A CO2-responsive graphene oxide/polymer composite nanofiltration membrane for water purification

作者：Dong, Liangliang; Fan, Weizheng; Tong, Xia; Zhang, Hongji; Chen, Mingqing^*; Zhao, Yue^*

来源：Journal of Materials Chemistry A, 2018, 6(16): 6785-6791.

DOI：10.1039/c8ta00623g

• HEAVY-METAL REMOVAL
• RESPONSIVE POLYMERS
• CARBON NANOTUBES
• OXIDE MEMBRANES
• CO2 CAPTURE
• SEPARATION
• DESALINATION
• POLYDOPAMINE
• WETTABILITY
• PERMEATION

A "smart" graphene oxide (GO) based nanofiltration membrane was prepared through electrostatic and pi-pi interaction-driven complexation with poly(N,N-diethylaminoethyl methacrylate) bearing a pyrene end group (Py-PDEAEMA). The composite membranes show a number of attributes potentially appealing for water treatment. First, they display reversible, gas-tunable water permeability between the pore closure state under CO2 stimulation and the pore opening state upon Ar bubbling. The water permeability remains much higher than that of a pure GO membrane even at the pore closure state. Secondly, the separation of organic dye molecules from water using this membrane is similarly efficient as that using a pure GO membrane despite the much higher water permeability. Finally, as a result of CO2-induced reversal of the charge sign, the composite membrane shows an excellent trade-off between rejection of some salts like MgCl2 and water permeability, with both much higher rejection and permeability compared to a pure GO membrane. This study of a CO2-responsive, GO-based nanofiltration membrane, the first of its kind, demonstrates new perspectives in developing smart separation membranes for water purification.

• 出版日期2018-4-28
• 单位江南大学