Stabilizing MXene-based nanofiltration membrane by forming analogous semi-interpenetrating network architecture using flexible poly(acrylic acid) for effective wastewater treatment
Stabilizing MXene-based nanofiltration membrane by forming analogous semi-interpenetrating network architecture using flexible poly(acrylic acid) for effective wastewater treatment
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通过使用柔性聚丙烯酸形成类似的半互穿网络结构来稳定基于 MXene 的纳滤膜，以实现有效的废水处理
DOI：
10.1016/j.memsci.2022.120360
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发表时间：
2022-02
影响因子：
9.5
通讯作者：
Lingdi Shen
中科院分区：
文献类型：
--
作者：
Yuting Zhang;Suhong Li;Rong Huang;Jing He;Yufei Sun;Yanyan Qin;Lingdi Shen
二维MXene(Ti3C2Tx)膜在水处理领域引起了广泛的兴趣，以缓解清洁用水短缺的问题。然而，由于相邻的MXene层压板之间的弱相互作用，MXene基膜在水中浸泡时的膨胀和随后的不稳定性问题阻碍了其广泛应用。在此，提出了一种可行的策略来稳定和调节MXene基膜的纳米通道，并获得优异的纳滤效率。首先将聚丙烯酸(PAA)大分子插入MXene纳米片层中，形成PAA改性MXene(PAA-MXene)分散体。然后，将分散体真空过滤在电纺聚丙烯腈(PAN)纳米纤维基材上，形成超薄的PAA-MXene水凝胶阻隔层，从而组装成PAA-MXene/PAN复合膜。Mxene层状结构将被柔性的聚酰胺大分子长链缠绕在一起，通过强的氢键相互作用形成以Mxene为物理交联剂的同源半互穿网络结构，这将限制Mxene纳米片的明显结构变化，并在Mxene：PAA质量比为1：0.5时有效地调整∼14.28时的d间距。PAA和MXene纳米片以及电纺PAN纳米纤维基板的协同作用使PAA-MXene/PAN膜对各种染料具有优异的纳滤性能。优化的PAA-Mxene/PAN膜对−2 h−1的渗透通量分别为271.26、516.34、300.83 mg/L，对DR80、AB8GX、AB90的截留率分别为98.92%、99.52%、98.12%，明显优于文献报道的MXen基膜。此外，PAA-MXene/PAN膜具有良好的长期耐久性，更适合于低压纳滤。这些都使PAA-MXene/PAN膜成为一种很有前途的废水处理纳滤膜。
Two-dimension MXene (Ti3C2Tx) membrane has attracted widespread interest in water treatment to relieve the problem of clean water shortage. Nevertheless, notorious swelling and subsequent instability problems of the MXene-based membrane when immersing in water hinder its wide application, owing to the weak interaction between the adjacent MXene laminates. Herein, a feasible strategy is proposed to stabilize and tune the nanochannels of MXene-based membranes and achieve superior nanofiltration efficiency. Poly(acrylic acid) (PAA) macromolecules are firstly inserted into the MXene nanosheets and form PAA-modified MXene (PAA-MXene) dispersion. Then, the dispersion is vacuum filtered on the electrospun polyacrylonitrile (PAN) nanofibrous substrate to form an ultra-thin PAA-MXene hydrogel barrier layer, thus assembling into PAA-MXene/PAN composite membrane. The MXene laminates will be intertwined by the long chain of flexible PAA macromolecules and thus form homologous semi-interpenetrating network structure with MXene as physical crosslinker through strong hydrogen-bond interaction, which will restrict the obvious structural change of MXene nanosheets and effectively adjust their d-spacing at ∼14.28 Å with MXene: PAA mass ratio of 1:0.5. The synergic effect of PAA and MXene nanosheets, as well as electrospun PAN nanofibrous substrate, endows the PAA-MXene/PAN membrane with superior nanofiltration performance to various dyes. The optimum PAA-MXene/PAN membrane possesses permeate fluxes of 271.26, 516.34, 300.83 L m−2h−1and rejections of 98.92%, 99.52%, 98.12% to DR80, AB8GX and AB90 at 0.1 MPa, respectively, which exhibit distinct advantage than the MXene-based membrane in literature. In addition, the PAA-MXene/PAN membrane has good long-time durability and is more suitable for low pressure nanofiltration. All these make PAA-MXene/PAN membrane a promising nanofiltration membrane for wastewater treatment.
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