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

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Authors

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

Year of publication 2014
Type Article in Periodical
Magazine / Source ACS SUSTAINABLE CHEMISTRY & ENGINEERING
MU Faculty or unit

Faculty of Science

Citation
Web http://pubs.acs.org/doi/abs/10.1021/sc5001435
Doi http://dx.doi.org/10.1021/sc5001435
Field Water pollution and control
Keywords VALENT IRON NANOPARTICLES; IRON(III) OXIDE; LEAF EXTRACTS; FE; CYANOBACTERIA; DEGRADATION; REMEDIATION; PALLADIUM; TOXICITY; REMOVAL
Description 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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