Effect of diamine monomer groups on structure and performance of polyamide nanofiltration membranes with porous organic polymers interlayers

Polyamide (PA) thin-film composite (TFC) nanofiltration (NF) membranes, which are extensively utilized in seawater desalination and water purification, are limited by the upper bounds of permeability-selectivity. Recently, constructing an interlayer between the porous substrate and the PA layer has been considered a promising approach, as it may resolve the trade-off between permeability and selectivity, which is ubiquitous in NF membranes. The progress in interlayer technology has enabled the precise control of the interfacial polymerization (IP) process, which regulates the structure and performance of TFC NF membranes, resulting in a thin, dense, and defect-free PA selective layer. This review presents a summary of the latest developments in TFC NF membranes based on various interlayer materials. By drawing from existing literature, the structure and performance of new TFC NF membranes using different interlayer materials, such as organic interlayers (polyphenols, ion polymers, polymer organic acids, and other organic materials) and nanomaterial interlayers (nanoparticles, one-dimensional nanomaterials, and two-dimensional nanomaterials), are systematically reviewed and compared. Additionally, this paper proposes the perspectives of interlayer-based TFC NF membranes and the efforts required in the future. This review provides a comprehensive understanding and valuable guidance for the rational design of advanced NF membranes mediated by interlayers for seawater desalination and water purification.

Modeling insights into the role of support layer in the enhanced separation performance and stability of nanofiltration membrane

Distinct impact of substrate hydrophilicity on performance and structure of TFC NF and RO polyamide membranes

High permeance of polyamide nanofiltration membranes with porous organic polymers interlayers based on diazo coupling reaction

Heavy metal elimination from drinking water using nanofiltration membrane technology and process optimization using response surface methodology

Enhancing the desalination performance of polyamide nanofiltration membranes via in-situ incorporation of zwitterionic nanohydrogel

Nanofiltration membrane performance on fluoride removal from water

Effect of fatty acids on the structure and performance of cellulose acetate nanofiltration membranes in retention of nitroaromatic pesticides

A high performance silica–fluoropolyamide nanofiltration membrane prepared by interfacial polymerization

Effective functionalization of porous polymer fillers to enhance CO2/N2 separation performance of mixed-matrix membranes

Concentration of clindamycin phosphate aqueous ethanol solution by nanofiltration

How to understand the effect of relative humidity on the morphology and performance of polypiperazine-amide NF membrane during heat curing process

How to understand the effects of heat curing conditions on the morphology and performance of polypiperazine-amide NF membrane

Dissecting the impacts of nanobubbles and heat generated in polymerization on polyamide nanofiltration membranes

Inspired by the specific amino acid sequence Asn-Pro-Ala (NPA) of water channel aquaporins (AQPs), we fabricated polyamide (PA) nanofiltration (NF) membranes by introducing reduced glutathione (GSH) in interfacial polymerization (IP) method. Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectrometry (XPS), scanning electron microscope (SEM), atomic force microscopy (AFM), zeta potential and static water contact angle measurement were employed to characterize the chemical composition, morphology, electronegativity and hydrophilicity of the NF membranes. The water flux of GSH/PIP-TMC NF membrane reached 32.00 L m-2 h-1 at 0.2MPa, which was approximately twice than that of pristine PIP-TMC NF membrane when the ratio of GHS to piperazidine (PIP) was 40% during IP process. More water channels were built as GSH was embedded into PA layer. The fabricated NF membranes also took on potent rejection for dyes and Na2SO4. This study presents a simple and facile method to simulate water channels-based biological materials which may find potential application in water treatment.