Ultrathin Graphene Oxide-Based Nanocomposite Membranes for Water Purification

Abstract

Two-dimensional graphene oxide (GO)-based lamellar membranes have been widely developed for desalination, water purification, gas separation, and pervaporation. However, membranes with a well-organized multilayer structure and controlled pore size remain a challenge. Herein, an easy and efficient method is used to fabricate MoO2@GO and WO3@GO nanocomposite membranes with controlled structure and interlayer spacing. Such membranes show good separation for salt and heavy metal ions due to the intensive stacking interaction and electrostatic attraction. The as-prepared composite membranes showed high rejection rates (˃70%) toward small metal ions such as sodium (Na+) and magnesium (Mg2+) ions. In addition, both membranes also showed high rejection rates ˃99% for nickel (Ni2+) and lead (Pb2+) ions with good water permeability of 275 ± 10 L m−2 h−1 bar−1. We believe that our fabricated membranes will have a bright future in next generation desalination and water purification membranes.

MXene-based nanocomposites: emerging candidates for the removal of antibiotics, dyes, and heavy metal ions

“…[167][168][169] Due to the extensive usage of organic dyes in different industrial sectors mainly caused numerous diseases, including diarrhea, chronic toxicity, carcinogenicity, genotoxicity, and mutagenicity when associated with the aromatic molecular structure. [170][171][172][173] Annually, 8 Â 10 5 tons of synthetic organic dyes are produced worldwide, which causes environmental pollution. 18,129,171,174,175 Various mechanisms have been reported for the effective separation of organic dyes from wastewater using MXene-based membranes.…”

“…[170][171][172][173] Annually, 8 Â 10 5 tons of synthetic organic dyes are produced worldwide, which causes environmental pollution. 18,129,171,174,175 Various mechanisms have been reported for the effective separation of organic dyes from wastewater using MXene-based membranes. Mainly, electrostatic interactions such as hydrogen bonding and p-p interaction are responsible for the enhanced removal of dyes through MXene-based membranes.…”

High-performance asparagine-modified graphene oxide membranes for organic dyes and heavy metal ion separation

“…Therefore, they limit their practical application in ionic sieving. [39][40][41][42][43] Through the ingenious design and accurate construction of the GO membrane structure, the precise separation of small molecules, metal cations and ions can be realized. Therefore, various strategies such as reduction, cross-linking, etc.…”

Functionalized graphene oxide-based lamellar membranes for organic solvent nanofiltration applications

“…[21][22][23][24][25][26][27][28] The GO nanosheets have the unique combination of hydrophobic and hydrophilic domains along with hydroxyl, epoxide and carboxyl groups on its basal plane and edges. [29][30][31] Such functional groups can attract water molecules and swell in aqueous environment. Therefore, these membranes rapidly delaminated and were destroyed during wastewater separation and purication processes.…”