Characterizing the Adsorption Behaviors of Various Adsorbates on Activated Carbons via the Multi-layer Theory

以多層理論分析活性碳吸附系統之特性行為

王振興(Cheng-Hsing Wang) ； 黃炳照(Bing-Joe Hwang)

《Journal of the Chinese Institute of Chemical Engineers》 31卷4期 (2000/07) Pp. 333-338

https://doi.org/10.6967/JCICE.200007.0333

摘要

本文應用王氏與黃氏所發展的多層吸附模式，對烷類化合物、硫化氫與一氧化碳等被吸附在活性碳之吸附特性作深入探討。有關活性碳吸附系統之參數與吸附能力等特性，例如飽和吸附量、平衡常數、異構能及能量不均度等，皆可由該模式求得。在烷類吸附在纖維活性碳之系統方面，研究顯示熱膨脹係數與第一吸附層不衡常數隨碳數增加而增加；然而，飽和容量與能量不均度隨碳數增加而減少。在ＰＣＢ活性碳為吸附劑之吸附系統中，研究顯示極性被吸附物第一吸附層之能量不均度比非極性被吸附物大，然而外層吸附則相反。極性外層被吸附分子間作用力大於非極性外層被吸附分子間作用力，同時極性分子吸附系統比非極性分子吸附系統傾向多層吸附。

並列摘要

Wang and Hwang's multi-layer adsorption model provides a deep insight into the adsorption characteristics of various adsorbates involving alkanes, hydrogen sulfide and carbon monoxide on activated carbons. The adsorption parameters of the activated carbons correlated with the adsorbing ability of activated carbon, such as the saturated adsorption capacity, equilibrium constants, isosteric heat and energy heterogeneity, are obtained. The results show that the thermal expansion coefficient and the equilibrium constant for the first adsorption layer increases with carbon number but the saturated adsorption capacity and the energy heterogeneity decrease with carbon number in the alkane system adsorbed on the fiber activated carbon. The energy heterogeneity of the first adsorption layer for the polar adsorbate is less than that for the non-polar adsorbate on the PCB activated carbon. But the reverse is true for the outer-layer adsorption. The polar adsorbate is more easily adsorbed on the PCB activated carbon than the non-polar adsorbate. It is found that the interaction between the polar admolecules is stronger than that for the non-polar ones, and tkad1orption for polar adsorbate more easily tends to a multi-layer adsorption than that for the non-polar adsorbate on the PCB activated carbon.

並列關鍵字

Adsorption ； Multi-layer ； Activated Carbon ； Alkanes ； Hydrogen Sulfide ； Carbon Monoxide