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

Abstract

a b s t r a c tA green method to prepare asymmetric positively charged poly(arylene ether sulfone) nanofiltration (NF) membranes was explored by grafting water-soluble poly (ethylene imine) (PEI) onto a poly (arylene ether sulfone) membrane containing tertiary amine groups (PES-TA) and cross-linking with poly(ethylene glycol) diglycidyl ether (PEGDGE). The modifications were shown to increase the positive charge and decrease the pore size of the PES-TA substrate. The optimized NF membrane displayed a pure water flux of 15.5 L m À 2 h À 1 . Membrane rejection NaCl, MgCl 2 , and methyl violet (MV) (at a constant pressure of 4 bar) were measured to be 46.2%, 94.9%, and 99.8%, respectively. Moreover, the membrane maintained excellent chlorine resistance during 100 h of exposure to chlorine. Thus, the membrane shows potential for water desalination and purification applications.

Graphene Oxide Quantum Dots Incorporated into a Thin Film Nanocomposite Membrane with High Flux and Antifouling Properties for Low-Pressure Nanofiltration

“…During the NF process, the surface charges can dramatically influence the membrane performance due to the Donnan effects . Therefore, the surface ζ-potentials of the TA/GOQDs TFN membranes prepared at different concentrations of GOQDs in the aqueous phase were detected under pH 7.0, and the results are shown in Figure .…”

Preparation of Layer-by-Layer Nanofiltration Membranes by Dynamic Deposition and Crosslinking

“…The preparation methods of NF membrane mainly include phase inversion [ 10 , 11 ], interfacial polymerization [ 12 ], grafting [ 13 ] and film deposition on a preformed substrate [ 14 ]. Most of the methods prepare membranes with negatively charged surface.…”

Sustainable Fabrication of Organic Solvent Nanofiltration Membranes

“…Moreover, a sustainable development can only be realized when it satisfies the current needs without undermining the ability of next generations to meet their own needs. Ideally, a process should comply with green principles [6], such as effective waste prevention, better atom economy, replacement of hazardous chemicals with safer alternatives, and higher energy efficiency. [10], (B) TIPS (reprinted with permission from) [11], and (C) VIPS and EIPS (reprinted with permission from) [12].…”