothermal treatments were conducted prior to the carbonization of oak woods and the obtained charcoals were activated using carbon dioxide or water vapor. The hydrothermal treatments brought about the elutions of acid-soluble lignin fractions as well as hemicellulose fractions accompanied with the decomposition of lignin carbohydrate complexes in the cell walls, which lowered not only the carbon yield of charcoal but also the crystal parameters for the carbon crystallites. However, the activated carbons (AC) produced via the hydrothermal pre-treatment showed superior adsorption properties especially for the adsorptions of 2-methylisoborneol and geosmin as compared with the untreated commercial AC. The hydrothermal treatments prior to the carbonization have some potential to increase the fractions of meso-pores effective for the adsorption of globular shaped molecules. |
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