| Summary: | 碩士 === 國立雲林科技大學 === 工業化學與災害防治研究所 === 94 === In this thesis, the adsorption capacity of acetaldehyde onto activated carbon cloth (ACC) was investigated by a dynamic adsorption experiment method. Both phenolic resin based ACC (FT300-15) and polyacrylonitrile ACC (FAW1502) were studied. The ACCs were modified by different nitrate solutions included magnesium nitrate, cobalt nitrate, and aluminum nitrate. Some impregnated ACCs were thermally treated at different temperature for different period. A Fourier transform infrared spectroscopic (FTIR) was employed to determine the functional groups on the surface of the ACCs. A nitrogen adsorption apparatus was used to measure the specific surface area, pore size distribution and pore volume of the ACCs. A scanning electron microscopy (SEM) was employed to observe surface morphology of the ACCs. An X-ray diffraction instrument and an X-photoelectron spectrometer were employed to determine crystallization of loaded metal oxide compound and to analyze metallic ion change, respectively.
It was found that the adsorption of acetaldehyde onto the virgin FAW1502 ACC is larger than that onto the virgin FT300-15 ACC. There are rich polar functional groups on the virgin FAW1502 ACC surface to enhance interaction between acetaldehyde molecule and the ACC. The adsorption capacity of acetaldehyde onto the ACC obviously increased after metal oxide modification. The largest adsorption capacity was found onto the FT300-15 ACC modified by magnesium oxide, and was 14 times larger than that onto the virgin FT300-15 ACC. Considering operation cost, the calcination condition for magnesium nitrate and aluminum nitrate impregnated ACC were designed by 400oC for 2 hours. The calcination condition for cobalt nitrate loaded ACC was conducted by 450oC for 2 hours. The trend of acetaldehyde adsorption onto the ACCs is in the order when ACCs modified by MgO, Co3O4, Al2O3. The mathematical model proposed by Yoon et al. to predict respirator cartridge service life was used to simulate the breakthrough curves of the fixed bed adsorber. The simulation results are very good.
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