(399p) Nanoporous Crystals Channeled Two-Dimensional-Material Membranes with Highly-Enhanced Water Purification Performance
AIChE Annual Meeting
2017
2017 Annual Meeting
Separations Division
Poster Session: General Topics on Separations
Tuesday, October 31, 2017 - 3:15pm to 4:45pm
In this work, we report nanoporous crystals embedded graphene laminate membranes for water purification. Reduced graphene oxide (rGO) nanosheets obtained from a solution-chemical process act as building blocks to construct the 2D channels through a pressure-driven filtration process. By incorporating the 3D nanoporous crystals with sub-nano sized aperture size (e.g., UiO-66, Prussian blue) into the 2D graphene laminates, both the inter-layer spacing and numbers of nanofluidic channels are increased, leading to a highly-enhanced water transport property. The optimized 3D/2D membranes exhibit 15 times higher water permeability (30 L m-2 h-1 bar-1) than that of the rGO membrane with similar high dye rejection rate (>95% for rhodamine B). The significance of such 3D nanoporous structure and transport mechanism through the 3D/2D membranes are systematically studied. This general approach of enhancing the molecular transport through 2D nanofluidic channels proposed here may also find application in gas separation and battery membranes.
Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Nos. 21490580, 21476107, 21406107).