Laminar MoS2 membranes for molecule separation

Abstract

For the first time, a laminar separation membrane was assembled from atom-thick MoS2 sheets and exhibited a water permeance of 245 L h(-1) m(-2) bar(-1), which was 3-5 times higher than that of graphene oxide membranes without degradation of the rejection ratio (89%) for Evans blue molecules.

Design and function of biomimetic multilayer water purification membranes

“…Remarkably, fluxes of 0.3-μm-thick SNF/HAP membranes are up to 8355 liter hour −1 m −2 bar −1 , more than 1000 times higher than those of commercial filtration membranes ( 41 – 43 ) and more than 4 times higher than those of most advanced, recently reported ultrathin membranes with similar thicknesses (Fig. 4E) ( 4 , 5 , 9 – 11 , 18 , 20 , 21 ). In addition, the flux of the SNF/HAP membranes is stable in a 24-hour filtration assessment (Fig.…”

“…Layer-by-layer assembly is one method of building multilayer structures ( 34 – 36 ), but this approach comes with several drawbacks, such as limited material selectivity, a time-consuming and tedious process, and the relatively weak mechanical properties of the resultant membranes. Recently, a variety of laminar inorganic nanosheets, such as graphene oxide ( 16 – 19 ), molybdenum disulfide ( 20 ), and tungsten disulfide ( 21 ), have been used to build layered purification membranes. However, without complex and expensive processing, these membranes will not have nanosized porous structures.…”

Ultrathin membranes of single-layered MoS2nanosheets for high-permeance hydrogen separation

“…Among them, the H 2 permeance approaching 28000 GPUs with H 2 /CO 2 selectivity larger than 3 is achieved by 17-nm-thick The single-layered MoS 2 was prepared by chemical exfoliating bulk MoS 2 flakes with the aid of alkyl lithium as intercalator (see Supporting Information for detail). 18,19 Through this process, MoS 2 nanosheets in a large scale mass could be obtained. Figure 1a shows an aqueous dispersion of as-prepared MoS 2 nanosheets in ca.…”

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

“…The restacked TMD laminar membranes with more rigid nanochannels could withstand higher pressure loading with less compaction and more stable performance . Most importantly, the TMD laminar membranes showed excellent stability in aqueous solution owing to the dominant van der Waals interactions between the TMD nanosheets …”

“…For example, high water permeances of 245 and 450 L m −2 h −1 bar −1 were achieved through MoS 2 and WS 2 laminar membranes with 89 % and 93 % rejection of EB, respectively. The water permeances were 3–7 times higher than that of pristine GO membranes . Additionally, the layered MoS 2 membranes were also utilized to separate organic vapors and ions .…”