Tuning Water Nanofiltration Performance of Few-Layered, Reduced Graphene Oxide Membranes by Oxygen Plasma
Tuning Water Nanofiltration Performance of Few-Layered, Reduced Graphene Oxide Membranes by Oxygen Plasma
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DOI：
10.1021/acs.iecr.8b02206
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发表时间：
2018-06
影响因子：
4.2
通讯作者：
Weiwei L. Xu;Fanglei Zhou;Miao Yu
中科院分区：
文献类型：
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作者：
Weiwei L. Xu;Fanglei Zhou;Miao Yu
超薄氧化石墨烯（GO）膜在水纳滤应用中显示出巨大的潜力。然而，由于难以控制氧化石墨烯上的固有含氧官能团和氧化石墨烯夹层在水溶液中的膨胀，因此通过调节氧化石墨烯膜的亲水性和层间纳米通道尺寸来调节氧化石墨烯膜的纳滤性能是一项极具挑战性的工作。在这项研究中，氧等离子体被认为是一种有效的技术，可以通过改善还原氧化石墨烯膜的亲水性和/或调节有效渗透纳米通道/孔大小来调节少层还原氧化石墨烯膜的纳滤性能。通过逐层沉积法制备了5 nm厚的氧化石墨烯膜，并在220°C真空下还原。在5 bar压降下，未检测到透水性（<1.0 L/(m2·h·bar)），表明氧化石墨烯膜质量高，可能具有非常小的疏水纳米通道/孔。接触氧等离子体…
Ultrathin, graphene oxide (GO) membranes have shown great potential for water nanofiltration applications. However, due to the difficulties in controlling the intrinsic oxygen-containing functional groups on GO and the swelling of GO interlayers in aqueous solution, it is highly challenging to tune GO membranes’ nanofiltration performance by adjusting their hydrophilicity and interlayer nanochannel size. In this study, oxygen plasma was reported as an effective technique to tune water nanofiltration performance of few-layered, reduced graphene oxide (rGO) membranes, by improving rGO membranes’ hydrophilicity and/or adjusting effective permeation nanochannel/pore sizes. The 5 nm thick GO membranes were fabricated through a layer-by-layer deposition method and subsequently reduced at 220 °C under vacuum. No detectable water permeance (<1.0 L/(m2·h·bar)) under 5 bar pressure drop suggests the high quality of the rGO membranes possibly with very small hydrophobic nanochannels/pores. Exposure to oxygen plasma ...