Environmental Hazard Potential of Nano-Photocatalysts Determined by Nano-Bio Interactions and Exposure Conditions.
Small
; 16(21): e1907690, 2020 05.
Article
em En
| MEDLINE
| ID: mdl-32191389
ABSTRACT
Nano-photocatalysts are known for their ability to degrade pollutants or perform water splitting catalyzed by light. Being the key functional ingredients of current and future products, the potential of nano-photocatalysts releasing into the environment and causing unintended harm to living organisms warrants investigation. Risk assessment of these materials serves as an important step to allow safe implementation and to avoid irrational fear. Using TiO2 and g-C3 N4 as representative nano-photocatalysts, this study evaluates their hazard potential in zebrafish. Under simulated solar light, nano-photocatalysts up to 100 mg L-1 show no acute toxicity to zebrafish embryos due to the protection of chorions. The short-lived reactive oxygen species generated by nano-photocatalysts only exert injury to the hatched larvae at and above 50 mg L-1 . The input of solar energy, determined by the depth of water, irradiation time, and light intensity, greatly influences the toxicity outcome. Increasing concentrations of natural organic matters contribute positively to the hazard potential at 0-10 mg L-1 while gradually diminishing the hazardous effect above 10 mg L-1 . This study demonstrates the importance of nano-bio interactions and environmental exposure conditions in determining the safety profile of nano-photocatalysts.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Peixe-Zebra
/
Exposição Ambiental
Tipo de estudo:
Risk_factors_studies
Limite:
Animals
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article