| Summary: | 碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程所 === 98 === Activated carbon has been referred to as one of the most extensively used adsorbents with a wide range of pore size distribution. Using noncarbonaceous materials as templates to prepare porous carbons with micro or nanopores has been considered a innovative technology. In this study, novel carbon materials were synthesized with zeolite Y, montmorillonite and activated clay as templates and sucrose as carbon precursor. The preparation method included incipient wetness impregnation, polymerization, carbonization, and removal of template using acid. The influences of type of starting templates, sucrose concentration, and temperature on the resulting surface area, pore volume and pore size distribution of carbon products were further discussed. Results showed the all of the resulting carbon samples contain a narrow micropore distribution, with a peak at 0.9 nm, indicating the homogenity of pore size distribution. Compared to the starting zeolite materials, only total pore volume was significantly enhanced for the resulting carbon products. However, both total pore volume and surface area were improved for montmorillonite carbon. The structure of carbon material was highly different with those of templates according to XRD and SEM examinations. Carbon contents were increased with increasing carbonization temperature. The surface functional group is mainly in acidic forms, namely, hydroxyl, carbonyl, and carboxyl groups.
Results from toluene adsorption tests (1,000-4,000 ppmv, 30-90 ℃) indicated that the adsorption capacities increased with increasing toluene concentration, but decreased with temperature. Model simulation showed that the observed adsorption isotherm highly correlated to Langmuir, Freundlich and DR equations. These modeling parameters can be used to predict the toluene adsorption capacity at a variety of concentration and temperature range.
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