Highly Stable and Antibacterial Two-Dimensional Tungsten Disulfide Lamellar Membrane for Water Filtration.

Two-dimensional (2D) lamellar membranes consisting of restacked WS nanosheets have shown excellent separation properties for water filtration. The stability, antifouling properties, and antibacterial activities of the WS laminar membranes were investigated for practical application. We discovered that the separation properties of the WS laminar membranes changed slightly after soaking in water for 28 days as well as that of a 45 h-cross-flow filtration, demonstrating an extraordinary operational stability of the WS laminar membranes. The remarkable stability is related to the dominant van der Waals interactions between WS nanosheets. In addition, the WS laminar membranes exhibited excellent antibacterial properties against S. aureus and E. coli with antibacterial rates of 91.3 % and 89.7 %, respectively. These properties of the WS laminar membranes make them promising candidates for application in water filtration.