期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 677, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2023.132437
关键词
d -spacing control; Intercalated GO@CS nanosheet; Nanofiltration membrane; Dye separation; Molecular sieving
This study demonstrates a versatile strategy for controlling the interlayer spacing of graphene oxide nanosheets. The prepared chitosan-intercalated nanosheets show high permeability, stability, and anti-fouling ability, indicating great potential for molecular sieving applications.
Molecular intercalation has been widely used for graphene oxide (GO) nanosheets to control interlayer spacing (d-spacing). However, further research is necessary to refine and enhance the precision of d-spacing control. In this study, we demonstrate a versatile strategy to create chitosan (CS) intercalated GO (GO@CS) nanosheets, whose d-spacing can be finely controlled by numbers of linked CS unit. This means the concentration of CS solution directly influences d-spacing of GO, and we can get the desired d-spacing for various applications by modulating the CS concentration. This is benefited from the linear structure of CS ensuring a consistent molecular length. The simulation of molecular structures with different numbers of linked CS unit supports this model. Then, the nanofiltration membranes prepared by these GO@CS nanosheets show high hydrophilicity, strong chemical bonding force, and abundant negative charges, which enhances permeability (water permeance of 91 L m(-2) h(-1) bar(-1)), stability, and anti-fouling ability during dye separation processes, even though they are ultrathin (similar to 70 nm). Notably, the contrasting filtration efficiencies observed for oppositely charged dye molecules indicate a great potential use in molecular sieving.
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