以 KOH 活化法从底灰中未燃烧的煤制备用于液相吸附的活性炭。
Preparation of activated carbons from unburnt coal in bottom ash with KOH activation for liquid-phase adsorption.
机构信息
Department of Chemical Engineering, National United University, Miao-Li 360, Taiwan.
出版信息
J Environ Manage. 2010 May;91(5):1097-102. doi: 10.1016/j.jenvman.2009.12.011. Epub 2010 Feb 8.
In this work, unburnt coal (UC) in bottom ash from coal-fired power plants was soaked in KOH solution and activated for 1 h at 780 degrees C. The yield of activated carbons varied from 47.8 to 54.8% when the KOH/UC weight ratio changed from 2 to 4. Pore properties of these activated carbons including the BET surface area, pore volume, pore size distribution, and pore diameter were characterized based on N(2) adsorption isotherms. It was shown that the isotherms for the adsorption of methylene blue, acid blue 74, and 4-chlorophenol from aqueous solutions on these activated carbons at 30 degrees C were well fitted by the Langmuir equation (correlation coefficient r(2) > 0.9968). The adsorption capacities of methylene blue, acid blue 74, and 4-chlorophenol were obtained to be 2.40-2.88, 0.57-1.29, and 2.34-5.62 mmol/g, respectively. Moreover, the adsorption kinetics could be suitably described by the Elovich equation.
在这项工作中，将燃煤电厂底灰中的未燃烧煤（UC）浸泡在 KOH 溶液中，并在 780°C 下活化 1 小时。当 KOH/UC 重量比从 2 变为 4 时，活性炭的产率从 47.8%变化到 54.8%。这些活性炭的孔性能，包括 BET 比表面积、孔体积、孔径分布和孔径，都是根据 N(2)吸附等温线来表征的。结果表明，在 30°C 下，这些活性炭对水溶液中亚甲蓝、酸性蓝 74 和 4-氯苯酚的吸附等温线均很好地符合朗缪尔方程（相关系数 r(2)＞0.9968）。亚甲蓝、酸性蓝 74 和 4-氯苯酚的吸附容量分别为 2.40-2.88、0.57-1.29 和 2.34-5.62 mmol/g。此外，吸附动力学可以很好地用 Elovich 方程来描述。
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