In this study, halloysite nanotubes (HNTs) filler particles were treated in a basic solution with a pH of 11 for their better dispersion during incorporation in Pebax-1657 matrix by 1, 2, 5, 10, 15 wt.% loadings to prepare some HNTs-Pebax nanocomposite membranes. The treated HNTs were evaluated by XRD analysis and the prepared nanocomposite membranes were characterized by DSC, TGA, and FESEM analysis. Treatment of the HNTs in basic solution increased their porosity, pore volume, and specific surface area. CO₂ adsorption capacity of the raw and the modified HNTs were measured as 45.7 and 48 mol/kg adsorbent and those of CH₄ were evaluated as 34.6 and 32.4 mol/kg adsorbent, respectively. Gas permeation performance of the neat Pebax-1657 and the modified HNTs-Pebax nanocomposite membranes were investigated for CO₂/CH₄ separation. The 10 wt.% loaded raw HNTs membrane's CO₂ permeability and ideal CO₂/CH₄ selectivity increased to 132.1 Barrer and 18.6 from those for the neat Pebax as 98.4 Barrer and 13.6 while those of 10 wt.% loaded modified HNTs were measured as 144.4 Barrer and 27.2, respectively. The modified HNTs-Pebax nanocomposite membranes’ separation performance considerably approached the Robeson upper bound limit of 2008.

在这项研究中，埃洛石纳米管 (HNTs) 填料颗粒在 pH 为 11 的碱性溶液中进行处理，以使其在以 1、2、5、10、15 重量％的负载掺入 Pebax-1657 基质期间更好地分散，以制备一些HNTs-Pebax 纳米复合膜。通过 XRD 分析评估处理后的 HNT，并通过 DSC、TGA 和 FESEM 分析表征制备的纳米复合膜。在碱性溶液中处理 HNT 增加了它们的孔隙率、孔体积和比表面积。原始和改性 HNT 的CO ₂吸附容量分别测量为 45.7 和 48 mol/kg 吸附剂以及 CH ₄分别评价为 34.6 和 32.4 mol/kg 吸附剂。研究了纯 Pebax-1657 和改性 HNTs-Pebax 纳米复合膜的气体渗透性能，用于 CO ₂ /CH ₄分离。10 wt.% 负载的原始 HNTs 膜的 CO ₂渗透率和理想的 CO ₂ /CH ₄选择性从纯 Pebax 的 98.4 Barrer 和 13.6 增加到 132.1 Barrer 和 18.6，而 10 wt.% 负载的改性 HNTs 的测量结果为分别为 144.4 Barrer 和 27.2。改性 HNTs-Pebax 纳米复合膜的分离性能大大接近 2008 年的 Robeson 上限。