微氧化MXene/MoS_(2)复合膜分离净化效能及稳定性增强机制研究

Micro-Oxidized MXene/MoS_(2)Composite Membrane with Superior Stability for Efficient Water Purification

二维纳米材料由于优异的理化性质和易于调控的特点,在新型膜材料的开发与应用中受到了广泛关注.基于二维材料层层堆叠可以制备二维膜,而如何对二维膜进行结构性能上的改进是目前该领域聚焦的前沿问题.MXene膜是一种新型二维膜,在分离净化领域具有较大应用潜力.然而,目前MXene膜的分离净化效能主要受到膜的结构稳定性和改性方法的限制.本研究采用了通过异质纳米材料MoS_(2)插层,随后进行温和且快速预氧化,可获得稳定的纳米层状结构,从而得到一种MXene(Ti_(3)C_(2)Tx)/MoS_(2)高性能复合膜.MXene/MoS_(2)复合膜的水通量显著提高,对目标污染物染料的去除率高达99.9%.与未氧化的MXene膜相比,复合膜对NaCl和MgCl_(2)的渗透抑制效率分别提高了48.4%和82.0%.此外,复合膜在结构/外观和通量方面表现出长期的稳定性.因此,利用预氧化/插层法制备的复合膜对MXene膜结构调控和性能优化提供了新策略和新思路.

2D nano-materials have attracted extensive attention in the development and application of membrane materials due to their excellent physical and chemical properties and easy regulation.2D membranes can be pre-pared by layer-by-layer stacking of 2D materials.However,how to modify the structure and properties of nano-sheets is a frontier research issue in this field.In this study,a high performance composite membrane based on MXene(Ti_(3)C_(2)Tx)/MoS_(2)was prepared by a mild and rapid pre-oxidation method.The test results show that the water permeability of the composite membrane can be improved greatly.The rejection rate of the targeted dye can reach as high as 99.9%.Compared with the un-oxidized MXene membrane,the improved composite mem-brane can make the osmotic inhibition efficiency to NaCl and MgCl_(2)increased by 48.4%and 82.0%separately.In addition,the composite membrane can also show long term stability in water in terms of both structure/appear-ance and flux,providing actually a new strategy and idea of MXene(Ti_(3)C_(2)Tx)for MXene membrane structure regulation and performance optimization.