Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 210, Issue -, Pages 737-745Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2018.08.065
Keywords
Graphene oxide (GO); Graphene-based membrane; Dye separation; Nanofiltration; 2D material
Categories
Funding
- Science and Technology Commission of Shanghai Municipality [14520502900]
- Ministry of Education of China [PCSIRT_IRT_16R49]
- International Joint Laboratory on Resource Chemistry (IJLRC)
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Graphene oxide (GO) as a unique 2D material attracts much attention. It can be employed to prepare graphenebased membranes by vacuum filtration on microporous substrates. However, the permeability of graphene-based membranes is mainly limited by its interlamellar spacing. In this work, the interlamellar spacing of graphene-based membranes is expanded by grafting poly (ethylene imine) (PEI) on GO sheets. The novel graphene-based membranes present ultrahigh permeability without sacrificing the rejection for the filtration of dye wastewater. The original GO membrane (GOM) only has a pure water permeation flux (PWP) value of 27.0 L.m(-2).h(-1) bar(-1). However, the novel graphene-based membranes prepared with the modified GO by PEI.600 and PEI -10000 (recorded as PGOM-600 and PGOM-10000) markedly increase to 208.1 and 450.2 L.m(-2).h(-1) bar(-1). respectively. In the separation of dye wastewater, GOM, PGOM600 and PGOM-10000 exhibit much higher rejections for direct red and methyl blue. However, the modified graphene-based membranes (PGOM-600 and PGOM-10000) present more than 7-20 times higher permeation flux than that of original GOM without sacrificing dye rejection. Thus, this work provides graphene-based membranes with ultrahigh permeation flux for dye removal from wastewater.
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