Oviroh Peter Ozaveshe, Jen Tien-Chien, Ren Jianwei, Mohlala Lesego M, Warmbier Robert, Karimzadeh Sina
Department of Mechanical Engineering Science, University of Johannesburg, Corner Kingsway and University Road, Auckland Park, 2092, Johannesburg, South Africa.
Department of Metallurgical Engineering, University of Johannesburg, Doornfontein, 2006, Johannesburg, South Africa.
Langmuir. 2021 Jun 15;37(23):7127-7137. doi: 10.1021/acs.langmuir.1c00708. Epub 2021 May 28.
Molybdenum disulfide (MoS), a two-dimensional (2D) material, promises better desalination efficiency, benefiting from the small diffusion length. While the monolayer nanoporous MoS membrane has great potential in the reverse osmosis (RO) desalination membrane, multilayer MoS membranes are more feasible to synthesize and economical than the monolayer MoS membrane. Building on the monolayer MoS membrane knowledge, the effects of the multilayer MoS membrane in water desalination were explored, and the results showed that increasing the pore size from 3 to 6 Å resulted in higher permeability but with lower salt rejection. The salt rejection increases from 85% in a monolayer MoS membrane to about 98% in a trilayer MoS membrane. When averaged over all three types of membranes studied, the ions rejection follows the trend of trilayer > bilayer > monolayer. Besides, a narrow layer separation was found to play an important role in the successful rejection of salt ions in bilayer and trilayer membranes. This study aims to provide a collective understanding of this high permiselective MoS membrane's realization for water desalination, and the findings showed that the water permeability of the MoS monolayer membrane was in the order of magnitude greater than that of the conventional RO membrane and the nanoporous MoS membrane can have an important place in the purification of water.
二硫化钼（MoS₂）作为一种二维（2D）材料，由于其较小的扩散长度，有望实现更高的脱盐效率。虽然单层纳米多孔MoS₂膜在反渗透（RO）脱盐膜方面具有巨大潜力，但多层MoS₂膜比单层MoS₂膜更易于合成且成本更低。基于对单层MoS₂膜的了解，研究了多层MoS₂膜在水脱盐中的作用，结果表明，将孔径从3埃增加到6埃会导致更高的渗透率，但盐截留率降低。盐截留率从单层MoS₂膜的85%增加到三层MoS₂膜的约98%。在所研究的所有三种类型的膜中，离子截留率遵循三层>双层>单层的趋势。此外，发现窄层间距在双层和三层膜成功截留盐离子方面起着重要作用。本研究旨在全面了解这种高选择性MoS₂膜在水脱盐中的实现情况，研究结果表明，MoS₂单层膜的水渗透率比传统RO膜高几个数量级，纳米多孔MoS₂膜在水净化方面可占据重要地位。
