Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 601, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2020.117948
Keywords
Graphene oxide; g-C3N4; Molecular separation; Nanofiltration; Glycine
Categories
Funding
- National Natural Science Foundation of China [21808072]
- Start-Up Scientific Research Funds for Newly Recruited Talents of Huaqiao University [18BS102, 16BS501]
- Quanzhou City Science & Technology Program of China [2018C124R, 2018C129R]
- Postgraduates' Innovative Fund in Scientific Research of Huaqiao University
Ask authors/readers for more resources
In this work, we fabricated a series of composite membranes for nanofiltration by filtration-assisted assembly of graphene oxide (GO, with a thickness of ca. 2 nm) and graphitic carbon nitride (g-C3N4, with a thickness of ca. 5.2 nm) nanosheets with the assistance of glycine as a molecular linker to enhance their interactions. The effects of g-C3N4 and glycine concentrations on the lamellar spacing of GO and membrane performance were subsequently investigated. Interestingly, experimental and characterization results showed that both g-C3N4 and glycine could increase the interlayer spacing of pristine GO membranes, but the former reduced the dimensions of nanochannels while the latter led to enlarged channels. As compared with pristine GO membranes, the composite membranes resulted in faster water transportation without sacrificing solute retention. With further functionalization by introducing hyperbranched polyethyleneimine (HPEI) coating, we demonstrated that an integrated Gly-GO/g-C3N4 membrane (ca. 116 nm in thickness) exhibited excellent separation performance for various organic dye solutions under different operational conditions (feed concentration, pH, etc.). Long-term stability experiments showed that this membrane yielded 90%-93% dye rejection with only a slight decline in permeance over a 40 h testing period, indicating acceptable stability. The pure water permeance of the Gly-GO/g-C3N4 membrane reached as high as 207 L h(-1) m(-2) bar(-1). These results indicate that the covalent modification of small molecules can improve the packing of GO nanosheets and lead to outstanding nanofiltration performance which has great potential applications in the field of water purification and separation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available