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Regulating the Interlayer Spacing of Graphene Oxide Membranes and Enhancing their Stability by Use of PACl
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-10-03 , DOI: 10.1021/acs.est.9b04418 Ting Liu 1, 2 , Long Tian 1 , Nigel Graham 2 , Bing Yang 1 , Wenzheng Yu 2, 3 , Kening Sun 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-10-03 , DOI: 10.1021/acs.est.9b04418 Ting Liu 1, 2 , Long Tian 1 , Nigel Graham 2 , Bing Yang 1 , Wenzheng Yu 2, 3 , Kening Sun 1
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Graphene oxide (GO) is an ideal membrane material for water treatment due to its outstanding physicochemical properties and unique lamellar structure. However, the separation performance and practical application of GO membranes are mainly affected by the interlayer spacing and stability in aqueous solutions. Here, we report a novel and facile approach to fabricating GO membranes with adjustable interlayer spacing and high stability in aqueous solutions through cross-linking with polyaluminum chloride (PACl). With this approach, the lamellar spacing can be adjusted by changing the OH/Al ratios (B values) of the PACl, and the GO nanosheets can be tightly bonded by the strong electrostatic effect that PACl provides between them. The average interlayer spacing of the GO layer could be varied approximately in the range of 0.80–1.09 nm. The PACl–GO membranes demonstrated excellent stability in water and inorganic/organic solutions when the concentration of PACl was 0.1, 1, and 10 mM, remaining unchanged for at least 2 weeks. Moreover, the PACl–GO membranes featured exceptional sieving capabilities for model and natural organic substrates, while it was also observed that increasing the interlayer spacing of the PACl–GO membranes increased both the membrane flux and the separation performance of organic matter.
中文翻译：
通过使用PACl调节氧化石墨烯膜的层间距并增强其稳定性
氧化石墨烯（GO）具有出色的理化特性和独特的层状结构，是用于水处理的理想膜材料。然而，GO膜的分离性能和实际应用主要受水溶液中层间间距和稳定性的影响。在这里，我们报告了一种新颖且简便的方法，可通过与聚氯化铝（PACl）交联来制备具有可调的层间距和在水溶液中具有高稳定性的GO膜。通过这种方法，可以通过改变OH / Al的比例来调整层状间距（B值）和GO纳米片可以通过PACl在它们之间提供的强静电效应紧密地结合在一起。GO层的平均层间距可以在0.80–1.09 nm的范围内变化。当PACl的浓度为0.1、1和10 mM时，PACl-GO膜在水和无机/有机溶液中表现出出色的稳定性，至少保持2周不变。此外，PACl-GO膜对模型和天然有机基质具有出色的筛分能力，同时还观察到，增加PACl-GO膜的层间间距可提高膜通量和有机物的分离性能。
更新日期：2019-10-03
中文翻译：
通过使用PACl调节氧化石墨烯膜的层间距并增强其稳定性
氧化石墨烯（GO）具有出色的理化特性和独特的层状结构，是用于水处理的理想膜材料。然而，GO膜的分离性能和实际应用主要受水溶液中层间间距和稳定性的影响。在这里，我们报告了一种新颖且简便的方法，可通过与聚氯化铝（PACl）交联来制备具有可调的层间距和在水溶液中具有高稳定性的GO膜。通过这种方法，可以通过改变OH / Al的比例来调整层状间距（B值）和GO纳米片可以通过PACl在它们之间提供的强静电效应紧密地结合在一起。GO层的平均层间距可以在0.80–1.09 nm的范围内变化。当PACl的浓度为0.1、1和10 mM时，PACl-GO膜在水和无机/有机溶液中表现出出色的稳定性，至少保持2周不变。此外，PACl-GO膜对模型和天然有机基质具有出色的筛分能力，同时还观察到，增加PACl-GO膜的层间间距可提高膜通量和有机物的分离性能。
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