Single-walled carbon nanotube buckypaper as support for highly permeable double layer polyamide/zeolitic imidazolate framework in nanofiltration processes

The development of membranes for nanofiltration applications requires not only selective layers but also suitable supports to control their synthesis as well enable efficient and competitive membrane performances. Single-walled carbon nanotube free-standing films (denoted buckypaper) have been used the preparation polyamide (PA) by interfacial polymerization (IP) tested dead-end dyes removal (265–1017 Da) from water organic solvents. arrangement phases during IP is essential, thus impregnation on buckypaper support, first with phase then aqueous inverse IP, iIP) leads permeances (of up 28.0 31.4 L m?2 h?1 bar?1 methanol, respectively) rejection values (>96%) that exceed those prepared reversing order. Secondly, a double layer PA/zeolitic imidazolate framework (ZIF-8 or ZIF-93) was (bp). design this led superior performance, in particular hydrophilic ZIF-93, it changes PA properties (increasing both hydrophilicity surface roughness) providing higher (up 59.3 76.0 dye rejections (>98.5%) than bare iIP. This attractive performance PA/ZIF-93/bp has corroborated experiments cross-flow salt solutions, long-term stability study separation after chlorine treatment. results reported here therefore show enormous potential these architectures variety processes.