High permeability sub-nanometre sieve composite MoS2 membranes
High permeability sub-nanometre sieve composite MoS2 membranes
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DOI：
10.1038/s41467-020-16577-y
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发表时间：
2020-06-02
影响因子：
16.6
通讯作者：
Wanunu, Meni
中科院分区：
文献类型：
--
作者：
Sapkota, Bedanga;Liang, Wentao;Wanunu, Meni
二维膜因其具有对物种进行精确过滤的潜力而引起了极大的兴趣，其性能可以挑战当前的海水淡化膜平台。二硫化钼 (MoS2) 层状膜最近在水环境中表现出优于其广泛研究的类似物石墨烯基膜的稳定性；然而，诸如高盐度水离子排斥率低、水通量低以及随时间推移稳定性低等挑战阻碍了其作为可行技术的潜在采用。在这里，我们报道了具有堆叠异维一层至两层厚度的多孔纳米片和纳米盘的复合层压多层MoS2膜。这些膜具有多峰多孔网络结构，表面电荷、孔径和层间距可调。在正向渗透中，我们的膜可阻挡 99% 以上的高盐度盐，而在反渗透中，小分子有机染料和盐可被有效过滤。最后，我们的膜可以稳定运行一个多月，这意味着它们在商业水净化应用中的潜力。
Two-dimensional membranes have gained enormous interest due to their potential to deliver precision filtration of species with performance that can challenge current desalination membrane platforms. Molybdenum disulfide (MoS2) laminar membranes have recently demonstrated superior stability in aqueous environment to their extensively-studied analogs graphene-based membranes; however, challenges such as low ion rejection for high salinity water, low water flux, and low stability over time delay their potential adoption as a viable technology. Here, we report composite laminate multilayer MoS2 membranes with stacked heterodimensional one- to two-layer-thick porous nanosheets and nanodisks. These membranes have a multimodal porous network structure with tunable surface charge, pore size, and interlayer spacing. In forward osmosis, our membranes reject more than 99% of salts at high salinities and, in reverse osmosis, small-molecule organic dyes and salts are efficiently filtered. Finally, our membranes stably operate for over a month, implying their potential for use in commercial water purification applications.