Regulating interfacial polymerization via a multi-functional calcium carbonate based interlayer for a highly permselective nanofiltration membrane

Abstract

Highly permselective nanofiltration (NF) membranes have potential in water treatment applications, but overcoming the permeability-selectivity trade-off is a challenge. We introduce in this work a highly permselective NF membrane fabricated...

One-Step Phase Separation and Mineralization Fabrication of Membranes for Oily Wastewater Treatment

“…The adhesive properties can be attributed to the interactions between the TA and PK polymer chains. These interactions predominantly involve hydrophobic interaction, as TA contains hydrophobic regions, hydrogen bonding due to the presence of abundant phenolic hydroxyl groups in TA, and electrostatic interaction. , Therefore, there is a strong interaction between the PK polymer chains, TA, and Ca 2+ ions. , When the casting solution is immersed in the coagulation bath and undergoes phase inversion, part of the Ca 2+ ions is firmly fixed on the polymer matrix through TA instead of diffusing into the coagulation bath. The Ca 2+ ions fixed on the polymer matrix will react with the Na 2 CO 3 in the coagulation bath during the phase separation process, eventually forming CaCO 3 nanoparticles on the surface of the membrane (Figure b).…”

“…The vibration at 871 cm −1 was a composite of two-component peaks at 875 and 866 cm −1 , attributed to calcite and amorphous CaCO 3 , respectively. 26,29 Moreover, the peak intensity is weaker in M1 membranes compared with M2 membranes. This is mainly because the CaCl 2 content in the M1 casting solution is less than the CaCl 2 content in the M2 casting solution.…”

“…24,25 Therefore, there is a strong interaction between the PK polymer chains, TA, and Ca 2+ ions. 22,26 When the casting solution is immersed in the coagulation bath and undergoes phase inversion, part of the Ca 2+ ions is firmly fixed on the polymer matrix through TA instead of diffusing into the coagulation bath. The Ca 2+ ions fixed on the polymer matrix will react with the Na 2 CO 3 in the coagulation bath during the phase separation process, eventually forming CaCO 3 nanoparticles on the surface of the membrane (Figure 2b).…”