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Adsorption of toluene and acetone vapors on microwave-prepared activated carbon from agricultural residues: isotherms, kinetics, and thermodynamics studies

机译:农残中微波制备的活性炭对甲苯和丙酮蒸气的吸附:等温线,动力学和热力学研究

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摘要

Activated carbons produced with agricultural residues have attracted substantial attention in recent years. However, much work remains to be done. The current study determined the adsorption isotherms for toluene and acetone vapors for pinewood chip-derived activated carbon. The effects on the physical properties, such as the porous structures of the adsorbents, were also investigated using scanning electron microscopy (SEM). The results indicate that the activated carbon is a mainly microporous structure with a micropore volume of 0.701 cc/g (75.1 % of the total pore volume). The adsorption capacities of toluene and acetone can be as high as 0.71 and 0.57 g/g at room temperature, respectively. The adsorption isotherms for toluene and acetone vapors were obtained from 25 to 45 A degrees C, with relative pressures between 0.01 and 0.9. As the temperature increased, the adsorption capacity decreased. This behavior indicates that the adsorption process is physical adsorption. The fitted isotherms using the Dubinin-Radushkevich adsorption models exhibited low mean total relative errors. The fitted isotherms obtained using the Dubinin-Radushkevich adsorption models had mean total relative errors of 3.3 and 4.1 % for the adsorption of toluene and acetone, respectively, at temperatures ranging from 25 to 45 A degrees C. The results of this study may be highly significant because they provide a more accurate prediction of the adsorption capacities of the adsorbents, thus improving the design of adsorption systems.
机译:近年来,由农业残留物生产的活性炭引起了极大的关注。但是,还有很多工作要做。目前的研究确定了松木片衍生的活性炭对甲苯和丙酮蒸气的吸附等温线。还使用扫描电子显微镜(SEM)研究了对物理性能(如吸附剂的多孔结构)的影响。结果表明,活性炭是主要为微孔结构,微孔体积为0.701cc / g(占总孔体积的75.1%)。在室温下,甲苯和丙酮的吸附容量可以分别高达0.71和0.57 g / g。甲苯和丙酮蒸气的吸附等温线是在25至45 A摄氏度下获得的,相对压力为0.01至0.9。随着温度升高,吸附容量降低。此行为表明吸附过程是物理吸附。使用Dubinin-Radushkevich吸附模型拟合的等温线显示出较低的平均总相对误差。使用Dubinin-Radushkevich吸附模型获得的拟合等温线在25至45 A的温度范围内,甲苯和丙酮的吸附的平均总相对误差分别为3.3和4.1%。该研究的结果可能是高度正确的之所以具有重要意义,是因为它们可以更准确地预测吸附剂的吸附能力,从而改善吸附系统的设计。

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