Abstract We developed highly selective polyurethane (PU) membranes with incorporated NiO nanoparticles for gas-phase carbon dioxide separation. PU was synthesized with polytetramethylene glycol and isophoronediisocyanate, and 1,4-butandiamine/1,4-butandiol as the chain extender (1:3:2 molar ratio). Mixed matrix membranes (MMMs) composed of PU and NiO nanoparticles were fabricated using the solution casting method. Scanning electron microscopy (SEM) confirmed the even distribution of NiO in the PU matrix at the nanoscale. Fourier transform infrared (FTIR) spectroscopy and differential scanning calorimetry (DSC) were used to examine the phase separation between the soft and hard domains of PU, and the distribution of NiO nanoparticles in both domains. DSC and X-ray diffraction (XRD) pattern confirmed that the crystalline structures in both soft and hard segments are changed by NiO incorporation. The effects of NiO nanoparticles on the gas permeability, diffusivity, and solubility of pure CO2, CH4, O2, and N2 gases were studied at various temperatures and feed pressures. A large increase in the CO2/N2 permselectivity with a simultaneous reduction in the gas permeability of CH4, O2, and N2 was observed. When the NiO content was low (1 wt%), the CO2/N2 permselectivity increased by 79.21%, and the CO2 permeability increased by 1.57%. Increasing the nanoparticle load to 5 wt% increased the CO2/N2 permselectivity by 161.1%, while the CO2 permeability was decreased by 3.31%.

中文翻译：

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用于分离 CO 2 气体的聚氨酯与氧化镍纳米颗粒的混合基质膜

摘要 我们开发了高选择性聚氨酯 (PU) 膜，其中包含用于气相二氧化碳分离的 NiO 纳米粒子。以聚丁二醇和异佛尔酮二异氰酸酯，1,4-丁二胺/1,4-丁二醇为扩链剂（摩尔比1:3:2）合成PU。使用溶液浇铸方法制造由 PU 和 NiO 纳米颗粒组成的混合基质膜 (MMM)。扫描电子显微镜 (SEM) 证实了 NiO 在 PU 基质中纳米级的均匀分布。傅里叶变换红外 (FTIR) 光谱和差示扫描量热法 (DSC) 用于检查 PU 软域和硬域之间的相分离，以及 NiO 纳米粒子在两个域中的分布。DSC 和 X 射线衍射 (XRD) 图案证实软段和硬段中的晶体结构都因 NiO 掺入而改变。在各种温度和进料压力下，研究了 NiO 纳米颗粒对纯 CO2、CH4、O2 和 N2 气体的气体渗透性、扩散性和溶解度的影响。观察到 CO2/N2 渗透选择性大幅增加，同时 CH4、O2 和 N2 的气体渗透率降低。当 NiO 含量较低（1 wt%）时，CO2/N2 选择性渗透率提高 79.21%，CO2 渗透率提高 1.57%。将纳米颗粒负载量增加到 5 wt%，CO2/N2 选择性渗透率提高了 161.1%，而 CO2 渗透率降低了 3.31%。在不同的温度和进料压力下研究了纯 CO2、CH4、O2 和 N2 气体的溶解度和溶解度。观察到 CO2/N2 渗透选择性大幅增加，同时 CH4、O2 和 N2 的气体渗透率降低。当 NiO 含量较低（1 wt%）时，CO2/N2 选择性渗透率提高 79.21%，CO2 渗透率提高 1.57%。将纳米颗粒负载量增加到 5 wt%，CO2/N2 选择性渗透率提高了 161.1%，而 CO2 渗透率降低了 3.31%。在不同的温度和进料压力下研究了纯 CO2、CH4、O2 和 N2 气体的溶解度和溶解度。观察到 CO2/N2 渗透选择性大幅增加，同时 CH4、O2 和 N2 的气体渗透率降低。当 NiO 含量较低（1 wt%）时，CO2/N2 选择性渗透率提高 79.21%，CO2 渗透率提高 1.57%。将纳米颗粒负载量增加到 5 wt%，CO2/N2 选择性渗透率提高了 161.1%，而 CO2 渗透率降低了 3.31%。CO2 渗透率提高了 1.57%。将纳米颗粒负载量增加到 5 wt%，CO2/N2 选择性渗透率提高了 161.1%，而 CO2 渗透率降低了 3.31%。CO2 渗透率提高了 1.57%。将纳米颗粒负载量增加到 5 wt%，CO2/N2 选择性渗透率提高了 161.1%，而 CO2 渗透率降低了 3.31%。