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Antibacterial Performance of a Gold‐Loaded g‐C 3 N 4 Nanocomposite System in Visible Light‐Dark Dual Mode
Author(s) -
Zhang Hongda,
Zhang Xin,
Zhu Minghang,
Li Haiyan,
Zhao Yan,
Han Xuerong,
Jin Lihong,
Shan Haixia
Publication year - 2020
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.202000676
Subject(s) - photocatalysis , visible spectrum , antibacterial activity , nanocomposite , semiconductor , materials science , nanotechnology , photoelectrochemistry , dual mode , nuclear chemistry , analytical chemistry (journal) , chemistry , photochemistry , optoelectronics , electrochemistry , bacteria , chromatography , organic chemistry , electrode , biology , aerospace engineering , engineering , genetics , catalysis
Semiconductor photocatalysis technology, which can kill pathogenic microorganisms in a green and broad‐spectrum way, is a new research field with great application potential. Due to the dependence on light, semiconductor materials have the problems of low utilization rate of sunlight and inactivation under dark conditions. A simple Au‐loaded g‐C 3 N 4 (Au/g‐C 3 N 4 ) nanocomposites was studied. Under dark conditions, the antibacterial efficiency of 1.2 % Au/g‐C 3 N 4 reached 99.1 % relative to 10 5 CFU (Colony‐FormingUnits)/mL E. coli . Under light conditions, the antibacterial efficiency of 0.9 % Au/g‐C 3 N 4 reached 94.1 % relative to 10 7 CFU/mL E. coli . The influence of contact time, Au loading and bacterial concentration on its antibacterial performance under dark conditions was discussed in detail. Through photoelectrochemistry, SEM, TEM and reactive oxygen species (ROS) detection the microscopic charge behaviour was revealed in the system, and a light‐dark dual‐mode antibacterial mechanism was proposed.