Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 408, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124890
Keywords
Biofilm; Graphitic carbon nitride; Chitosan; Visible-light-responsive Photocatalyst
Categories
Funding
- United States Department of Agriculture-National Institute of Food and Agriculture [2017-67021-26602]
- National Science Foundation [CBET-1929144]
- Cross-Disciplinary Research Fund at The George Washington University
- Air Force Office of Scientific Research (MIPR) [F4FGA08354G001]
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Photocatalysis using visible-light-responsive composites shows promise in inactivating environmental pathogens, with demonstrated broad-spectrum biofilm inhibition and eradication. The composites exhibit excellent performance in controlling pathogenic biofilms and inhibiting biofilm development from multiple bacterial species, providing insights into the mechanism of photocatalytic reaction with microbiological systems.
Photocatalysis holds promise for inactivating environmental pathogens. Visible-light-responsive composites of carbon-doped graphitic carbon nitride and chitosan with high reactivity and processability were fabricated, and they can control pathogenic biofilms for environmental, food, biomedical, and building applications. The broadspectrum biofilm inhibition and eradication of the photocatalytic composites against Staphylococcus epidermidis, Pseudomonas aeruginosa PAO1, and Escherichia coli O157: H7 under visible light irradiation were demonstrated. Extracellular polymeric substances in Escherichia coli O157: H7 biofilms were most resistant to photocatalytic oxidation, which led to reduced performance for biofilm removal. O-1(2) produced by the composites was believed to dominate biofilm inactivation. Moreover, the composites exhibited excellent performance for inhibiting biofilm development in urine, highlighting the promise for inactivating environmental biofilms developed from multiple bacterial species. Our study provides fundamental insights into the development of new photocatalytic composites, and elucidates the mechanism of how the photocatalyst reacts with a microbiological system.
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