Chong J Y, Wang B, Li K
Barrer Centre, Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.
Chem Commun (Camb). 2018 Mar 6;54(20):2554-2557. doi: 10.1039/c7cc09120f.
Graphene oxide (GO) membranes have shown excellent selectivities in nanofiltration and pervaporation. However, the water transport mechanisms in the unique membrane laminar structure are still not well understood, especially in pervaporation which involves selective permeation and evaporation. Herein, water transport in GO membranes was tested under two different modes: pressure-driven permeation and pervaporation. The pure water flux was found to be 1-2 orders of magnitude higher in pervaporation due to the large capillary pressure induced by evaporation. The water flux in pervaporation was suggested to be limited by evaporation at room temperature but surface diffusion at high temperature.
氧化石墨烯（GO）膜在纳滤和渗透汽化方面表现出优异的选择性。然而，独特的膜层状结构中的水传输机制仍未得到很好的理解，尤其是在涉及选择性渗透和蒸发的渗透汽化过程中。在此，对GO膜在两种不同模式下的水传输进行了测试：压力驱动渗透和渗透汽化。由于蒸发引起的大毛细管压力，发现渗透汽化中的纯水通量要高1 - 2个数量级。渗透汽化中的水通量在室温下被认为受蒸发限制，而在高温下受表面扩散限制。
