Preparation and Visible-light Photocatalytic Activity of Cr-TiO2 Microspheres with Reactive (001) Facet†

doi:10.7503/cjcu20140599

Abstract

Abstract:

Cr-doped TiO₂(Cr-TiO₂) microspheres with a high percentage of exposed (001) facet were prepared by a one-step hydrothermal treatment. The morphology, crystal structure and photo-absorption property of the obtained samples were characterized by field emission scanning electron microscopy(FESEM), transmission electron microscopy(TEM), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS), etc. The results demonstrated that Cr³⁺ ion and CrO₃ cluster coexisted in the catalysts. Cr³⁺ was incorporated into the crystal lattice of anatase TiO₂, which resulted in the Cr³⁺→Ti⁴⁺ charge transfer so that Cr-TiO₂ had strong absorption in the visible region. The corrosive effect of generated HF was weakened by doping small amount of Cr, which benefited for the formation of smooth exposed (001) facets in the Cr-TiO₂ samples. The visible-light-driven photocatalytic properties of the samples were studied by the degradation of Acid Red 88 dye. The Cr-TiO₂ microsphere with high exposure of (001) facet exhibited much higher efficiency than the traditional Cr-TiO₂ without exposed (001) facet. Such doped TiO₂ catalysts with definite surface micro-structure will be helpful for preparing TiO₂-based photocatalysts suitable for practical applications.

Key words: (001) Facet, Cr-doped TiO2, Heterogeneous photocatalysis, Hydrothermal synthesis

CLC Number:

O644

TrendMD:

YUAN Xia, GAO Bifen, WAN Jianfeng, LIN Bizhou, CHEN Yilin. Preparation and Visible-light Photocatalytic Activity of Cr-TiO₂ Microspheres with Reactive (001) Facet^†[J]. Chem. J. Chinese Universities, 2015, 36(2): 355.

Figures/Tables 5

Fig.1 SEM(A—E) and TEM(F) images of the Cr-TiO2 samples (A) Pure TiO2; (B) 0.5%Cr-TiO2; (C) 1%Cr-TiO2; (D, F) 2%Cr-TiO2; (E) 5%Cr-TiO2; insets in (F) are HRTEM image(down) and SAED pattern(up) of the nanoflake on the surface of Cr-TiO2 microspheres.

Fig.2 XRD patterns of TiO2 and Cr-TiO2(A) and the enlarged patterns of the (101) diffraction peak(B) a. Pure TiO2; b. 0.5%Cr-TiO2; c. 1%Cr-TiO2; d. 2%Cr-TiO2; e. 5%Cr-TiO2.

Fig.3 XPS spectra of Ti2p(A) and Cr2p(B) a. 1%Cr-TiO2; b. 2%Cr-TiO2; c. 5%Cr-TiO2; d. TiO2.

Fig.4 UV-Vis diffuse reflectance spectra of TiO2 and Cr-TiO a. Pure TiO2; b. 0.5%Cr-TiO2; c. 1%Cr-TiO2; d. 2%Cr-TiO2; e. 5%Cr-TiO2.

Fig.5 Photodegradation of Acid Red dye(A) and specific photicatalytic activity of the 2%Cr-TiO2 microsphere with high exposure of (001) facet(RF=4) and the traditional 2%Cr-TiO2 without exposed (001) facet(RF=0)(B) (A) a. BiVO4; b. 0.5%Cr-TiO2; c. 1%Cr-TiO2; d. 2%Cr-TiO2; e. 5%Cr-TiO2.

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Preparation and Visible-light Photocatalytic Activity of Cr-TiO₂ Microspheres with Reactive (001) Facet^†

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