Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2620, Ciudad Universitaria, (C1428BGA) Buenos Aires, Argentina.
J Hazard Mater. 2010 May 15;177(1-3):175-82. doi: 10.1016/j.jhazmat.2009.12.014. Epub 2009 Dec 11.
Activated carbon cloths (ACC) were prepared from lyocell, a novel regenerated cellulose nanofibre fabric, by phosphoric acid activation in inert atmosphere at two different final thermal treatment temperatures (864 and 963 degrees C). Benzene, toluene and n-hexane isotherms at 298 and 273K were measured in order to gain insight into the porous structure of the ACC and to evaluate their performance for the removal of volatile organic compounds (VOCs). The Dubinin-Radushkevich equation was employed to evaluate textural parameters of the ACC. The textural characteristics of the ACC were compared with those previously determined from nitrogen (77K) and carbon dioxide (273K) adsorption data. The samples were essentially microporous. The textural parameters calculated from the hydrocarbon isotherms were in good agreement with those evaluated from nitrogen isotherms for the ACC with the wider microporosity. Additionally, the Freundlich model provided a good description of the experimental isotherms for the three volatile organic compounds. The ACC obtained at the higher temperature exhibited a larger adsorption capacity. The ACC were also electrically conductive and showed potential for regeneration by the Joule effect, as determined from macroscopic electrical measurements before and after n-hexane adsorption.
活性炭布（ACC）是由新型再生纤维素纳米纤维织物——纤维素制成的，通过在惰性气氛中用磷酸进行活化，并在两个不同的最终热处理温度（864 和 963°C）下进行处理。在 298 和 273K 下测量了苯、甲苯和正己烷的等温线，以深入了解 ACC 的多孔结构，并评估它们对挥发性有机化合物（VOCs）的去除性能。Dubinin-Radushkevich 方程用于评估 ACC 的结构参数。将 ACC 的结构特征与之前从氮气（77K）和二氧化碳（273K）吸附数据确定的特征进行了比较。这些样品主要是微孔的。从烃类等温线计算出的结构参数与从氮等温线评估的微孔较宽的 ACC 的结构参数非常吻合。此外，对于三种挥发性有机化合物，Freundlich 模型很好地描述了实验等温线。在较高温度下获得的 ACC 表现出更大的吸附能力。通过宏观电测量，在正己烷吸附前后，ACC 还具有导电性，并显示出通过焦耳效应进行再生的潜力。
