title: Graphene Oxide Quantum Dots Covalently Functionalized PVDF Membrane with Significantly-Enhanced Bactericidal and Antibiofouling Performances.
abstract: Covalent bonding of graphene oxide quantum dots (GOQDs) onto amino modified polyvinylidene fluoride (PVDF) membrane has generated a new type of nano-carbon functionalized membrane with significantly enhanced antibacterial and antibiofouling properties. A continuous filtration test using E. coli containing feedwater shows that the relative flux drop over GOQDs modified PVDF is 23%, which is significantly lower than those over pristine PVDF (86%) and GO-sheet modified PVDF (62%) after 10 h of filtration. The presence of GOQD coating layer effectively inactivates E. coli and S. aureus cells, and prevents the biofilm formation on the membrane surface, producing excellent antimicrobial activity and potentially antibiofouling capability, more superior than those of previously reported two-dimensional GO sheets and one-dimensional CNTs modified membranes. The distinctive antimicrobial and antibiofouling performances could be attributed to the unique structure and uniform dispersion of GOQDs, enabling the exposure of a larger fraction of active edges and facilitating the formation of oxidation stress. Furthermore, GOQDs modified membrane possesses satisfying long-term stability and durability due to the strong covalent interaction between PVDF and GOQDs. This study opens up a new synthetic avenue in the fabrication of efficient surface-functionalized polymer membranes for potential waste water treatment and biomolecules separation.
authors.affiliation: Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Interdisciplinary Graduate School, Nanyang Technological University, Singapore.|School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore.
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Zeng
authors.affiliation: School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, China.
authors.forename: Dingshan
authors.initials: D
authors.lastname: Yu
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore.
authors.forename: Ziming
authors.initials: Z
authors.lastname: He
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore.
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore.
authors.forename: Fang-Xing
authors.initials: FX
authors.lastname: Xiao
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Interdisciplinary Graduate School, Nanyang Technological University, Singapore.
authors.forename: Rong
authors.initials: R
authors.lastname: Wang
authors.affiliation: Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY, USA.
authors.forename: Dibakar
authors.initials: D
authors.lastname: Bhattacharyya
authors.affiliation: School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore.
authors.forename: Timothy Thatt Yang
authors.initials: TT
authors.lastname: Tan
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D057219:Biofouling; D004926:Escherichia coli / Q000187:drug effects* / Q000648:ultrastructure; D006108:Graphite / Q000494:pharmacology*; D008567:Membranes, Artificial; D008826:Microbial Sensitivity Tests; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry*; D045663:Quantum Dots / Q000737:chemistry* / Q000648:ultrastructure; D017550:Spectroscopy, Fourier Transform Infrared; D013211:Staphylococcus aureus / Q000187:drug effects*; D005465:Fluorocarbon Polymers
chemical_list: D000900:Anti-Bacterial Agents; D006108:Graphite; D008567:Membranes, Artificial; D011092:Polyethylene Glycols; D011145:Polyvinyls; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers
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