期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 274, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119095
关键词
Graphitic carbon nitride; Polyethylenimine; Antibacterial; Metal-free photocatalyst; Bacteria-photocatalyst interface
资金
- Australia Research Council [DP 180102062]
Graphitic carbon nitride (C3N4) has gained broad attention as a metal-free photocatalyst for water disinfection. However, the low photocatalytic bactericidal activity of pristine C3N4 limits its applications. Here, we report a facile method to boost the photocatalytic disinfection activity of C3N4 with polyethyleneimine (PEI). With PEI modification, the generation of long-lifespan reactive oxygen species (ROS,center dot O-2(-) and H2O2) in photocatalysis is significantly improved. Additionally, scanning electron microscopy and the atomic force microscopy force spectroscopy characterization reveal that PEI promotes the bacteria-photocatalyst contact via electrostatic adhesion. Due to the synergistic modulation of ROS generation and bacteria-photocatalyst interaction, the photocatalytic bactericidal activity of C3N4 is dramatically enhanced after PEI modification. Notably PEI/C3N4 composite achieves 6.2 logs of inactivation efficiency for Escherichia coll. within 45 min and 4.2 logs for Enterococcus faecalis within 60 min under simulated solar irradiation. Overall, this work provides insights on designing metal-free photocatalysts with judicious polymer for antibacterial applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据