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Daylight induced antibacterial activity of gadolinium oxide, samarium oxide and erbium oxide nanoparticles and their aquatic toxicity

The present article describes a method of the preparation of three dilanthanide trioxides (Lx2O3): gadolinium oxide (Gd2O3), samarium oxide (Sm2O3) and erbium oxide (Er2O3) in a shape of nanoparticles. Thermal decomposition of a transient complex formed in situ from Lx(NO3)3·H2O and glycine was stud...

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Bibliographic Details
Published in:Materials chemistry and physics 2017-08, Vol.197, p.226-235
Main Authors: Dědková, K., Kuzníková, Ľ., Pavelek, L., Matějová, K., Kupková, J., Čech Barabaszová, K., Váňa, R., Burda, J., Vlček, J., Cvejn, D., Kukutschová, J.
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Language:English
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Summary:The present article describes a method of the preparation of three dilanthanide trioxides (Lx2O3): gadolinium oxide (Gd2O3), samarium oxide (Sm2O3) and erbium oxide (Er2O3) in a shape of nanoparticles. Thermal decomposition of a transient complex formed in situ from Lx(NO3)3·H2O and glycine was studied using TG/DTA analysis. The resulting 10 (Gd2O3, Er2O3) to 11 nm (Sm2O3) nanoparticles grouped into 8 μm agglomerates were characterized by X-ray powder diffraction analysis, the particle size (PS) and particle size distribution (PSD) analysis. Morphology of the nanoparticles was examined by scanning and transmission electron microscopy. The antibacterial activity against four common human pathogens (Staphylococcus aureus, Enterococcus faecalis, Escherichia coli, Pseudomonas aeruginosa) was determined both in dark conditions and on daylight was investigated revealing a phototoxic phenomenon. The lowest determined MICs were as low as 5.6 mg ml−1 against Escherichia coli and Pseudomonas aeruginosa. Moreover, acute aquatic toxicity tests of prepared nanoparticles were driven revealing the moderate toxicities against Desmodesmus subspicatus peaking with EC50 = 0.47 g dm−3 (Er2O3 nanoparticles). [Display omitted] •General inexpensive protocol of creation Lx2O3 nanoparticles was developed.•Gd2O3 (10 nm), Sm2O3 (11 nm) and Er2O3 (10 nm) were successfully prepared.•Antibacterial properties in the dark and in daylight were observed.•Aquatic toxicity assay displayed that Er2O3 the most toxic from tested nanoparticles.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2017.05.039