Inkjet printed single walled carbon nanotube as an interlayer for high performance thin film composite nanofiltration membrane.

Inkjet printing process enables rapid deposition of inks with precise amount and location. Moreover, the process can be automated and provide control such as repetitive printing of the inks. Utilizing the advantageous features of the inkjet printing process, we demonstrate the synthesis of thin film composite (TFC) flat-sheet membrane for NF application where single walled carbon nanotube (SWCNT) was deposited via an inkjet printing process, acting as an interlayer between the polyamide (PA) selective layer and polyethersulfone (PES) MF membrane support. By controlling the number of SWCNT printings on the PES membrane, we investigated how the SWCNT interlayer thickness influences the formation of PA selective layer. The best membrane performance was achieved from the TFC membrane synthesized using 15 cycles of SWCNT printing, where both high water flux (18.24 ± 0.43 L m−2 h−1 bar−1) and the high Na 2 SO 4 salt rejection (97.88 ± 0.33%) rates were demonstrated. SWCNT interlayer provided highly porous, interconnected structure with uniform pore size distribution which led to the formation of a defect-free ultrathin PA selective layer. Designing of TFC membrane using the SWCNT deposition via inkjet printing is the new approach and successfully demonstrated the significant improvement in the NF membrane performances. Image 1 • Formation of ultrathin active layer using SWCNT interlayer via inkjet printing. • TFC NF membrane with SWCNT interlayer exhibited high flux and high salt rejection. • Investigate SWCNT interlayer & printing parameters on NF membrane performances. • Role of SWCNT interlayer on ultrathin active layer formation via membrane autopsy. [ABSTRACT FROM AUTHOR]