Boosting photoassisted activity for catalytic oxidation of benzoic acid and reduction of 4-nitrophenol with Ag-supported Fe3O4 aerogel
Boosting photoassisted activity for catalytic oxidation of benzoic acid and reduction of 4-nitrophenol with Ag-supported Fe3O4 aerogel
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DOI：
10.1016/j.cej.2020.126641
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发表时间：
2021-02
影响因子：
15.1
通讯作者：
Lin Lo;Zhenya Yang;Ying-Chan Hung;P. Tseng;Mikihiro Nomura;Yi-Feng Lin;Chechia Hu
中科院分区：
文献类型：
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作者：
Lin Lo;Zhenya Yang;Ying-Chan Hung;P. Tseng;Mikihiro Nomura;Yi-Feng Lin;Chechia Hu
本研究采用溶胶-凝胶法和超临界冷冻法制备了Fe3O4基气凝胶，在负载银的情况下，制备的材料对苯甲酸和对氨基苯酚的脱除和还原分别表现出了较高的可见光辅助Fenton氧化和还原活性。研究了载银Fe3O4基气凝胶的光催化辅助反应机理。所提出的机理表明，光生空穴和电子分别在氧化和还原过程中涉及的羟基自由基的产生中起重要作用。这种高效的光辅助氧化和还原可以归因于Fe3O4基气凝胶独特的介孔结构和Ag的负载量，它提供了高比表面积、丰富的活性中心和更多的活性基团。此外，Fe3O4基气凝胶的铁磁性使其具有可回收和可重复使用的特性。基于载银Fe3O4基气凝胶在光辅助氧化和还原方面的高活性，本工作为设计高效的环境修复气凝胶催化剂提供了新的见解。
In this study, a Fe3O4-based aerogel was successfully prepared using a sol-gel method followed by supercritical freezing; upon Ag loading, the prepared material exhibited high visible light-assisted Fenton-oxidation and reduction activities for benzoic acid removal and 4-aminophenol production, respectively. The photocatalytic-assisted reaction mechanisms of the Ag-loaded Fe3O4-based aerogel were investigated. The proposed mechanisms showed that photogenerated holes and electrons play important roles in the generation of hydroxyl radicals involved in the oxidation and reduction processes, respectively. The highly efficient light-assisted oxidation and reduction could be attributed to the unique mesoporous structure of the Fe3O4-based aerogel and to the Ag loading, which provides a high specific surface area, abundant active sites, and increased amounts of active radicals. In addition, the ferromagnetism of the Fe3O4-based aerogel endows it with recyclability and reusability. Based on the high activity of the Ag-loaded Fe3O4-based aerogel for light-assisted oxidation and reduction, this work provides new insights into the design of an efficient aerogel catalyst for environmental remediation.