具有分级多孔结构和光催化性质的核-壳纳米球(HP-Fe2O3@TiO2)

doi:10.3866/PKU.WHXB201210291

摘要/Abstract

摘要：

通过溶剂热和溶胶-凝胶涂层法, 设计并制备了具有分级多孔结构和光催化性质的核-壳纳米球(HP-Fe₂O₃@TiO₂). 透射电子显微镜(TEM)照片证明所得HP-Fe₂O₃@TiO₂样品具备分级多孔结构, 这是因为HP-Fe₂O₃@TiO₂的内核-Fe₂O₃具有大孔空隙, 同时外壳-TiO₂具有介孔空隙. 此外, 通过X射线衍射(XRD)、扫描电子显微镜(SEM)、高分辨透射电子显微镜(HRTEM)、X射线光电子能谱(XPS)以及氮气吸附-脱附曲线深入研究了HP-Fe₂O₃@TiO₂的结构及其性质. 分别在可见及紫外光照下, 研究了样品在H₂O₂体系下的光催化降解亚甲基蓝(MB)的性质. 所观察到的HP-Fe₂O₃@TiO₂纳米球的光催化性能, 可归因于核-壳结构的协同作用, 这进一步表明, TiO₂外壳对α-Fe₂O₃的光催化活性有重要影响作用. 在可见光照射下, HP-Fe₂O₃@TiO₂ (1 mL Ti(OC₄H₉)₄ (TBT))具有较优异的光催化活性. 同时, HP-Fe₂O₃@TiO₂ (4mL TBT)具备优异的单分散形貌, 并在紫外光照射下, 表现出最优的光催化活性.

关键词: α-Fe₂O₃, TiO₂, 核-壳纳米小球, 分级多孔结构, 光催化性质, 亚甲基蓝

Abstract:

Core-shell photocatalysts of hierarchical porous nanospheres (HP-Fe₂O₃@TiO₂) have been designed and prepared using solvothermal and sol-gel methods. Transmission electron microscopy (TEM) images confirm that the obtained samples a hierarchical porous structure, which results from both the macroporous structure of the core (Fe₂O₃) and the mesoporous structure of the shell (TiO₂). X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption-desorption isotherms were employed to characterize the structure and properties of HP-Fe₂O₃@TiO₂ nanospheres. We investigated the photocatalytic degradation (in the presence of H₂O₂) of methylene blue (MB) irradiated under visible and ultraviolet light. The observed photocatalytic performance of HP-Fe₂O₃@TiO₂ nanospheres is attributed to the synergetic effects of the core-shell structure, which indicates that the TiO₂ shell enhances the photocatalytic performance of α-Fe₂O₃. HP-Fe₂O₃@TiO₂ (1 mL Ti(OC₄H₉)₄ (TBT)) possesses the highest photodegradation reaction constant among all samples under visible light irradiation. Moreover, HP-Fe₂O₃@TiO₂ (4 mL TBT) has an optimal monodisperse morphology and achieves high photocatalytic activity under ultraviolet light irradiation.

Key words: α-Fe₂O₃, TiO₂, Core-shell nanosphere, Hierarchical porous structure, Photocatalytic property, Methylene blue

陈拂晓, 范伟强, 周腾云, 黄卫红. 具有分级多孔结构和光催化性质的核-壳纳米球(HP-Fe₂O₃@TiO₂)[J]. 物理化学学报, 2013, 29(01), 167-175. doi: 10.3866/PKU.WHXB201210291

CHEN Fu-Xiao, FAN Wei-Qiang, ZHOU Teng-Yun, HUANG Wei-Hong. Core-Shell Nanospheres (HP-Fe₂O₃@TiO₂) with Hierarchical Porous Structures and Photocatalytic Properties[J]. Acta Phys. -Chim. Sin. 2013, 29(01), 167-175. doi: 10.3866/PKU.WHXB201210291

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201210291

https://www.whxb.pku.edu.cn/CN/Y2013/V29/I01/167

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具有分级多孔结构和光催化性质的核-壳纳米球(HP-Fe₂O₃@TiO₂)

Core-Shell Nanospheres (HP-Fe₂O₃@TiO₂) with Hierarchical Porous Structures and Photocatalytic Properties

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