Enhanced Performance of a Novel Polyvinyl Amine/Chitosan/Graphene Oxide Mixed Matrix Membrane for CO2 Capture

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• 作者：Yijia Shen ; Huixian Wang ; Jindun Liu ; Yatao Zhang
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2015
• 出版时间：August 3, 2015
• 年：2015
• 卷：3
• 期：8
• 页码：1819-1829
• 全文大小：627K
• ISSN：2168-0485

文摘

In this study, a facilitated transport mixed matrix membrane was fabricated by a surface coating method. Polyvinyl amine (PVAm) and chitosan (Cs) were used as the polymer matrix materials and coated onto a porous polysulfone (PS) support. Graphene oxide (GO) grafted with hyperbranched polyethylenimine (HPEI-GO) was added as the nanofiller. The gas separation tests with CO₂/N₂ (10:90 v:v) mixed gas suggest that the addition of GO could improve CO₂/N₂ selectivity. The highest CO₂ permeance was 36 GPU in the membrane with 2.0 wt % HPEI-GO, and the optimal selectivity was 107 in the membrane with 3.0 wt % HPEI-GO. Herein, GO could provide a transport channel for CO₂ and enhance the long-term stability of the membranes. Further gas separation tests under various relative humidities confirmed that facilitated transport was the main mechanism of gas separation through the membrane. The stability test suggests that the membrane has long-term stability. CO₂ transports through the membrane mainly by the facilitated transport mechanism with assistance from the solution-diffusion mechanism, while N₂ transports only by the solution-diffusion mechanism.