Atomic insight into water and ion transport in 2D interlayer nanochannels of graphene oxide membranes: Implication for desalination

Fabrication of a graphene oxide-embedded separation bilayer composite nanofiltration membrane using a combination of layer-by-layer self-assembly and interfacial polymerization

“…19 The unique wrinkle and defect structure of GO may produce micropores or nanochannels to promote the penetration of water molecules. 20 The electrostatic gravity of the GO and PDDA could not only fix the GO in the PE layer, but the GO tends to distribute along its horizontal direction, thereby facilitating improved NF membrane interception performance and increasing the permeability of the NF membrane. When the GO concentration was higher than 1.00 g L −1 , the flux and rejection of the (PE + GO) 2.5 –PA NF membrane began to decline, which may be due to excessive GO agglomeration leading to uneven distribution of GO in the polymer functional layer, reducing the attraction of membrane pores to water molecules.…”

Recent Progress on Nanomaterial-Based Membranes for Water Treatment

“…In addition, the GO membrane application in several water treatment processes is limited by the tradeoff between selectivity and permeability. Li, et al [229] investigated the water and ion transport mechanisms in the two-dimensional nanochannels of the GO membrane for the development of GO membranes for a desalination process. The authors found there was an interaction between the oxygen-containing groups in the GO nanosheets and the water/ion, which proved there was successful transport.…”

“…The authors found there was an interaction between the oxygen-containing groups in the GO nanosheets and the water/ion, which proved there was successful transport. Thus, GO membranes was efficiently used in the desalination process [229]. The major industrial effluent that pollutes the environment is oily wastewater.…”

A New Method for a Polyethersulfone-Based Dopamine-Graphene (xGnP-DA/PES) Nanocomposite Membrane in Low/Ultra-Low Pressure Reverse Osmosis (L/ULPRO) Desalination

“…The thickness of the skin layer was critical due to its ability to limit solute transport, to attain membranes which can be applicable for seawater desalination applications. Furthermore, the presence of graphene within this network also enhanced the size exclusion of anions and cations due to its small interlayer spacing (~0.34 nm) [30,33,[41][42][43]. 4 illustrates the surface analysis of the membranes by both scanning and atomic force microscopy.…”