Electric field modulated water permeation through laminar Ti3C2Tx MXene membrane
Electric field modulated water permeation through laminar Ti3C2Tx MXene membrane
复制标题
通过层状 Ti3C2TX MXene 膜的电场调制水渗透
DOI：
10.1016/j.watres.2022.118598
复制
发表时间：
2022-05-18
期刊：
影响因子：
12.8
通讯作者：
Jiang, Lei
中科院分区：
文献类型：
--
作者：
Zhang, Li;Kan, Xiaonan;Jiang, Lei
控制水运是一系列与水有关的能源和环境问题的核心。特别是，在实际的膜应用中，如水处理，高度要求提高水的渗透性。在这项工作中，我们证明了水通过层流和导电的MXene膜可以很容易地通过电场调节。通过在膜上施加几伏的负电压，水的渗透速率提高了70倍。密度泛函理论计算和实验表征表明，电场作用下MXene纳米片的亲水性增强是由水/ MXene相互作用增强引起的。在促进水渗透的同时，膜对染料的去除率保持在较高的水平，在-3 V的电压下，对刚果红和苯胺蓝的去除率分别为93.1%和94.8%，显示出染料分离和水净化的潜力。考虑到利用MXene进行分离和水处理的兴趣越来越大，这项工作应该激发相关领域的一系列未来工作，以改善外部刺激下的膜性能。
Controlling water transport is central to a wide range of water-related energy and environment issues. In particular, enhancing the water permeation is highly demanded for practical membrane applications such as water treatment. In this work, we demonstrate that the water permeation through the laminar and electrically conductive MXene membrane can be facilely modulated with electric field. By applying a negative voltage of a few volts on the membrane, the water permeation rate was enhanced by 70 times. Density functional theory calculations and experimental characterizations suggest that the enhancement arises from the enhanced water/ MXene interaction under electric field, which manifests itself as enhanced hydrophilicity of the MXene nanosheets. Along with the facilitated water permeation, the rejection rate to dyes of the membrane was kept at a relatively high level, which was 93.1% to Congo red and 94.8% to aniline blue under an applied voltage of -3 V, showing the potential for dye separation and water purification. Considering that there has been increasing interest in utilizing MXene for separations and water treatment, this work should inspire a range of future works in the related area to improve the membrane performance with external stimuli.