Polymer-filler incompatibility, poor interfacial adhesion, and filler agglomeration affect the membrane’s structure and gas separation, limiting the use of hybrid membranes (HMs) for acid gas (CO) separation in industry. Fabrication of HMs with ligands-modified inorganic fillers improved membrane performance and morphology. Ligands-modification of MIL-125(Ti) filler with amino groups (−NHBDC) was performed to tailor the filler material’s surface properties. In continuation of prior research, we investigated the effects of non-modified and modified-ligand fillers, as well as loading variation, on functional groups and morphology. Subsequently, we conducted a pure gas permeation test using acid gas (CO) and hydrocarbons (CH) at 3.5 bar pressure to investigate the membrane gas transport properties. The research employs a dual model for CO prediction analysis, coupling established permeability models, Maxwell and Lewis-Nielsen. The synergetic effect of modified-ligands filler and optimum loading exhibited substantial CO permeability (961.77 Barrer) and gas pair selectivity (30.86) for 9.0NH-MIL-125(Ti) HM, surpassing the upper limit of 2008 Robeson plot.

中文翻译：

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促进碳氢化合物中酸性气体的去除：混合膜中的配体改性钛填料


聚合物-填料不相容性、界面附着力差和填料团聚会影响膜的结构和气体分离，限制了混合膜（HM）在工业中用于酸性气体（CO）分离的使用。用配体改性的无机填料制造 HM 可以改善膜的性能和形态。对带有氨基 (−NHBDC) 的 MIL-125(Ti) 填料进行配体改性，以调整填料的表面性能。在先前研究的延续中，我们研究了未改性和改性配体填料以及负载变化对官能团和形态的影响。随后，我们在 3.5 bar 压力下使用酸性气体 (CO) 和碳氢化合物 (CH) 进行纯气体渗透测试，以研究膜气体传输特性。该研究采用双模型进行 CO 预测分析，耦合已建立的渗透率模型 Maxwell 和 Lewis-Nielsen。改性配体填料和最佳负载的协同效应对 9.0NH-MIL-125(Ti) HM 表现出显着的 CO 渗透性 (961.77 Barrer) 和气体对选择性 (30.86)，超过了 2008 年 Robeson 图的上限。