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Volume 30 Issue 4
Apr.  2023
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文章导航 >  矿物冶金与材料学报（英文）  > 2023  >  30(4): 630-641
Fang Xu, Wanning Cao, Jinzhou Li, Songsong Zhi, Zhiyong Gao, Yuqin Jiang, Wei Li, Kai Jiang,  and Dapeng Wu, TiO2@NH2-MIL-125(Ti) composite derived from a partial-etching strategy with enhanced carriers’ transfer for the rapid photocatalytic Cr(VI) reduction, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 630-641. https://doi.org/10.1007/s12613-022-2559-4
Cite this article as:
Fang Xu, Wanning Cao, Jinzhou Li, Songsong Zhi, Zhiyong Gao, Yuqin Jiang, Wei Li, Kai Jiang,  and Dapeng Wu, TiO2@NH2-MIL-125(Ti) composite derived from a partial-etching strategy with enhanced carriers’ transfer for the rapid photocatalytic Cr(VI) reduction, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 630-641. https://doi.org/10.1007/s12613-022-2559-4
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研究论文

通过部分刻蚀策略制备具有增强载流子转移的TiO2@NH2-MIL-125(Ti)复合材料用于光催化还原Cr(VI)

  • 1)

    河南师范大学化学化工学院，精细化学品绿色制造河南省协同创新中心，绿色化学介质与反应省部共建教育部重点实验室，新乡 453007，中国

  • 2)

    河南师范大学环境学院，新乡 453007，中国

  • 通讯作者:

    姜玉钦    E-mail: jiangyuqin@htu.cn

    武大鹏    E-mail: dapengwu@htu.edu.cn

文章亮点

  • (1) 通过蒸馏水原位部分刻蚀法制备TiO2@NH2-MIL-125(Ti)纳米复合材料。
  • (2) 与原始NH2-MIL-125(Ti)和NH2-MIL-125(Ti)完全衍生的TiO2相比，TiO2@NH2-MIL-125(Ti)纳米复合材料具有更好的还原Cr(VI)性能。
  • (3) TiO2和NH2-MIL-125(Ti)之间的紧密界面有利于载流子的转移和分离。
  • 金属-有机骨架(MOFs)材料具有孔隙率高、比表面积大、晶体高度有序、结构和功能可调控等独特优势，但是由于单一MOF材料导电性差、电子-空穴复合快等缺点，严重限制了光催化性能。因此，利用MOF基复合材料在两组分间的协同作用以获得增强的光催化性能引起了研究者的广泛关注。本文采用蒸馏水原位刻蚀法制备了具有不饱和钛-氧簇、介孔结构和紧密界面的TiO2@NH2-MIL-125(Ti)纳米复合材料。X射线光电子能谱表明TiO2和NH2-MIL-125(Ti)之间具有很强的电子相互作用，证实了TiO2@NH2-MIL-125(Ti)纳米复合材料的形成。光电化学测试和热力学测试表明TiO2@NH2-MIL-125(Ti)纳米复合材料提高了异质结界面载流子的电荷分离效率，降低了载流子的转移阻力，这有利于光激发电子的转移和Cr(VI)的还原。因此，与原始NH2-MIL-125(Ti)和NH2-MIL-125(Ti)完全衍生的TiO2相比，最优的TiO2@NH2-MIL-125(Ti)纳米复合材料(MT-2)表现出良好的光催化还原Cr(VI)性能。基于自由基捕获实验和电子顺磁共振波谱测试结果，推测了TiO2@NH2-MIL-125(Ti)纳米复合材料增强光催化活性的II型机理。
    • Research Article

    TiO2@NH2-MIL-125(Ti) composite derived from a partial-etching strategy with enhanced carriers’ transfer for the rapid photocatalytic Cr(VI) reduction

    + Author Affiliations
      Abstract
    • Metal-organic frameworks (MOFs)-based composites have been widely applied as photocatalysts because of their synergistic effect between the two individual component. Herein, TiO2@NH2-MIL-125(Ti) nanocomposites which possess unsaturated titanium–oxo clusters, mesoporous structure, and intimate interface were successfully constructed via an in-situ distilled water-etched route. The X-ray photoelectron spectroscopy (XPS) measurements indicated strong electronic interaction between TiO2 and NH2-MIL-125(Ti), confirming the formation of TiO2@NH2-MIL-125(Ti) nanocomposite. Photoelectrochemical and thermodynamics measurements showed that TiO2@NH2-MIL-125(Ti) nanocomposites have improved charge separation efficient and decreased transfer resistance of the carriers within the heterojunction interfaces, which facilitates the photoexcited electrons transfer and reduction of the Cr(VI) species. Therefore, the optimal TiO2@NH2-MIL-125(Ti) nanocomposite demonstrated superior performance compared to NH2-MIL-125(Ti) and NH2-MIL-125(Ti) derived TiO2. Based on the free radical trapping experiment and electron paramagnetic resonance (EPR) measurements, a possible type-II scheme was proposed for the enhanced photocatalytic activity over the TiO2@NH2-MIL-125(Ti) nanocomposite.
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