High-valent iron (Fe(VI), Fe(V), and Fe(IV)) species in water: characterization and oxidative transformation of estrogenic hormones

0464111 - BÚ 2017 RIV GB eng J - Článek v odborném periodiku
Machalová-Šišková, K. - Jančula, Daniel - Drahoš, B. - Machala, L. - Babica, Pavel - Godoy Alonso, Paula - Trávníček, Z. - Tuček, J. - Maršálek, Blahoslav - Sharma, V. K. - Zbořil, R.
High-valent iron (Fe(VI), Fe(V), and Fe(IV)) species in water: characterization and oxidative transformation of estrogenic hormones.
Physical Chemistry Chemical Physics. Roč. 18, č. 28 (2016), s. 18802-18810. ISSN 1463-9076. E-ISSN 1463-9084
Grant CEP: GA MPO FR-TI3/196
Institucionální podpora: RVO:67985939
Klíčová slova: high-valent iron species * estrogenic hormones * oxidative transformation
Kód oboru RIV: DJ - Znečištění a kontrola vody
Impakt faktor: 4.123, rok: 2016

This paper presents solid state synthesis and characterization of tetra-oxy iron(IV) and iron(V) species in their salt forms (Na4FeO4-Fe-IV and K3FeO4-Fe-V). Stability of the synthesized salts, commonly called ferrates, in water was determined by applying the Fe-57 Mossbauer spectroscopy technique. Within 2 s in water, Fe-IV converted into Fe-III while Fe-V transformed into Fe-VI and Fe-III at pH = 8.2. Comparatively, Fe-VI (bought as K2FeO4) remained stable in aqueous solution during the short time period. The oxidative removal efficiency of the high-valent iron species was then tested against five environmentally important estrogenic hormones (estron (E1), 17-beta-estradiol (E2), estriol (E3), 17-alpha-ethinylestradiol (EE2), and diethylstibestrol (DES)) in effluent water of a wastewater treatment plant. Three dosages of iron species (1, 10, and 100 mg L-1) were applied to the effluent water. An increase in the concentration of dosages enhanced the removal of estrogens. Both Fe-V and Fe-VI were effective in degrading estrogens, but Fe-IV showed limited oxidation capacity to transform estrogens. The oxidized products of the estrogens were analyzed using Raman spectroscopy and high-performance liquid chromatography-mass spectrometry (HPLC-MS) techniques. Results demonstrated the transformation of estrogens into low molecular weight oxygenated compounds such as quinone-like and opened-aromatic ring species. A detailed study on E1 by using excess Fe-VI showed the mineralization of the parent compound. The results demonstrate great potential of high-valent iron species in the degradation of endocrine disruptor chemicals like estrogens with several superior aspects including fast reactions, complete degradation and/or formation of benign organic species, and environmentally-acceptable iron oxide by-products.
Trvalý link: http://hdl.handle.net/11104/0264992