Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes
Ultrafast viscous water flow through nanostrand-channelled graphene oxide membranes
复制标题
超快粘性水流穿过纳米链通道氧化石墨烯膜
DOI：
10.1038/ncomms3979
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发表时间：
2013-12-01
影响因子：
16.6
通讯作者：
Peng, Xinsheng
中科院分区：
文献类型：
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作者：
Huang, Hubiao;Song, Zhigong;Peng, Xinsheng
压力驱动超滤膜在分离应用中是重要的。必须开发具有高渗透性和增强截留率的先进过滤膜以满足全球范围内不断增长的需求。在这里，我们报告了纳米链通道氧化石墨烯超滤膜，其具有窄尺寸分布（3-5 nm）和上级分离性能的纳米通道网络。与氧化石墨烯膜相比，这种渗透性提供了10倍的增强而不牺牲截留率，并且比具有类似截留率的商业超滤膜高100倍以上。流动增强归因于多孔结构和显著减小的通道长度。还报道了一种异常的压力依赖性分离行为，其中纳米通道的弹性变形提供了可调的渗透和排斥。通过这些亲水性氧化石墨烯纳米通道的水流被鉴定为粘性的。这种纳米链通道方法也可扩展到其他层压膜，为加速分离和水净化过程提供了潜力。
Pressure-driven ultrafiltration membranes are important in separation applications. Advanced filtration membranes with high permeance and enhanced rejection must be developed to meet rising worldwide demand. Here we report nanostrand-channelled graphene oxide ultrafiltration membranes with a network of nanochannels with a narrow size distribution (3–5 nm) and superior separation performance. This permeance offers a 10-fold enhancement without sacrificing the rejection rate compared with that of graphene oxide membranes, and is more than 100 times higher than that of commercial ultrafiltration membranes with similar rejection. The flow enhancement is attributed to the porous structure and significantly reduced channel length. An abnormal pressure-dependent separation behaviour is also reported, where the elastic deformation of nanochannels offers tunable permeation and rejection. The water flow through these hydrophilic graphene oxide nanochannels is identified as viscous. This nanostrand-channelling approach is also extendable to other laminate membranes, providing potential for accelerating separation and water-purification processes.