Crystal morphology control of synthetic giniite for enhanced photo-Fenton activity against the emerging pollutant metronidazole
Crystal morphology control of synthetic giniite for enhanced photo-Fenton activity against the emerging pollutant metronidazole
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DOI：
10.1016/j.chemosphere.2020.128300
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发表时间：
2021-01-01
期刊：
影响因子：
8.8
通讯作者：
Lanceros-Mendez, S.
中科院分区：
文献类型：
--
作者：
Martins, P. M.;Salazar, H.;Lanceros-Mendez, S.
甲硝唑（MNZ）是一种难治性抗生素，在水环境中具有毒性和致癌作用。本工作以Fe-5（FO 4）（4）（OH）（3）为中心点，分别与Li+、Na+、K+三种碱性阳离子反应，制备了具有2 H（2）O（giniite）结构的Fe-5（FO 4）（4）（OH）（3）纳米粒子，并将其作为芬顿（Fenton）催化剂用于去除MNZ。结果表明，在水热合成过程中，不同阳离子的加入促进了镁钠长石形貌的变化，从花簇状到树枝状，并保持了纯镁钠长石的晶体结构。然后通过在阳光照射下降解MNZ 9 h来评价这些颗粒的光芬顿活性。结果表明，碱性阳离子在光Fenton效率中起主导作用，表现为Na@giniite颗粒的上级降解效率（在giniite浓度为0.2 g L-1和0.07 g L-1时分别为91.2%和72.5%），这与其高表面积（10.7 m2 g-1）有关。因此，证明了钠镁石颗粒作为用于从水中去除MNZ的芬顿催化剂的适用性。(C)2020爱思唯尔有限公司版权所有。
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.