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Selective Permeation of Water through Angstrom-Channel Graphene Membranes for Bioethanol Concentration.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-07-08 , DOI: 10.1002/adma.202002320 Xiaofang Chen 1 , Shabin Mohammed 1 , Guang Yang 2 , Tianyue Qian 1 , Yu Chen 3 , Hongyu Ma 1 , Zongli Xie 2 , Xiwang Zhang 1 , George P Simon 1 , Huanting Wang 1
Advanced Materials ( IF 27.4 ) Pub Date : 2020-07-08 , DOI: 10.1002/adma.202002320 Xiaofang Chen 1 , Shabin Mohammed 1 , Guang Yang 2 , Tianyue Qian 1 , Yu Chen 3 , Hongyu Ma 1 , Zongli Xie 2 , Xiwang Zhang 1 , George P Simon 1 , Huanting Wang 1
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Graphene‐based laminate membranes have been theoretically predicted to selectively transport ethanol from ethanol–water solution while blocking water. Here, robust angstrom‐channel graphene membranes (ACGMs) fabricated by intercalating carbon sheets derived from chitosan into thermally reduced graphene oxide (GO) sheets are reported. ACGMs with robust and continuous slit‐shaped pores (an average pore size of 3.9 Å) are investigated for the dehydration of ethanol. Surprisingly, only water permeates through ACGMs in the presence of aqueous ethanol solution. For the water‐ethanol mixture containing 90 wt% ethanol, water can selectively permeate through ACGMs with a water flux of 63.8 ± 3.2 kg m−2 h−1 at 20 °C and 389.1 ± 19.4 kg m−2 h−1 at 60 °C, which are over two orders of magnitude higher than those of conventional pervaporation membranes. This means that ACGMs can effectively operate at room temperature. Moreover, the ethanol can be fast concentrated to high purity (up to 99.9 wt%). Therefore, ACGMs are very promising for production of bioethanol with high efficiency, thus improving its process sustainability.
中文翻译：
水通过埃通道石墨烯膜的选择性渗透，可用于生物乙醇浓缩。
从理论上讲，基于石墨烯的层压膜可选择性地从乙醇水溶液中转运乙醇，同时阻滞水。在这里，报道了通过将壳聚糖衍生的碳片插入热还原的氧化石墨烯（GO）片而制成的坚固的埃通道石墨烯膜（ACGM）。研究了具有健壮和连续的狭缝形孔（平均孔径为3.9Å）的ACGM对乙醇的脱水作用。令人惊讶的是，在乙醇水溶液的存在下，只有水透过ACGMs渗透。对于含有90水-乙醇混合物重量％的乙醇，水可以选择性地通过ACGMs渗透用的水通量63.8±3.2公斤米-2 ħ -1在20℃和389.1±19.4公斤米-2 ħ -1温度为60°C，比传统的全蒸发膜高出两个数量级。这意味着ACGM可以在室温下有效运行。此外，乙醇可以快速浓缩至高纯度（最高99.9 wt％）。因此，ACGMs对于高效生产生物乙醇非常有希望，从而提高其工艺的可持续性。
更新日期：2020-08-18
中文翻译：
水通过埃通道石墨烯膜的选择性渗透，可用于生物乙醇浓缩。
从理论上讲，基于石墨烯的层压膜可选择性地从乙醇水溶液中转运乙醇，同时阻滞水。在这里，报道了通过将壳聚糖衍生的碳片插入热还原的氧化石墨烯（GO）片而制成的坚固的埃通道石墨烯膜（ACGM）。研究了具有健壮和连续的狭缝形孔（平均孔径为3.9Å）的ACGM对乙醇的脱水作用。令人惊讶的是，在乙醇水溶液的存在下，只有水透过ACGMs渗透。对于含有90水-乙醇混合物重量％的乙醇，水可以选择性地通过ACGMs渗透用的水通量63.8±3.2公斤米-2 ħ -1在20℃和389.1±19.4公斤米-2 ħ -1温度为60°C，比传统的全蒸发膜高出两个数量级。这意味着ACGM可以在室温下有效运行。此外，乙醇可以快速浓缩至高纯度（最高99.9 wt％）。因此，ACGMs对于高效生产生物乙醇非常有希望，从而提高其工艺的可持续性。
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