Abstract The research quest in carbon dioxide (CO 2 ) separation technology through the polymeric membrane is intensive at this time of energy and environmental crisis. But, the pursuit of membranes with high selectivity and flux without trading it off for stability, still exists as a challenge. We report a novel membrane prepared by rational blending of two biopolymers: chitosan (CS) that acts as a matrix and silk fibroin (SF) that aids chitosan as a carrier for facilitated transport. The separation of binary gas mixture (CO 2 /N 2 ) has been studied at temperature, feed absolute pressure and sweep water flow rate ranging from 60 to 120 °C, 2 to 5.93 bar and 0.01 to 0.07 ml/min, respectively. The optimum CO 2 permeance of 140 GPU and CO 2 /N 2 selectivity of 103 for binary gas were observed at 90 °C and 0.05 ml/min of sweep water flow rate for the membrane containing 45 wt% of SF in blend with CS (SF45). The SF45 composite membrane exhibited CO 2 permeance of 123 GPU and selectivity of 93 and 60 for CO 2 /N 2 and CO 2 /H 2 respectively, in case of ternary gas mixtures (CO 2 /N 2 /H 2 ) at the similar operating conditions. The appreciable CO 2 separation performance tunable with temperature and moisture, displayed unprecedented stability for 30 days.

中文翻译：

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含有丝素蛋白作为促进 CO 2 运输的绿色载体的湿气响应和 CO 2 选择性生物聚合物膜

摘要 在这个能源和环境危机的时代，通过聚合物膜分离二氧化碳（CO 2 ）技术的研究十分活跃。但是，在不牺牲稳定性的情况下追求具有高选择性和通量的膜仍然是一个挑战。我们报告了一种通过合理混合两种生物聚合物制备的新型膜：充当基质的壳聚糖 (CS) 和帮助壳聚糖作为促进运输载体的丝素蛋白 (SF)。二元气体混合物 (CO 2 /N 2 ) 的分离已在温度、进料绝对压力和吹扫水流速范围分别为 60 至 120 °C、2 至 5.93 bar 和 0.01 至 0.07 ml/min 的范围内进行了研究。在 90 °C 和 0 时观察到 140 GPU 的最佳 CO 2 渗透性和二元气体的 CO 2 /N 2 选择性为 103。对于含有 45 wt% SF 与 CS (SF45) 混合的膜，吹扫水流速为 05 ml/min。SF45复合膜的CO 2 渗透率为123 GPU，对CO 2 /N 2 和CO 2 /H 2 的选择性分别为93和60，在类似的三元气体混合物（CO 2 /N 2 /H 2 ）的情况下运行条件。可随温度和湿度调节的显着 CO 2 分离性能，在 30 天内显示出前所未有的稳定性。