Format:
1 Online-Ressource (34 p)
Content:
Cellulose nanofibers (CNFs) with high hydrophilicity and huge specific surface area have great prospect for upgrading the performance of thin-film composite (TFC) membranes, but the optimal location for their incorporation in the membrane is still unclear. Herein, we studied and compared the effects of nanomaterials locations: i) embedded in the active separation layer (Embedded-CNFs), and ii) as an interlayer between the support layer and the active separation layer (interlayered-CNFs) on the performance of positively charged membrane. The effects of CNFs locations on the TFC membrane’s structure, morphology, physicochemical properties and performance were investigated by a series of characterizations. Compared with the control membrane, both the Embedded-CNFs membrane and interlayered-CNFs membrane had improved separation performance. Specifically, the interlayered-CNFs membrane achieved a significantly improved water flux of 270% (53.1 Lm −2 h −1 at 4 bar) while the embedded-CNFs membrane had an increased flux of 135% with high MgCl 2 rejections. Our work provides insights and directions for designing and constructing of high-performance positively charged composite membranes using environmentally friendly CNFs
Language:
English
