Morelos-Gomez Aaron, Cruz-Silva Rodolfo, Muramatsu Hiroyuki, Ortiz-Medina Josue, Araki Takumi, Fukuyo Tomoyuki, Tejima Syogo, Takeuchi Kenji, Hayashi Takuya, Terrones Mauricio, Endo Morinobu
Global Aqua Innovation Center, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan.
Institute of Carbon Science and Technology, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan.
Nat Nanotechnol. 2017 Nov;12(11):1083-1088. doi: 10.1038/nnano.2017.160. Epub 2017 Aug 28.
Carbon nanomaterials are robust and possess fascinating properties useful for separation technology applications, but their scalability and high salt rejection when in a strong cross flow for long periods of time remain challenging. Here, we present a graphene-based membrane that is prepared using a simple and environmentally friendly method by spray coating an aqueous dispersion of graphene oxide/few-layered graphene/deoxycholate. The membranes were robust enough to withstand strong cross-flow shear for a prolonged period (120 h) while maintaining NaCl rejection near 85% and 96% for an anionic dye. Experimental results and molecular dynamic simulations revealed that the presence of deoxycholate enhances NaCl rejection in these graphene-based membranes. In addition, these novel hybrid-layered membranes exhibit better chlorine resistance than pure graphene oxide membranes. The desalination performance and aggressive shear and chlorine resistance of these scalable graphene-based membranes are promising for use in practical water separation applications.
碳纳米材料坚固耐用，具有一些对分离技术应用有用的迷人特性，但它们的可扩展性以及在长时间强错流情况下的高脱盐率仍然具有挑战性。在此，我们展示了一种基于石墨烯的膜，它是通过一种简单且环保的方法制备的，即喷涂氧化石墨烯/少层石墨烯/脱氧胆酸盐的水分散体。这些膜足够坚固，能够在长时间（120小时）内承受强错流剪切，同时对氯化钠的截留率保持在85%左右，对一种阴离子染料的截留率保持在96%。实验结果和分子动力学模拟表明，脱氧胆酸盐的存在提高了这些基于石墨烯的膜对氯化钠的截留率。此外，这些新型混合层膜比纯氧化石墨烯膜表现出更好的耐氯性。这些可扩展的基于石墨烯的膜的脱盐性能以及对强剪切和氯的耐受性，有望用于实际的水分离应用。
