| Summary: | 碩士 === 國立臺灣大學 === 環境工程學研究所 === 85 === The adsorptions of 1,1-dichloro-1-fluoroethane (HCFC-141b)
on three different adsorbents, i.e., granular activated carbon,
activated carbon fiber and hydrophobic zeolite, respectively,
were performed. Some major physicaland chemical properties of
the adsorbents used in this study, and adsorption capacities and
breakthrough curves for the adsorption of HCFC-141b at various
temperatures and concentrations were determined. The expermental
results werecorrelated and simulated with the common adsorption
equation and Yoons'''' breakthrough model. The experimental results
indicate that the adsorption capacityis highly related to the
micropore area and volume of the adsorbents. Evidently, the
adsorption capacities for the adsorption of HCFC-141b on the
hydrophobic zeolite and the activated carbon fiber are also
affected with the surface polarity and the structure of pore.It
was found that the measured adsorption datacan be reasonably
well fitted by the Langmuir, Freundlich and Dubinin-Raduskevich
equations.The values of the parameters of the adsorption
isotherms and thethermodynamic properties of the adsorption were
thus obtained for the corresponding adsorbents, which are
consistent with the physical properties of the adsorbents. The
hydrophobic zeolite is significantly unfavorable to the
adsorption of HCFC-141b as indicated by the values of the
parameters of Freundlichisotherms. Based on the breakthrough
model of Yoon and Nelson (1992) and resultsof simulation, it is
seen that the relationship between the pore structure andthe
adsorption diffusion rate of the adsorbents can be explained by
the magnitudes of the adsorption constants of the model.
Further, it is reasonable toexpress the relationship between the
adsorption constant and the adsorptiontemperature according to
Arrhenius rate equation.
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