Preparation of molecular selective GO/DTiO2-PDA-PEI composite nanofiltration membrane for highly pure dye separation
The state-of-the-art graphene oxide (GO) has been wildly used in water purification due to its tunable nanoscale interlayer between the two-dimensional nanosheets. However, the structural instability and flux decline performances significantly limit the practical application of GO-based membranes. H...
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Published in | Journal of membrane science Vol. 601; p. 117727 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.03.2020
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Subjects | |
Online Access | Get full text |
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Summary: | The state-of-the-art graphene oxide (GO) has been wildly used in water purification due to its tunable nanoscale interlayer between the two-dimensional nanosheets. However, the structural instability and flux decline performances significantly limit the practical application of GO-based membranes. Herein, a novel GO/DTiO2-PDA-PEI (dopamine modified TiO2) composite nanofiltration membrane has been prepared via a multi-coupled strategy, combining with the self-assembly, copolymerization and surface grafting. Tuning the nanoscale interspace between the GO nanosheets, and constructing the membrane with positively charged surface and negatively charged subsurface, the loose GO/DTiO2-PDA-PEI composite nanofiltration membrane (GDP1P2-0.6 membrane with a mean pore size = 0.87 nm) show the filtration performance with water permeance as high as 41.6 L m−2 h−1 bar−1 and dye rejection around 99.9%, and the molecular selective factor (Eriochrome black T/Na2SO4) of α = 47.6. Long-term performance and stimulation have been investigated to further analyze the dye concentration and salt removing. The investigations demonstrate that the GO/DTiO2-PDA-PEI composite nanofiltration membrane enriches 14.9-fold Eriochrome black T (ET) and reduces Na2SO4 to 0.36% in the term of the concentration factor 15 and batch diafiltration factor 5.
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•A novel GO/DTiO2-PDA-PEI composite nanofiltration membrane is synthesized via a multi-coupled strategy, combining with self-assembly, copolymerization and surface grafting.•Tuning the nanoscale interspace between the GO nanosheets and constructing the membrane with positively charged surface resulted in high permeation of pure water and ions.•The GO/DTiO2-PDA-PEI composite nanofiltration membrane (GDP1P2-0.6) shows the satisfied filtration performance with effective molecular selectivity.•GO/DTiO2-PDA-PEI composite nanofiltration membrane could enrich 14.9-fold Eriochrome black T (ET) and reduce Na2SO4 to 0.36% after the diafiltration process. |
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ISSN: | 0376-7388 1873-3123 |
DOI: | 10.1016/j.memsci.2019.117727 |