Crown ether modulated high-performance nanofiltration membrane for water purification

Amphiphilic Interlayer Regulated Interfacial Polymerization for Constructing Polyamide Nanofiltration Membranes with High Perm-Selectivity of Mono-/Divalent Salts

“…Figure d shows the permeability of pure water and the selectivity of NaCl/Na 2 SO 4 of the as-synthesized TFC NF membranes. The pure water permeability of the D-8 layer increased to 25.71 L m –2 h –1 bar –1 because of the lower osmotic pressure of pure water . The selectivity of NaCl/Na 2 SO 4 of the PES/PA membrane was 123.75.…”

“…It can be observed in Figure c that with the increase in feed concentration from 1000 to 5000 ppm, the D-8/PA membrane exhibited a satisfactory rejection value of higher than 99.5%, indicating that the D-8/PA membrane showed good application potential in real wastewater. In addition, the permeability of the D-8/PA membrane tended to decrease, which was owing to the fact that the driving force between the feed and the permeate reduced, caused by the increase of transmembrane pressure difference with the increasing concentration of Na 2 SO 4 feed solution Figure d shows the permeability of pure water and the selectivity of NaCl/Na 2 SO 4 of the as-synthesized TFC NF membranes.…”

Highly Permeable and Fouling-Resistant Polyamide Nanofiltration Membranes with Embedded Boron Nitride Nanosheets for the Purification of Water

“…As shown in Figure b, all of the membranes are highly negatively charged, mainly attributed to the hydrolyzation of residual acyl chloride to −COOH, of which the dissociation endows negatively charged −COO – on the surface of membranes when increasing pH above the isoelectric point . With the increase of BNNS contents, the negative ζ-potential first increases owing to the inhibition of PIP diffusion and the reservation of unreacted acyl chloride.…”