纳米纤维
膜
聚乙烯醇
静电纺丝
剥脱关节
材料科学
壳聚糖
石墨氮化碳
光催化
核化学
化学工程
催化作用
化学
聚合物
纳米技术
有机化学
复合材料
石墨烯
生物化学
工程类
作者
Xuemei Bai,Tingting Song,Jingmin Luan,Meijuan Chen,Jianxiang Yu,Huafeng Tian
摘要
Abstract The visible light catalytic antibacterial nanofiber membranes as a novel functional material were designed to solve the problem of bacterial infection and water pollution. In this work, oxygenated graphite carbon nitride nanosheets (O‐g‐C 3 N 4 ) with 12% oxygen content were synthesized through thermal polycondensation followed by chemical oxidation. Exfoliation and dispersion of O‐g‐C 3 N 4 were strongly enhanced compared to pristine g‐C 3 N 4 due to rich hydrophilic carboxyl and hydroxyl groups. The amount of ROS generated by O‐g‐C 3 N 4 was about 13.8% more than that of g‐C 3 N 4. Then, the polyvinyl alcohol (PVA)/chitosan (CS)/O‐g‐C 3 N 4 (PCO) composite nanofiber membranes were prepared by electrospinning. The contact angle of the PCO nanofiber membranes decreased from 55.0° ± 0.5 to 45.9° ± 0.2 along with the increased amount of O‐g‐C 3 N 4 , indicating the improvement of hydrophilicity. Meanwhile, the diameter of nanofibers increased from 148.0 ± 22.9 nm to 244.0 ± 52.3 nm with the loading ratio from 0% to 17%. The PCO nanofiber membranes exhibited significantly higher antibacterial activity compared to the blank nanofiber membranes and bare O‐g‐C 3 N 4 . The maximum diameter of the inhibition zone against Escherichia coli and Staphylococcus aureus could reach 26 ± 0.1 mm and 16 ± 0.2 mm, respectively. The inhibition rate against E. coli could reach 97% in 24 h under the irradiation of simulated sunlight. Based on reactive oxygen species (ROS) testing, zeta potential, and bacterial inhibition experiments, a possible synergistic mechanism was proposed. The electrostatic adsorption effect of PCO nanofiber membranes and ROS could effectively decompose the organic components of bacteria and destroy their structural integrity. The results indicated that the antibacterial PCO composite nanofiber membranes have wide application prospects in biomedical‐related fields.
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