Bio‐inspired method to fabricate poly‐dopamine/reduced graphene oxide composite membranes for dyes and heavy metal ion removal

Abstract

Due to the narrow layer spacing, graphene oxide (GO) composite membrane usually exhibits a relatively low water flux in the process of wastewater treatment. In this study, GO was reduced to reduced graphene oxide through a bio-inspired method, which was functionalized modified by poly-dopamine (PDA). Then a series of PDA/reduced graphene oxide sheet films were prepared by vacuum filtration on the surface of cellulose acetate membrane (under the pressure of −0.1 MPa). The result indicated that the novel membranes had an excellent stability owing to the cross-link of PDA. In addition, the hydrophilicity of membrane was increased significantly after PDA modification, which presented a superior water flux than pure GO composite membrane. More importantly, as-prepared membranes were successfully applied for the removal of dyes (including Congo red, methylene blue, and rhodamine B) and heavy mental ion (Cu(II)) from simulated wastewater. This work might provide a new method for preparation and application of GO composite membranes.

Enhancement of Cd2+ removal from aqueous solution by multifunctional mesoporous silica: Equilibrium isotherms and kinetics study

“…Adsorption, reverse osmosis, solvent-based extraction, membrane processes, ion exchange, evaporation, and chemical precipitation are common methods for removing heavy metals such as cadmium from contaminated water. [3,[8][9][10][11]. Most of these approaches are not economic and generate a considerable amount of sludge.…”

Preparation of stable and superior flux GO/LDH/PDA‐based nanofiltration membranes through electrostatic self‐assembly for dye purification

“…LDH nanoplates were synthesized by coprecipitation method, which have been reported by previous literatures . MgCl 2 ·6H 2 O and AlCl 3 ·6H 2 O with the molar ratio of 2:1 were dissolved in 80 mL deionized water denoted as mix salt solution A.…”

“…Amussel‐inspired bioglue, dopamine, with amusing structures and distinctive properties, could self‐polymerize and adhere onto virtually any type of material surface, regardless of the material's properties . In addition, polydopamine (PDA) coatings possess extremely hydrophilic surface and effectively absorb dye ability owing to various functional groups such as amino, imino, and phenolic hydroxyl . For self‐assembly membrane, PDA coatings are just like a pair of hands, one fixing deposited nanoparticles another one holding the supporting layer tightly …”

“…[37][38][39] In addition, polydopamine (PDA) coatings possess extremely hydrophilic surface and effectively absorb dye ability owing to various functional groups such as amino, imino, and phenolic hydroxyl. 39,40 For self-assembly membrane, PDA coatings are just like a pair of hands, one fixing deposited nanoparticles another one holding the supporting layer tightly. 41 Herein, the negatively charged GO was self-assembled with the positively charged LDH via electrostatic interaction.…”

Porous Scaffolds Based on Polydopamine/Chondroitin Sulfate/Polyvinyl Alcohol Composite Hydrogels

“…Dopamine (DA) is secreted from marine mussels. It is easy to polymerize polydopamine (PDA) nanoparticles through oxidation cross-linking reactions in aqueous solution [ 26 ], which has potential applications for biomedicine, bioelectronics, and coatings [ 27 , 28 , 29 ]. PDA has been proven to enhance cell attachment and proliferation [ 30 ] as well as have strong adhesion to various substrates [ 31 ].…”