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Alkane Chain-Bearing Pyridylboronic Acid-Grafted Graphitic Carbon Nitride-Loaded Polyacrylonitrile Membrane for Efficient Photocatalytic Bacterial Killing
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PRE
AI
张
Y
X
S
S
Y
W
H
Y
王
J
DOI：10.1021/acsbiomaterials.5c01237.png)
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Abstract
En 中文
A positively charged ammonium side chain, a pyridylboronic acid side chain, and mixed two moieties were grafted on intrinsic g-C3N4 to yield functionalized materials, g-C3N4-C4, g-C3N4-B, and g-C3N4-C4-B. All the decorated g-C3N4 materials displayed enhanced photocatalytic ROS (1O2 and •O2–) generation capabilities compared to intrinsic g-C3N4. Among them, g-C3N4-B displayed the most potent ROS generation capability. In addition, ξ potential results revealed the strongest affinity of g-C3N4-C4-B toward representative Gram-negative and positive bacteria (MDR Acinetobacter baumannii and Staphylococcus aureus). The photocatalytic antibacterial results demonstrated that g-C3N4-B could achieve faster and efficient bacterial killing compared with g-C3N4-C4 and g-C3N4-C4-B (>99% killing rates toward MDR A. baumannii and S. aureus and >95% toward Escherichia coli). Thus, it could be concluded that ROS generation capability plays a more important role in photocatalytic antibacterial activity over bacterial binding capability in the current case. g-C3N4-B was further fabricated into a PAN fiber membrane for photocatalytic antibacterial application. The 0.8 wt % g-C3N4-B-loaded PAN membrane showed potent antibacterial activities toward MDR A. baumannii, S. aureus, and E. coli, with efficiencies of 99.79%, 99.37%, and 99.96%, respectively. Thus, g-C3N4-B could serve as a potent broad-spectrum photocatalytic antibacterial material. And we proposed a novel strategy for improving photocatalytic antibacterial activity for g-C3N4.
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