Zero-dimensional carbon dots have emerged as important nanofillers for the separation membrane due to their small specific size and rich surface functional groups.This study proposed a strategy based on hydrophobic ca...Zero-dimensional carbon dots have emerged as important nanofillers for the separation membrane due to their small specific size and rich surface functional groups.This study proposed a strategy based on hydrophobic carbon dots(HCDs)to regulate water channels for an efficient forward osmosis(FO)membrane.Thin-film composite(TFC)membranes with superior FO performance are fabricated by introducing HCDs as the nanofiller in the polyacrylonitrile support layer.The introduction of HCDs promotes the formation of the support layer with coherent finger-like hierarchical channels and micro-convex structure and an integrated polyamide active layer.Compared to the original membrane,TFC-FO membrane with 10 wt%HCDs exhibits high water flux(15.47 L m^(-2)h^(-1))and low reverse salt flux(2.9 g m^(-2)h^(-1))using 1 mol/L Na Cl as the draw solution.This improved FO performance is attributed to the lower structural parameters of HCDs-induced water channels and alleviated internal concentration polarization.Thus,this paper provides a feasible strategy to design the membrane structure and boost FO performance.展开更多
基金financially supported by the National Key Research and Development Project(No.2019YFC1907801)the Hunan Provincial Science and Technology Plan Projects(No.2019JJ30031)the Innovation-Driven Project of Central South University(No.2020CX007)。
文摘Zero-dimensional carbon dots have emerged as important nanofillers for the separation membrane due to their small specific size and rich surface functional groups.This study proposed a strategy based on hydrophobic carbon dots(HCDs)to regulate water channels for an efficient forward osmosis(FO)membrane.Thin-film composite(TFC)membranes with superior FO performance are fabricated by introducing HCDs as the nanofiller in the polyacrylonitrile support layer.The introduction of HCDs promotes the formation of the support layer with coherent finger-like hierarchical channels and micro-convex structure and an integrated polyamide active layer.Compared to the original membrane,TFC-FO membrane with 10 wt%HCDs exhibits high water flux(15.47 L m^(-2)h^(-1))and low reverse salt flux(2.9 g m^(-2)h^(-1))using 1 mol/L Na Cl as the draw solution.This improved FO performance is attributed to the lower structural parameters of HCDs-induced water channels and alleviated internal concentration polarization.Thus,this paper provides a feasible strategy to design the membrane structure and boost FO performance.
