Effect of rGO content on enhanced Photo-Fenton degradation of Venlafaxine using rGO encapsulated magnetic hexagonal FeTiO3 nanosheets
Effect of rGO content on enhanced Photo-Fenton degradation of Venlafaxine using rGO encapsulated magnetic hexagonal FeTiO3 nanosheets
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DOI：
10.1016/j.cej.2023.147319
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发表时间：
2023-11
影响因子：
15.1
通讯作者：
Da Wang;S. Giannakis;Jingyu Tang;Kai Luo;Juntao Tang;Zhiqiao He;Shuang Song;Lizhang Wang-
中科院分区：
文献类型：
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作者：
Da Wang;S. Giannakis;Jingyu Tang;Kai Luo;Juntao Tang;Zhiqiao He;Shuang Song;Lizhang Wang-
在这项工作中，我们合成了磁性还原氧化石墨烯（rGO）封装的六方FeTiO 3（FTO@rGO）纳米片与rGO负载量为0，1，5和10重量%，与主要目标有效地降解文拉法辛（VLF）通过光芬顿过程在宽pH值范围3-11。确定了钛铁矿FeTiO 3（FTO）固有的可见光光催化能力和铁位在光Fenton过程中对H2 O2的催化活化作用。通过对rGO的策略整合，所有FTO@rGO催化剂在光Fenton实验中均表现出比FTO更高的VLF降解率，其中rGO负载量为5wt%的FTO@rGO催化剂表现出最高的VLF降解率（90 min时100%VLF降解），这归因于光生电子的加速迁移和有效的Fe 2 +/Fe 3+循环。此外，封装的rGO显着减轻整个反应pH范围内的Fe浸出，指导H2 O2活化发生在FTO@rGO界面，而不是在溶液中。通过综合分析，我们鉴定了47个VLF中间产物，并根据12个代表性中间产物推断了其降解途径。降解过程主要是由羟基自由基作为主要的活性氧物种驱动的，由超氧自由基，光生电子和空穴在FTO@ rGO催化的光芬顿过程中的贡献补充。该研究不仅拓展了钛铁矿在高级氧化工艺（AOPs）领域的应用，而且为金属氧化物/碳质异质结构催化剂的开发提供了有价值的见解。
In this work, we synthesized magnetic reduced graphene oxide (rGO) encapsulated hexagonal FeTiO3(FTO@rGO) nanosheets with rGO loading amount of 0, 1, 5 and 10 wt%, with a primary objective of efficiently degrading venlafaxine (VLF) through photo-Fenton processes across a wide pH range of 3–11. The inherent visible-light photocatalytic ability of ilmenite FeTiO3(FTO) and catalytic activation of H2O2by Fe sites during the photo-Fenton process were established. Through the strategic integration of rGO, all FTO@rGO catalysts show higher VLF degradation rate than FTO in photo-Fenton evolution experiments and the FTO@rGO catalysts with rGO loading amount of 5 wt% presents the highest VLF degradation rate (100 % VLF degradation at 90 min), which attributed to the accelerated migration of photo-generated electrons and the efficient Fe2+/Fe3+cycle. Furthermore, the encapsulation of rGO significantly mitigated Fe leaching throughout the reaction pH range, directing H2O2activation to occur at the FTO@rGO interface instead of in solution. Through a comprehensive analysis, we identified 47 intermediate products of VLF and deduced the degradation pathway based on 12 representative intermediates. The degradation process was primarily driven by hydroxyl radicals as the dominant reactive oxygen species, complemented by the contribution of superoxide radicals, photogenerated electrons, and holes during the FTO@rGO-catalyzed photo-Fenton process. This study not only expands the application of ilmenite in the realm of advanced oxidation processes (AOPs) but also provides valuable insights for the future exploration and development of metal oxide/carbonaceous heterostructure catalysts.