Abstract Harvesting energy from biogas is a potential way to retard the depletion of fossil fuels and fight against global warming simultaneously. Membrane technology holds great promise to achieve cost-effective biogas upgrading, along with advantages of low energy consumption and environmental friendliness, which leads to extensive exploration in fabricating CO2 membranes with high separation performance. In this study, mixed matrix membranes are fabricated by incorporating exfoliation-free layered double hydroxides laminates intercalated with amino acids (Phe with hydrophobic side chains and Glu with hydrophilic side chains) into a low-cost commercial Pebax (poly (amide-b-ethylene oxide)) polymer. Both amino and carboxyl groups can facilitate the transport of CO2 through quadrupole moment interaction, enlarged interlayer spacing and reversible reaction. Particularly, MMM containing 5 wt% AA-LDH exhibits an optimal permeability of 790 Barrer and a promising CO2/CH4 selectivity of 31, which is 64.6% and 83.9% higher than the pristine Pebax membrane, respectively. The distinct advantages in terms of facile fabrication and processability confer the LDH-based membrane with great potential for large-scale CO2 capture and separation.

中文翻译：

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嵌入氨基酸的无剥离层状双氢氧化物层压板可增强混合基质膜的 CO2 分离

摘要 从沼气中获取能量是延缓化石燃料枯竭和同时对抗全球变暖的一种潜在方式。膜技术有望实现具有成本效益的沼气升级，以及低能耗和环境友好的优势，这导致在制造具有高分离性能的 CO2 膜方面进行了广泛的探索。在这项研究中，混合基质膜是通过将插入有氨基酸（具有疏水侧链的 Phe 和具有亲水侧链的 Glu）的无剥离层状双氢氧化物层压材料制成低成本商业 Pebax（聚（酰胺-b-乙烯）氧化物)) 聚合物。氨基和羧基都可以通过四极矩相互作用促进 CO2 的传输，增大的层间距和可逆反应。特别是，含有 5 wt% AA-LDH 的 MMM 表现出 790 Barrer 的最佳渗透率和 31 的有希望的 CO2/CH4 选择性，分别比原始 Pebax 膜高 64.6% 和 83.9%。在易于制造和可加工性方面的独特优势赋予基于 LDH 的膜用于大规模 CO2 捕获和分离的巨大潜力。