Effects of chlorine exposure on nanofiltration performance of polyamide membranes

Green fabrication of a positively charged nanofiltration membrane by grafting poly(ethylene imine) onto a poly (arylene ether sulfone) membrane containing tertiary amine groups

“…The alkaline NaOCl solution caused neutralization of the positive charges on the PES-TA-PEGDGE-PEI membrane surface by hydroxide ions, affecting the salt rejection of the membrane. Polyamide membranes typically degrade because chlorine attacks amide bonds (-CO-NH-) [33,34]. The PES-TA-PEGDGE-PEI membrane has no amide bonds and is therefore predicted to show minimally sensitivity to chlorine exposure.…”

A novel positively charged composite nanofiltration membrane based on polyethyleneimine with a tunable active layer structure developed via interfacial polymerization

“…Similar morphologies have been reported in the literatures. 38,41,43,46,47 Based on the above results, it could be concluded that a thin functional active layer has been successfully prepared onto the PSF UF substrate via the interfacial polymerization between PEI and a mixture of IPC and TMC. As the total mass of acyl chloride was set at a certain value, the higher mass ratio of IPC to TMC was, the more -NH 2 would be remained.…”

“…5(b-d), a new strong absorbance peak appeared at 1686 cm À1 , which could be attributed to the characteristic peak of the C]O stretching. 38,39,[46][47][48][49] Another new peak with wide and strong absorbance presented at 3400 cm À1 might be attributed to the N-H stretching peak in PEI molecule. 36,43,49,50 The two new absorbance peaks suggested that amine groups of PEI interacted with acyl chloride groups of IPC and TMC at interface and produced the amide bond.…”

An aqueous sol–gel process for the fabrication of high-flux YSZ nanofiltration membranes as applied to the nanofiltration of dye wastewater

“…8a, the pure water fluxes of the membranes increased linearly with increasing pressure, and the water fluxes of the YSZ NF membrane were significantly decreased after just one coating of the sol on the ZrO 2 substrate with a water permeability of ~110 L m -2 h -1 bar -1 . The pure water permeability of the YSZ NF membrane was ~28 L m -2 h -1 bar -1 , which was higher than those of the similar polymer membranes [35][36][37]. The PEG retention for the ZrO 2 support was nearly 0.…”