Two-dimensional (2D) lamellar membranes with fast molecular transfer and precise sieving hold great promise for a wide range of separation applications. However, existing transfer channels are horizontally arrayed with long and tortuous in-plane paths, leading to high flow resistance and hence limited molecular permeance. Herein, we report a loosely stacked lamellar membrane with fastigiated channels using rigid and irregular molybdenum disulfide (MoS2) flakes as building blocks. Through filtration, MoS2 flakes stack in a disordered manner and construct hierarchical transfer channels: narrow gaps (∼1.8 nm) at the contacting edges of flakes and large cavities (∼8.3 nm) among stacked flakes. The large cavities work as low-barrier channels and result in ultrafast molecular permeation: over 1430 and 5000 L m−2 h−1 bar−1 for water and organics, respectively. However, the narrow gaps afford excellent dye rejection: over 90% for dyes with a size of above 1.9 nm. Dynamic simulation demonstrates that the flow resistance of fastigiated channels is much lower than that of horizontal channels. Furthermore, the corresponding model equation is established for describing molecular transfer in such channels. In addition, the membrane exhibits adequate structural stability under ultrasonication and acid or alkali environments, guaranteeing potential for long-term operation.
Solar-driven interfacial water evaporation shows great potential to address the global water crisis, but its efficient implementation in the presence of organic wastewater remains challenging. Here, we achieved integrated water evaporation and organic compound degradation by designing a multifunctional MoS 2 membrane. Under 1.0 sun irradiation, the membrane exhibits an evaporation rate of 2.07 kg m −2 h −1 and 82% degradation efficiency of organic pollutants, with negligible organic pollutant residues in the condensate. The high performance is attributed to the thermal energy generated by the evaporation process of MoS 2 membrane. This promotes an increase in the rate constant of interfacial electron transfer during the photocatalytic reaction, accelerating the generation of free radicals and facilitating the removal of organic pollutants. The study demonstrated that fresh water can be collected from high-salinity wastewater at a rate of 1.56 kg m −2 h −1 . The MoS 2 membrane provides a sustainable approach to addressing the water crisis.
危险品化学品经营许可证（带存储）