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J Nanosci Nanotechnol. 2019 Jul 1;19(7):3982-3990. doi: 10.1166/jnn.2019.16320.

Antibacterial Nanorods Made of Carbon Quantum Dots-ZnO Under Visible Light Irradiation.

Author information

1
Guangdong Engineering and Technology R&D Center of Graphene or Its Like Materials and Products, Department of Chemistry, Jinan University, Guangzhou, Guangdong 510632, China.
2
School of Chemistry and Chemical Engineering, Guangzhou University, 510006, China.
3
State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou 510070, China.

Abstract

Due to secondary pollution from bactericidal substances, the importance of eliminating microbial contamination has become a controversial topic. Three antibacterial nanorod materials of carbon quantum dots-zinc oxide (1/3CQDs-ZnO, CQDs-ZnO, and 2CQDs-ZnO), in which ZnO nanorods are surrounded by carbon quantum dots (CQDs), were successful prepared via in-situ sol-gel chemistry. Antibacterial nanorods of CQDs-ZnO had strong antibacterial activity under visible light irradiation, and a concentration of 0.1 mg/L was able to kill more than 96% of bacteria. The photocatalytic antibacterial mechanism was also studied. CQDs-ZnO produced more than three times the free radicals than pure ZnO under visible light irradiation. These free radicals destroyed the bacterial matrix of the cell wall and released cell proteins and nucleic acids. Moreover, CQDs-ZnO showed low cytotoxicity and can be used in medical applications.

PMID:
30764959
DOI:
10.1166/jnn.2019.16320

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