It is known that the use of the Dubinin–Radushkevich method in micro-mesoporous samples does not give adequate values of micropore volumes, unlike when the samples contain only microporous. Based on that, in this work, we propose an easy method to calculate a reliable micropore volume (V_μP) of micro-mesoporous (nanopores) samples, separating the microporous region from the experimental isotherm. For this, the original isotherm is modified, estimating the thickness of the adsorbed layer (t) as a function of relative pressure and changing the external surface area (S_ext) to obtain a Type I adsorption isotherm in the microporous region; then, the DR method can be applied to the modified isotherm. This proposal, named the DR_t method, allows the calculation of a reliable V_μP of any nanoporous material using different adsorbates. Using this method, we analyzed adsorbents of distinct nature (i.e., carbons and silicas) with different adsorbates as N₂ and O₂ at 77 K, Ar at 87 K, and CO₂ at 273 K. We used this method to calculate V_μP in different samples and compare them with those obtained with the traditional DR method, highlighting that unlike the latter the DR_t method showed similar and consistent results with the different adsorbates. Therefore, the values of micropore volume calculated using the DR_t method demonstrate consistency across various adsorbates, not only for N₂ but especially for CO₂, which is suggested to analyze narrow micropore volumes.

众所周知，与仅包含微孔的样品不同，在微介孔样品中使用 Dubinin-Radushkevich 方法不能给出足够的微孔体积值。基于此，在这项工作中，我们提出了一种简单的方法来计算微介孔（纳米孔）样品的可靠微孔体积（V _μP），将微孔区域与实验等温线分开。为此，修改原始等温线，估计吸附层的厚度（t）作为相对压力的函数，并改变外表面积（Sext）以获得微孔区域的I型吸附等温线_；然后，可以将 DR 方法应用于修改后的等温线。该提案名为DR_t 方法，允许使用不同吸附物计算任何纳米多孔材料的可靠V _μP。使用该方法，我们分析了具有不同吸附物的不同性质的吸附剂（即碳和二氧化硅），如 77 K 下的 N _2和O 2、87 K 下的 Ar 和 273 K 下的 CO _2。我们使用该方法计算了V _μP并将它们与传统 DR 方法获得的结果进行比较，强调与后者不同，DR_t 方法对不同的吸附物显示出相似且一致的结果。因此，使用 DR_t 方法计算的微孔体积值证明了各种吸附物的一致性，不仅对于 N ₂，而且特别对于 CO ₂，​​这建议用于分析狭窄的微孔体积。