Membranes assembled from two‐dimensional (2‐D) layered materials have shown potential use in water purification. Recently, a 2‐D graphitic carbon nitride (g‐C₃N₄) nanosheets membrane exhibits considerable separation performance in water purification. In this study, to further improve this water separation performance, polyacrylic acid (PAA) was introduced to tune the nanochannels formed between the g‐C₃N₄ nanosheets. The fabricated g‐C₃N₄‐PAA hybrid membranes possessed higher water flux without sacrificing much rejection rate compared with that of the g‐C₃N₄ membrane; however, noticeable fouling was observed upon addition of the PAA into the membrane composite structure. In addition, the effect of PAA on the morphology, surface hydrophilicity, separation performance, and antifouling properties of the g‐C₃N₄ membrane were examined in detail. Overall, incorporating PAA into the g‐C₃N₄ nanosheets membrane was an effective and convenient method to improve the water separation performance, which could promote the application of the 2‐D g‐C₃N₄ nanosheets membrane in practical ultrafiltration processes. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2181–2188, 2018

中文翻译：

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通过掺入聚丙烯酸增强通过石墨碳氮化物纳米片膜的水通量

由二维（二维）层状材料组装而成的膜已显示出在水净化中的潜在用途。最近，二维石墨碳氮化碳（g-C ₃ N ₄）纳米片膜在水净化方面表现出可观的分离性能。在这项研究中，为了进一步改善这种水分离性能，引入了聚丙烯酸（PAA）来调节在g-C ₃ N ₄纳米片之间形成的纳米通道。所制造的G-C ₃ Ñ ₄ -PAA杂化膜具有较高的水通量，而不与所述的比较牺牲太多废品率G-C ₃ Ñ ₄膜; 然而，在膜复合结构中加入PAA后，观察到明显的结垢。此外，还详细检查了PAA对g-C ₃ N ₄膜的形态，表面亲水性，分离性能和防污性能的影响。总体而言，将PAA掺入g‐C ₃ N ₄纳米片膜是一种有效且方便的方法，可以提高水分离性能，这可以促进二维g‐C ₃ N ₄纳米片膜在实际超滤过程中的应用。©2018美国化学工程师学会AIChE J，64：2181–2188，2018