An amino acid salt is selected as an effective carrier and is introduced into polymer matrix to fabricate facilitated transport membranes for enhancing CO₂ separation performance. In this research, a series of Pebax^® MH 1657 (Pebax^®) membranes containing sodium glycine (SG) are fabricated. The Pebax^®-SG membranes show higher CO₂ permeability and CO₂/gas selectivity than pure Pebax^® membrane. The introduced SG plays two crucial roles in membranes. On one hand, SG provides simultaneously abundant amino groups (-NH₂) and carboxylate groups (−COO⁻) as carriers for facilitating CO₂ transport, imparting an enhanced CO₂ separation performance via a facilitated transport mechanism. On the other hand, the addition of SG increases the total amount of absorbed water, resulting in the swelling of membrane matrix and the increase of CO₂ solubility. In particular, CO₂ permeability increases almost linearly with the increase of water content in membranes. As a consequence, the as-prepared Pebax^®-SG-15 membrane shows the highest CO₂ permeability of 1023 Barrer, CO₂/CH₄ ideal selectivity of 46 (separation factor of 43) and CO₂/N₂ ideal selectivity of 91 (separation factor of 84) at 2 bar and 25 °C, supassing the 2008 Robeson upper bound line. All ideal selectivites are higher than their coresponding separation factors. The membranes containing amino acid salt show a potential application for CO₂ separation.

选择一种氨基酸盐作为有效的载体，并将其引入聚合物基质中以制造促进传输的膜，以增强CO ₂分离性能。在这项研究中，一系列的Pebax的^® MH 1657（的Pebax ^®含有甘氨酸钠（SG））膜制成。所述的Pebax ^® -SG膜显示出较高的CO ₂渗透率和CO ₂ /气体选择性比纯的Pebax ^®膜。引入的SG在膜中起两个关键作用。一方面，SG提供同时丰富氨基（-NH ₂）和羧酸酯基团（-COO ^- ）作为载体用于促进CO ₂通过便利的运输机制，提高了CO _2的分离性能。另一方面，SG的添加增加了吸收的水的总量，导致膜基质的溶胀和CO ₂溶解度的增加。特别地，CO ₂渗透性几乎随着膜中水含量的增加线性增加。因此，所制备的Pebax ^® -SG-15膜显示了最高的CO ₂渗透性1023巴雷，CO的₂ / CH ₄的46理想选择性（43分离因子）和CO ₂ / N ₂在2 bar和25°C下的理想选择性为91（分离系数为84），超过了2008 Robeson上限线。所有理想的选择性都高于其相应的分离因子。含有氨基酸盐的膜显示出潜在的CO ₂分离应用。