Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 413, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125318
Keywords
Ti3+ self-doped TiO2; Carbon dots; Photocatalyst; Nanocomposite; Antimicrobial
Categories
Funding
- Excellent Youth Foundation of He?nan Scientific Committee [202300410493]
- National Natural Science Foundation of China [21571160]
- Training Plan of Young Backbone Teachers in Universities of Henan Province [2020GGJS124]
- Central Publicinterest Scientific Institution Basal Research Fund [1610392020001]
Ask authors/readers for more resources
The Pd/CDs/Ti3+-TiO2 nanocomposites synthesized in this study exhibited superior photocatalyzed antibacterial activity against E. coli and five pathogenic agricultural fungi, with minimal dark cytotoxicity on HepG2 and V-79 cells. Additionally, the recycling capacity for the photodisinfective activity of the nanocomposites was found to be unchanged after five cycles. Four active species contributing to the photoinduced antimicrobial activity of the catalyst were identified as h(+), center dot O-2(-), center dot OH, and e(-).
High efficiency photocatalysts capable of disinfecting a broad-spectrum microorganisms are needed for the practical application of photodisinfection technology. Herein, we synthesized a highly efficient photodisinfection catalyst composed of Ti3+ self-doped TiO2 decorated with carbon dots (CDs) and palladium nano-photocatalyst, designated as Pd/CDs/Ti3+-TiO2, via a facile hydrothermal-calcination approach. XPS and ESR analyses were performed to verify that the composite contained Ti3+, while TEM imaging and FTIR confirmed that the samples contained CDs. The as synthesized photocatalysts, particularly the 1% Pd/CDs/Ti3+-TiO2 sample, exhibited superior photocatalyzed antibacterial activity to pure TiO2 against E. coli (similar to 6.5 orders of magnitude increase at 30 min). The 1% Pd/CDs/Ti3+-TiO2 photocatalyst also exhibited efficient photodisinfection of five pathogenic agricultural fungi. The dark cytotoxicity of the 1% Pd/CDs/Ti3+-TiO2 nanocomposites was evaluated on HepG2 and Chinese hamster lung (V-79) cells via Cell Counting Kit-8 (CCK-8) and found to be minimal. Lastly, the recycling capacity for the photodisinfective activity of the nanocomposites was evaluated and found to be unchanged after five cycles. Four active species were identified as contributing to the photoinduced antimicrobial activity of the catalyst: h(+), center dot O-2(-), center dot OH, and e(-). Together, our results indicate that Pd/CDs/Ti3+-TiO2 nanocomposites have great potential in agricultural plant pathogen disinfection.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available