Hybrid 2D WS2/GO nanofiltration membranes for finely molecular sieving

Hybrid WS 2 /GO two-dimensional membranes were developed to achieve finely molecular sieving. The size of nanochannels in WS 2 membrane became smaller and more regular after the introduction of GO nanosheets into WS 2 membrane according to XRD and separation results. The hydrated hybrid WS 2 /GO membrane with 15 wt% GO (GO15WS 2 ) exhibited high rejection (>90%) for dyes and ions with a hydrated radius above 4.9 Å. A water permeance of 159.6 L/m 2 ·h·bar and a Methylene Blue (MnB) rejection of 96.3% were achieved through hydrated hybrid GO15WS 2 membrane, which was excellent compared with reported two-dimensional membranes based on TMDs . Moreover, the nanochannels in GO15WS 2 membrane also presented strong rigidity under a pressure loading up to 0.5 MPa. In addition, the half-dried GO15WS 2 membrane possessed high tolerance to shear stress, and the separation performance changed slightly during a 120 h-cross-flow filtration, which made the hybrid GO15WS 2 membrane promising in water filtration .