Mussel-inspired modification of a polymer membrane for ultra-high water permeability and oil-in-water emulsion separation

Abstract

Polydopamine/polyethyleneimine-decorated membranes were fabricated with excellent surface hydrophilicity and high water permeability for oil/water emulsion separation under atmospheric pressure.

Surface engineering of polymer membranes via mussel-inspired chemistry

“…Moreover, this coating is very stable during a long-term rinse. In addition, the authors also co-deposited dopamine and low-molecular-weight polyethyleneimine (PEI) onto the membrane surface [106]. As an amino-rich polymer, PEI can not only react with dopamine via Schiff base or Michael addition reaction, but also provide hydrophilic group for further hydrophilization.…”

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

“…We prepared such a composite membrane by first spray-coating the substrate membrane with SiNPs and then dip-coating the SiNPs coated membrane with PDA [47,48]. The SiNPs, which are inexpensive and chemically inert, were used to increase the surface roughness and create hierarchical morphology that are essential for in-air superhydrophilicity and underwater superoleophobicity.…”

Nanofiltration membranes with narrowed pore size distribution via pore wall modification

“…This is because the PDA/PEI codeposition coatings are chemically robust in water, which are even more stable than PDA. 33 Besides, MPSIs are anchored on the pore walls via covalent bonds, leading to a fairly stable chemical structure. We also modified NFMs by immersing PDA/PEI co-deposition membranes in 2000 mg/mL SMPS aqueous solution for 24 h and the solute rejection was evaluated (Fig.…”