Two dimensional COFs as ultra-thin interlayer to build TFN hollow fiber nanofiltration membrane for desalination and heavy metal wastewater treatment

Recent advances in thin film nanocomposite membranes containing an interlayer (TFNi): fabrication, applications, characterization and perspectives

“…TpPa is a COF, and it is often used in membrane separations because it can be synthesized at normal temperature and pressure and loaded onto the surface of the substrate through in situ growth without affecting the membrane structure. 66–71 Wang et al constructed structurally complete and stable TpPa interlayers on a PI substrate in a manner similar to that reported by Yang et al to control the IP process. The COF interlayer was grown in situ using a low concentration of precursor solution, and the PA separation layer was prepared using low-concentration aqueous and organic solutions.…”

“…64,65 TpPa nanomaterials are often used as COFs in membrane separations because they are synthesized at ambient temperature and pressure, grown in situ and loaded on the surface of the substrate without damaging the membrane structure. 66–71…”

The coming of age of water channels for separation membranes: from biological to biomimetic to synthetic

“…10 In a bid to elucidate the potential of the membranes for practical desalination operation, recent studies have examined the stability of these nanochannel-embedded membranes to typical cleaning agents such as acids, bases, solvents and chlorinated oxidants. The nanochannels studied include AQPs, 64,256,257 CNTs, 258 COFs, 248,259 GO 260–262 and MOFs. 263 For example, a study outlined the stability of AQP-based RO membranes by subjecting them to 5 cycles of chemical cleaning and it was shown that the water flux and salt rejection of the biomimetic membrane remained fairly consistent throughout the long-term test (duration of 100 days).…”

Enhanced water permeability in nanofiltration membranes using 3D accordion-like MXene particles with random orientation of 2D nanochannels

“…The effects of AMXene loading on Fig. 5 (a) Separation performances of the TFC, TFN-MXene, and TFN-AMXene membranes, (b) separation performances of the TFN-AMXene membrane in terms of AMXene loading, (c) correlation between the PWP enhancement factor and effective area enhancement factor of the TFN-AMXene membranes (the PWP enhancement factor is the ratio between the PWP of the TFN-AMXene membrane to that of the TFC membrane, the effective area enhancement factor is the ratio between the effective area for water collection of the TFN-AMXene membrane and that of the TFC membrane, and the effective area of membrane was measured according to a reported method 52 ), (d) inorganic salt rejections of the TNF-AMXene membrane, (e) long-term filtration performance of the TFN-AMXene membrane, and (f) trade-off relationship between water permeability and water/Na 2 SO 4 permselectivity summarized from polyamide NF membranes in the literature, 15,[53][54][55][56][57][58][59][60][61][62][63][64][65][66] commercial TFC NF [67][68][69] and TFN-AMXene membranes in this study.…”

“…52 Fig. 5f shows the trade-off relationship between water permeability and water/Na 2 SO 4 permselectivity summarized from polyamide NF membranes in the literature, 15,[53][54][55][56][57][58][59][60][61][62][63][64][65][66] commercial TFC NF [67][68][69] and TFN-AMXene membranes in this study. It can be found TFN-AMXene overcomes the upper bound of separation performance of the polyamide membranes containing commercial TFC and other laboratory-made TFC and TFN NF membranes.…”