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

Abstract

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

MSC2000:

O649

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.

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

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

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