Micropore structure of wood and bamboo charcoals: Establishment of a method for the calculation of effective pore size distribution and the possibility of controlling micropore structure
2006
Akitomo, M.(Kyoto Prefectural Univ. (Japan)) | Suzuki, R. | Ishimaru, Y. | Iida, I. | Furuta, Y.
Adsorption of C02 gas onto charcoals was studied at the ice-water temperature (273 K) in order to establish a method for a reliable determination of pore size distributions in charcoals from wood and bamboo. The pore size distributions were determined by analyzing adsorption isotherms using the HK method (Horvath-Kawazoe method). The pore size distributions obtained were highly reproducible and reliable, and peaks of pore size distributions in the charcoals were found at about 0.5 nm. Based on size, these micropores in charcoals were judged to result from a disordered-graphite-like structure. It was previously found that wood and bamboo charcoals have only a small amount of mesopores and no peak of the distribution in the mesopore region. From the previous and the present results, it can be concluded that the micropores mentioned above are responsible for a steep increase found in the adsorption isotherms of water vapor in a range of about 40 to 60% relative humidity. Pore size distributions were also determined for the charcoals from wood pretreated with polyethylene glycol (PEG) , as an attempt to obtain some information about the possibility of controlling micropore structure in wood and bamboo charcoals. A small increase in larger pores above 0.5 nm was found in the pretreated charcoals as compared to the untreated charcoals.
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