An activated carbon with high micro and mesoporosity, as well as a high bulk density, was fabricated by activating the extrusion-molded precursor made from carbonized rice husk (RH) and beet sugar (BS) at 850℃ in CO_2. The pore structure of this RH-based activated carbon (RHAC) was analyzed in relation to the bulk density. The extrusion molding and the use of BS syrup were useful to attain those superior properties. RHAC which was first activated for 1 h was immersed again in the BS syrup and then activated in CO_2 for 2 h. This two-step activation process provided both a high bulk density (0.93 g/cm^3) and a highly textured structure (micropore volume: 0.29 cm^3/g, mesopore volume:0.19 cm^3/g, BET specific surface area: 844 m^2/g).
1 0 0 0 OA 籾殻炭のアルデヒド類ガスの吸着効果
- 著者
- 熊谷 誠治 佐々木 恵司 清水 良枝 武田 紘一
- 出版者
- 日本素材物性学会
- 雑誌
- 素材物性学雑誌 (ISSN:09199853)
- 巻号頁・発行日
- vol.20, no.2, pp.34-38, 2007-12-28 (Released:2010-10-28)
- 参考文献数
- 18
- 被引用文献数
- 4 4
Japanese rice husk was converted into an adsorbent for the removal of two types of aldehyde vapors. The rice husks carbonized at 250-800°C in N2 for 1h were exposed to vapors containing 1.0 vol. ppm formaldehyde or 100 vol. ppm acetaldehyde (both N2 carrier) in 5 L-gas sampling bags. Maximum adsorption rates of formaldehyde and acetaldehyde were observed for rice husks carbonized at 800 and 600°C, respectively. The adsorption rates of the aldehydes on the carbonized rice husks were higher than or comparable to those of the commercial granular coconut-shell activated carbon (GCSAC), whereas the specific surface area and the total pore volume of the carbonized rice husks were much lower than that of the GCSAC. The surface basic property of the rice husks carbonized at high temperatures was attributed to the intrinsic inorganic matters of K and Ca, which enhanced an uptake of the aldehydes on their surfaces.