A large-area free-standing graphene oxide multilayer membrane with high stability for nanofiltration applications

By Long Chen, Yanhui Li, Lina Chen, Naichao Li, Chenglong Dong, Qiong Chen, Beibei Liu, Q. Ai, P. Si, Jinkui Feng and 4 more. Chemical Engineering Journal, 2018

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Abstract A flexible and free-standing graphene oxide and nylon 6 (GO@nylon 6) multilayer nanofiltration membrane was prepared by a layer-by-layer assembly process. The combination of electrospinning and electrospraying technique was employed, which can facilely prepare large-area membrane with size of 20×30 cm. The mechanical stability of multilayer membrane has enhanced significantly due to the tightly locked structure achieved by nylon 6 nanofibers network. The novel GO@nylon 6-13 multilayer nanofiltration membrane demonstrated a pure water flux up to 11.15 L m -2 h -1 bar -1 , while keeping high organic dye rejection rate (>95% for methyl blue, and >99% for methylene orange). The rejections rate of the Na 2 SO 4 , NaCl, CuSO 4 , and Pb(NO 3 ) 2 were 56.5%, 27.6%, 36.7%, and 18.9%, respectively. Furthermore, GO@nylon 6-13 multilayer nanofiltration membrane also demonstrated a high flux of some common organic solvents (8.4, 5.3, and 0.8 L m -2 h -1 bar -1 for methanol, ethanol, and NMP, respectively), showing excellent chemical stability for separation process in those solvents.

Subfields: Biomedical Engineering, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/9923b55b4df79e541ca0cab7f7bd2aa3f2fcf286