Informace o publikaci

Iron(II,III)-Polyphenol Complex Nanoparticles Derived from Green Tea with Remarkable Ecotoxicological Impact

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MARKOVA Zdenka NOVAK Petr KASLIK Josef PLACHTOVÁ Pavla BRÁZDOVÁ Markéta JANČULA Daniel MACHALOVA SISKOVA Karolina MACHALA Libor MARŠÁLEK Blahoslav ZBORIL Radek VARMA Rajender

Rok publikování 2014
Druh Článek v odborném periodiku
Časopis / Zdroj ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www http://pubs.acs.org/doi/abs/10.1021/sc5001435
Doi http://dx.doi.org/10.1021/sc5001435
Obor Znečištění a kontrola vody
Klíčová slova VALENT IRON NANOPARTICLES; IRON(III) OXIDE; LEAF EXTRACTS; FE; CYANOBACTERIA; DEGRADATION; REMEDIATION; PALLADIUM; TOXICITY; REMOVAL
Popis There are several green methods available to synthesize iron-based nanoparticles using different bio-based reducing agents. Although their useful properties in degradation of organic dyes, chlorinated organics, or arsenic have been described earlier, their characterization has been ambiguous, and further research is needed in this area. Synthesis and characterization details on iron-based nanoparticles produced by green tea extract are described in detail; characterization was carried out by transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and UV-vis spectrometry followed by ecotoxicological assay. XRD and TEM analyses revealed that iron forms amorphous nanosized particles with size depending on reaction time. Moreover, low-temperature Mossbauer spectroscopy confirmed progressive reduction of Fe3+ to Fe2+ during the reaction. Finally, the iron(II,III) nanoparticles prepared by green tea extract (GT-Fe nanoparticles) were found to have negative ecotoxicological impacts on important aquatic organisms such as cyanobacterium (Synechococcus nidulans), alga (Pseudokirchneriella subcapitata), and even invertebrate organisms (Daphnia magna). The EC50 values are 6.1 +/- 0.5 (72 h), 7.4 +/- 1.6 (72 h), and 21.9 +/- 4.3 (24 h) mg of Fe per L, respectively.
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