Photocatalytic Performances for Mixed-phase Hierarchical Structure TiO2 Prepared by Physical Mixing†

doi:10.7503/cjcu20150287

Abstract

Abstract:

Mixed-phase hierarchical structure titania(MH-TiO₂) with different rutile contents were synthesized via physically mixing hierarchical flower-like anatase TiO₂ and rutile TiO₂ nanoparticles. The morphology, phase-structure and properties of the samples were studied via scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and UV-Vis diffused reflectance spectrometry(UV-Vis DRS). The photocatalytic activity of MH-TiO₂ for degradation of methylene blue under ultraviolet light irradiation was investigated. The results indicate that the hierarchical structure can enlarge specific surface area thus ensuring the effective adsorption of reactant and improving the utilization of light. What’s more, heterojunction structure can increase the separation efficiency of the photogenerated electrons and holes and improve the photocatalytic performances of the material.

Key words: TiO2, Mixed-phase hierarchical structure, Heterojunction, Photocatalysis

CLC Number:

O649
O643

TrendMD:

ZHANG Xiao, XIE Yingjuan, MA Peijun, WU Zhijiao, ZHAO Suling, PIAO Lingyu. Photocatalytic Performances for Mixed-phase Hierarchical Structure TiO₂ Prepared by Physical Mixing^†[J]. Chem. J. Chinese Universities, 2015, 36(10): 1977.

Figures/Tables 9

Fig.1 TEM image(A) and XRD pattern(B) of rutile TiO2 nanoparticles(R-TiO2) and SEM image(C) and XRD pattern(D) of anatase hierarchical TiO2(AH-TiO2)

Fig.2 FTIR spectra of R-TiO2(a) and AH-TiO2(b)

Fig.3 SEM(A) and TEM(B, C) images of HM-TiO2

Fig.4 XRD pattern of HM-TiO2

Fig.5 Full survey(A) and Ti2p(B) XPS spectra of HM-TiO2(a), P25(b) and AH-TiO2(c)

Fig.6 Nitrogen adsorption-desorption isotherm of HM-TiO2(A) and UV-Vis DRS(B) of HM-TiO2(a), AH-TiO2(b) and R-TiO2(c)Inset of (A): pore size distribution of HN-TiO2.

Fig.7 SEM images of the samples prepared with melamine as dispersion medium in different mixing sequence(A) Melamine mixed with AH-TiO2 at first; (B) melamine mixed with R-TiO2 at first.

Fig.8 Schematic of the formation of HM-TiO2

Fig.9 Degradation curves of MB catalyzed by P25, AH-TiO2 or HM-TiO2 with different mA/mR

References 38

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Photocatalytic Performances for Mixed-phase Hierarchical Structure TiO₂ Prepared by Physical Mixing^†

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