Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (01): 167-175.doi: 10.3866/PKU.WHXB201210291

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

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

CHEN Fu-Xiao1, FAN Wei-Qiang2, ZHOU Teng-Yun2, HUANG Wei-Hong1   

  1. 1 School of The Environment, Jiangsu University, Zhenjiang 212013, Jiangsu Province, P. R. China;
    2 School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu Province, P. R. China
  • Received:2012-09-16 Revised:2012-10-29 Published:2012-12-14
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21201085), Natural Science Foundation of Jiangsu Province, China (BK2012294), and Jiangsu University College Student Scientific Research Project, China (Y11A018).

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