Volatile methylsiloxanes (VMS) are a special kind of impurity that exist in biogas and seriously hamper its utilization; therefore, their removal has attracted great attention in recent years. Adsorption is the only technology that is currently capable of industrial-scale removal of VMS. In this research, three carbons with various porous structures, including ordered mesoporous carbon (OMC), activated carbon fiber (ACF) and granular activated carbon (GAC), were selected as potential adsorbents to investigate their adsorption properties toward hexamethyldisiloxane (L2), which is a typical linear VMS pollutant. The adsorption isotherms and kinetics of L2 on the three carbons were studied, and the isosteric heats of adsorption were calculated in accordance with the isotherms under different temperatures by using the Van't Hoff equation. Additionally, the influences of the topological structures of the carbons on the adsorption kinetics were compared. Generally, adsorption isotherms of the three carbons can be well-fitted by the Dubinin-Astakhov equation, and the variation of the isosteric heats and adsorption kinetics are presumed to be closely related to the pore sizes of the carbons. These new findings reveal the adsorption mechanisms of L2 on carbons and make it possible that the proper adsorption system is set up to fulfill higher removal efficiency.

中文翻译：

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六甲基二硅氧烷在碳上的气态吸附：等温线，等排热和动力学。

挥发性甲基硅氧烷（VMS）是沼气中存在的一种特殊杂质，会严重阻碍其利用。因此，近年来将其去除引起了极大的关注。吸附是目前唯一能够工业规模去除VMS的技术。在这项研究中，选择了三种具有各种多孔结构的碳，包括有序介孔碳（OMC），活性碳纤维（ACF）和颗粒状活性碳（GAC）作为潜在的吸附剂，以研究它们对六甲基二硅氧烷（L2）的吸附性能。是典型的线性VMS污染物。研究了L2在这三个碳原子上的吸附等温线和动力学，并使用Van't Hoff方程根据不同温度下的等温线计算了吸附等温线。此外，比较了碳的拓扑结构对吸附动力学的影响。通常，可以通过Dubinin-Astakhov方程很好地拟合这三种碳的吸附等温线，并且推测等构热和吸附动力学的变化与碳的孔径密切相关。这些新发现揭示了L2在碳上的吸附机理，并有可能建立适当的吸附系统以满足更高的去除效率。推测等构热和吸附动力学的变化与碳的孔径密切相关。这些新发现揭示了L2在碳上的吸附机理，并有可能建立适当的吸附系统以满足更高的去除效率。推测等构热和吸附动力学的变化与碳的孔径密切相关。这些新发现揭示了L2在碳上的吸附机理，并有可能建立适当的吸附系统以满足更高的去除效率。