MXene nanosheet stacks with tunable nanochannels for efficient molecular separation
MXene nanosheet stacks with tunable nanochannels for efficient molecular separation
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MXene 纳米片堆叠与可调纳米通道可实现高效分子分离
DOI：
10.1016/j.cej.2021.132070
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发表时间：
2021-08-31
影响因子：
15.1
通讯作者：
Lin, Jiuyang
中科院分区：
文献类型：
--
作者：
Li, Jian;Li, Lei;Lin, Jiuyang
薄膜纳米复合（TFN）膜由嵌入纳米填料的聚酰胺层和多孔基底组成，被认为是实现多功能性、性能增强和可控分离过程的有前途的候选材料。与传统的界面聚合合成工艺不同，本研究尝试在膜表面使用MXene纳米片作为纳米填料，同时将界面聚合形成的聚酰胺用作插层试剂和稳定剂。带正电的聚乙烯亚胺（PEI）和带负电的MXene纳米片保证了良好的相容性，最终使所得膜对不同染料具有高截留率。用0.1毫克PEI和0.15毫克MXene修饰的最佳膜具有20.9 LMH/bar的纯水渗透率，对刚果红、活性蓝19和甲基蓝的染料截留率分别为99.42%、99.02%和98.84%。同时，该膜对硫酸钠和氯化钠表现出显著的截留率（分别为65.7%和23.9%）。基于MXene的膜性能增强主要是由于层间距增大和适当的交联度，这同时增加了水的传输并保持了截留率。总体而言，这项工作表明，使用MXene纳米片构建高性能纳滤膜是处理染料废水的一个成功选择。
Thin film nanocomposite (TFN) membrane, which consists of nanofiller embedded polyamide layer and a porous substrate, have been deemed as a promising candidate to achieve multifunctionality, property enhancement and controllable separation process. Being different from traditional interfacial polymerization synthesis process, this work attempts to use MXene nanosheets as nanofillers on membranes surface while polyamide constructed by interfacial polymerization is served as intercalate reagent and stabilizer. The positively charged polyethyleneimine (PEI) and negatively charged MXene nanosheets guaranteed a favorable compatibility, which finally endowed the obtained membranes with high rejection toward different dyes. The optimal membrane decorated by 0.1 mg PEI and 0.15 mg MXene possesses a pure water permeability of 20.9 LMH bar(-1) and dyes rejection of 99.42%, 99.02% and 98.84% for Congo red, Reactive blue 19 and Methyl blue, respectively. Meantime, the membrane exhibited impressive rejections towards Na2SO4 and NaCl (65.7% and 23.9%). The enhanced performance of the MXene-based membrane is mainly due to the amplified interlayer distance and the appropriate crosslinking degree, which increases the water transport and retain the rejection simultaneously. Overall, this work suggests that the employment of MXene nanosheets for the construction of high-performance nanofiltration membranes can be a successful choice to treat dye wastewater.