Centre/Department of Physics, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal; Centre/Department of Chemistry, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal; IB-S - Institute for Research and Innovation on Bio-Sustainability, University of Minho, 4710-057, Braga, Portugal.
Centre/Department of Physics, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal; Centre/Department of Chemistry, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal; IB-S - Institute for Research and Innovation on Bio-Sustainability, University of Minho, 4710-057, Braga, Portugal.
Chemosphere. 2021 Jan;262:128300. doi: 10.1016/j.chemosphere.2020.128300. Epub 2020 Sep 11.
Metronidazole (MNZ) is a recalcitrant antibiotic with toxic and carcinogenic effects in aquatic environments. In this work, Fe(PO)(OH)·2HO (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 and 0.07 g L, respectively), related with its high surface area (10.7 m g). Thus, it is demonstrated the suitability of Na@giniite particles as Fenton catalyst for MNZ removal from water.
甲硝唑（MNZ）是一种抗药性抗生素，在水生环境中具有毒性和致癌作用。在这项工作中，合成了具有三种不同碱性阳离子（Li、Na 和 K）的 Fe(PO)(OH)·2HO（giniite）颗粒，并将其用作芬顿催化剂去除 MNZ。结果表明，在水热合成过程中添加不同的阳离子会促进从星状到花状和树枝状的不同形态的形成，同时保持纯 giniite 的晶体结构。然后通过在阳光辐射下 9 小时降解 MNZ 来评估这些颗粒的光芬顿活性。结果表明，碱性阳离子在光芬顿效率中起主要作用，这可以通过 Na@giniite 颗粒的优异降解效率（giniite 浓度分别为 0.2 g/L 和 0.07 g/L 时，降解效率分别为 91.2%和 72.5%）来证明，这与它的高表面积（10.7 m²/g）有关。因此，证明了 Na@giniite 颗粒作为芬顿催化剂用于从水中去除 MNZ 的适用性。
