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UVB pre-irradiation of titanium dioxide nanoparticles is more detrimental to freshwater algae than UVA pre-irradiation
Published in Elsevier Ltd
2020
Volume: 8
   
Issue: 5
Abstract
Continued use of P25 TiO2 NPs in several fields necessitates their toxicity evaluation towards the ecosystem. Considering the high photocatalytic activity of TiO2 NPs, they were selected in the current study. The photocatalytic potential and toxicity of NPs on freshwater algae Chlorella sp. were compared upon UVA pre-irradiation and UVB pre-irradiation. Low concentrations (1.56, 3.13, and 6.26 μM) of NPs used for the study correlate well with the available environmental concentrations. The mean hydrodynamic diameter (MHD) for UVB pre-irradiated NPs (159.34 ± 0.68 nm) was the least when compared with UVA pre-irradiated (179.99 ± 0.85 nm) and non-irradiated NPs (220.04 ± 6.05 nm). This decrease in MHD denoted lesser agglomeration of NPs upon UVB pre-irradiation. For all the tested concentrations, the cell viability was less for UVB pre-irradiated NP-treated algae when compared to UVA pre-irradiated NP-treated algae (p < 0.001). Extracellular ROS generation was significantly higher for UVB pre-irradiated NPs (p < 0.001) as compared to UVA pre-irradiation. The enhanced toxicity of UVB pre-irradiated NPs was accompanied by increased generation of intracellular ROS, which in turn increased the SOD, CAT, and APX enzyme activities. This study concludes that UVB pre-irradiation of P25 TiO2 NPs caused more harm to freshwater algae through oxidative stress when compared to UVA pre-irradiation. © 2020 Elsevier Ltd.
About the journal
JournalData powered by TypesetJournal of Environmental Chemical Engineering
PublisherData powered by TypesetElsevier Ltd
ISSN22133437
Open AccessNo
Authors (3)