Suchergebnisse

Metronidazole (MNZ) is a recalcitrant antibiotic with toxic and carcinogenic effects in aquatic environments. In this work, Fe-5(FO4)(4)(OH)(3)center dot 2H(2)O (giniite) particles were synthesised with three different alkaline cations (Li+, Na+ and K+) and used as Fenton catalysts for MNZ removal. It is shown that the addition of different cations during the hydrothermal synthesis process promote different morphologies from asterisk-like to flower-like and branches-like, maintaining the crystalline structure of pure giniite. The photo-Fenton activity of these particles was then evaluated through the degradation of MNZ under sunlight radiation for 9 h. The results indicate that the alkaline cation has a predominant role in the photo-Fenton efficiency, as demonstrated by the superior degradation efficiencies of Na@giniite particles (91.2% and 72.5% with giniite concentration of 0.2 g L-1 and 0.07 g L-1, respectively), related with its high surface area (10.7 m(2) g(-1)). Thus, it is demonstrated the suitability of Na@giniite particles as Fenton catalyst for MNZ removal from water. (C) 2020 Elsevier Ltd. All rights reserved. ; This work was supported by the Portuguese Foundation for Science and Technology (FCT) in the framework of the Strategic Funding UID/FIS/04650/2020 and PEST-C/QUI/UIO686/2014 and under projects PTDC/BTM-MAT/28237/2017 and PTDC/FIS-MAC/28157/2017. We also thank the financial support from e FCT for grants SFRH/BD/122373/2016 (HS), SFRH/BPD/112547/2015 (CMC), IF/01516/2013 (SF), CTTI-70/19-CF(1) (P.M), and CEECIND/00833/2017 (RG). The authors thank funding by the Spanish State Research Agency (AEI) and the European Regional Development Fund (ERFD) through the project PID2019-106099RB-C43/AEI/10.13039/501100011033 and from the Basque Government Industry and Education Department under the ELKARTEK, HAZITEK and PIBA (PIBA-2018-06) programs, ...