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

Influence of the Zeolite ZSM-22 Precursor on a UF-PES Selective Substrate Layer for Salts Rejection

“…This is attributed to a change in pore sizes as the wt.% of zeolite loading increases. The micrographs also reveal a good dispersion of the additives into the polymer film and as the wt.% loading increase, the near-surface zeolite appearance could be observed in agreement with the previously reported works [48,75,76]. Also, the obtained macrostructures exhibit a uniform macroporous distribution on the surface of the obtained membranes.…”

Highly stable Pebax® Renew® thin-film nanocomposite membranes with metal organic framework ZIF-94 and ionic liquid [Bmim][BF4] for CO2 capture

“…2e, revealing a similar spectrum for ZIF-94 (SALE) than for ZIF-94 (OR), with the main bands of ZIF-94 at 1660 cm À1 , which corresponds to the aldehyde group (-CHO), 47 and 1496 cm À1 , related to the C]C bond. Besides the similar FTIR spectra of ZIF-94 (SALE) and (OR), the absence of the main bands of ZIF-8 at 1147 cm À1 and 993 cm À1 (both corresponding to the C-N bond) 48 agree with the successful ligand exchange. The N 2 adsorption isotherms and BET SSA values also conrm the ligand exchange (Fig.…”

“…ZIF-94, as ZIF-8, is a Zn 2+ based MOF but with 4-methyl-5-imidazolate-carboxyaldehyde as organic linker, which makes it hydrophilic as compared to ZIF-8 (ref. 48 and 61) and also more inclined to adsorb CO 2 (the CO 2 uptake of ZIF-8 at 298 K and 1 bar being 0.7 mmol g −1 (ref. 62 and 63) and that of ZIF-94, 2.4–2.9 mmol g −1 (ref.…”

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

“…The nanochannels studied include AQPs, 64,256,257 CNTs, 258 COFs, 248,259 GO [260][261][262] and MOFs. 263 For example, a study outlined the stability of AQPbased 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). 64 Also, empirical evidence suggests that some nanochannels can also take part in the IP reaction and alter the free volume, cross-linking degree and height of the selective layer, thereby indirectly affecting the membrane permeability.…”

“…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). 64…”