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Bioinspired Graphene Oxide Membranes with Dual Transport Mechanisms for Precise Molecular Separation

机译：具有双重传输机制的生物启发氧化石墨烯膜，可进行精确的分子分离

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The implementation of membrane technology to replace or combine with energy-intensive cryogenic distillation for precise separation of ethylene/ethane mixture proves an extremely important yet highly challenging task. Inspired by the hierarchical structure and facilitated gas transport of biological membranes, a highly selective ethylene/ethane separation membrane is explored through the fixation of a silver ion carrier and the impregnation of ionic liquid within 2D nanochannels of graphene oxide laminate, where plenty of ethylene-permeating in-plane nano-wrinkles and ethylene-facilitated plane-to-plane nanochannels are constructed. By virtue of synergistic effects of molecular sieving and carrier-facilitated transport, an unprecedented combination of high ethylene permeance (72.5 GPU) and superhigh ethylene/ethane selectivity (215) is achieved, out-performing currently reported advanced membranes. Moreover, molecular dynamics simulations verify a favorable membrane nanostructure for fast and selective transport of ethylene molecules. This bioinspired approach with dual transport mechanisms may open novel avenues to the design of high-performance membranes for precise molecular separation.
机译：膜技术的替代或与能量密集型低温蒸馏的结合以实现乙烯/乙烷混合物的精确分离已被证明是一项极为重要但极富挑战性的任务。受生物膜的层级结构和促进气体传输的启发，通过固定银离子载体和将离子液体浸渍在氧化石墨烯层压板的二维纳米通道中，探索了高度选择性的乙烯/乙烷分离膜，其中大量乙烯-构建渗透面内纳米皱纹和乙烯促进的面对面纳米通道。由于分子筛和载体促进运输的协同作用，实现了高乙烯渗透率（72.5 GPU）和超高乙烯/乙烷选择性（215）的空前组合，其性能优于目前报道的先进膜。此外，分子动力学模拟证明了有利的膜纳米结构可用于乙烯分子的快速和选择性运输。这种具有双重转运机制的受生物启发的方法可能为高性能膜的设计开辟新途径，以实现精确的分子分离。

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