期刊
JOURNAL OF MEMBRANE SCIENCE
卷 563, 期 -, 页码 336-344出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2018.05.073
关键词
Graphene oxide membrane; Wrinkling; Oxalic acid; Surface modification; Assembling
资金
- American Chemical Society Petroleum Research Fund [55570-DNI10]
- NSF [CBET-1603264]
- National Energy Solutions Institute - Smart Energy Source (NESI-SES)
- Technology and Business Development Program (TBDP) [P2017-0033]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1603264] Funding Source: National Science Foundation
Graphene oxide (GO) membrane assembling through edge-edge or plane-plane connection has huge influence on membrane microstructure and thus separation performance. In this work, plane-plane connection of GO sheets was promoted in supported GO membranes by grafting oxalic acid (OA) molecules in GO basal plane. With subsequent crosslinking by ethylene diamine (EDA), better packing structure can be achieved with reduced wrinkling in GO membrane. With this unique approach, restricted swelling, tightly packed laminar structure, reduced wrinkling and improved separation property can be simultaneously achieved. Specifically, membranes were prepared on polydopamine coated porous polyethersulfone (PES) support via pressurization filtration method. GO membrane thickness was controlled within the range of 100-400 nm with d-spacing of <1.0 nm. The OAGO/EDA membrane shows good permselective H-2/CO2 separation with separation factor of 16.14 and H-2 permeance of 1.362x10(-8) molm(-2) s(-1) Pa-1. This membrane also excels in liquid separation, where methylene blue rejection rate of 99.9% and ion (Na+, K+, Mg2+, Cl-, and SO42-) rejection rate of >98.1% were achieved.
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