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Fe3+-doped ordered mesoporous γ-Fe2O3/SiO2 microspheres as a highly efficient magnetically separable heterogeneous Fenton catalyst
Microporous and Mesoporous Materials ( IF 5.2 ) Pub Date : 2021-08-17 , DOI: 10.1016/j.micromeso.2021.111373
Nassira Ferroudj 1, 2 , Patricia Beaunier 3 , Anne Davidson 3 , Sébastien Abramson 2
Affiliation  

Here, several γ-Fe2O3/SiO2 nanocomposite microspheres were synthesized, characterized and tested as magnetically separable heterogeneous catalysts in an advanced oxidation process. A strong relation between the structure and the activity of these materials was evidenced. Two parameters, including the porosity of the silica support and the doping of the material with Fe3+ ions in addition to the γ-Fe2O3 nanoparticles, were investigated. The structure of the catalytic materials was determined by the use of different methods, in particular SEM, TEM, XRD, N2 physisorption, magnetometry, UV–Vis spectroscopy and XPS. The results demonstrated that the irregular microporosity of the silica framework can be replaced by an ordered mesoporosity, adding a second surfactant during the synthesis. For the mesoporous material, it was observed that the additional Fe3+ are dispersed in the mesoporous silica framework as individual cations and small clusters of Fe(III) species. The materials were tested as heterogeneous Fenton catalysts on two model aqueous pollutants, methyl orange (MO) and reactive black 5 (RB5). It was observed that the oxidation and mineralization rates of the two dyes is significantly enhanced when a doped catalytic material is used. This effect is particularly strong with the mesoporous silica support. In addition, the doped mesoporous catalyst retained its activity for a large range of conditions. These improvements were attributed to the strong activity of the additional Fe(III) species, although the presence of the mesoporosity also plays a significant role.



中文翻译:

Fe3+ 掺杂有序介孔 γ-Fe2O3/SiO2 微球作为高效磁分离多相芬顿催化剂

在这里,合成、表征和测试了几种γ-Fe 2 O 3 /SiO 2纳米复合微球作为高级氧化过程中的磁可分离多相催化剂。证明了这些材料的结构和活性之间存在很强的相关性。研究了两个参数,包括二氧化硅载体的孔隙率和材料除了 γ-Fe 2 O 3纳米颗粒之外的Fe 3+离子掺杂。催化材料的结构是通过使用不同的方法确定的,特别是SEM、TEM、XRD、N 2物理吸附、磁力测定、UV-Vis 光谱和 XPS。结果表明,二氧化硅骨架的不规则微孔可以被有序的中孔所取代,在合成过程中添加第二种表面活性剂。对于介孔材料,观察到额外的 Fe 3+分散在介孔二氧化硅骨架中作为单独的阳离子和 Fe(III) 物质的小簇。这些材料作为非均相芬顿催化剂在两种模型水性污染物甲基橙 (MO) 和活性黑 5 (RB5) 上进行了测试。据观察,当使用掺杂的催化材料时,两种染料的氧化和矿化速率显着提高。对于中孔二氧化硅载体,这种效果特别强。此外,掺杂的介孔催化剂在大范围的条件下保持其活性。这些改进归因于额外的 Fe(III) 物质的强活性,尽管介孔的存在也起着重要作用。

更新日期:2021-08-24
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