PREPARATION AND CHARACTERIZATION OF CHROMIUM DOPED TITANIA HOLLOW NANO-SPHERES

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RAMEZANI M.; AGHABOZORG H.R.; SAKHAIE F.

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Journal: JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY) Year:2009 | Volume:19 | Issue:72 (CHEMISTRY ISSUE) Page(s): 77-84

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Title

PREPARATION AND CHARACTERIZATION OF CHROMIUM DOPED TITANIA HOLLOW NANO-SPHERES

Author(s)

RAMEZANI M. | AGHABOZORG H.R. | SAKHAIE F. | Issue Writer Certificate

Keywords

HOLLOW NANO-SPHEREQ3

CHROMIUM DOPED TITANIAQ3

SOL-GEL METHODQ3

RUTILE AND ANATASE PHASEQ3

Abstract

Introduction: Hollow titania nanospheres have attracted much attention due to their wide applications in many fields, such as adsorption, catalysis and photocatalysis. Doping of different transition metals has enhanced photocatalytic properties of TiO2.Aim: Syntheses and characterization of Cr doped titania hollow nanospheres using SOL-GEL METHOD and without template (for the first time).Experimental: Hollow titania nanospheres synthesized by a simple SOL-GEL METHOD and calcined in different temperatures. Then the prepared samples were characterized with Xray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM).Results: The XRD patterns of samples show that the maximum mole fraction of Cr doping level in TiO2 is around 30% and the crystal lattice parameter decreases with Cr doping. Pure TiO2 and Cr doped TiO2 calcined at 500 oC both are in anatase phase but for pure TiO2 with increasing calcination temperature rutile phase starts to appear. The fraction of the rutile phase is greatly reduced for Cr doped TiO2 hollow spheres in comparison with pure TiO2 hollow spheres at 700 oC. The SEM and TEM images indicate that the prepared samples are spherical. The mean diameters of the spheres are estimated using the Scherrer equation.The size of the crystal grains of the TiO2 hollow spheres increases with increasing calcination temperature and decreases with increasing calcination time.Conclusion: The maximum mole fraction of Cr doping in hollow titania spheres is around 30%. For pure TiO2 with increasing calcination temperature rutile phase starts to appear. The fraction of the rutile phase is greatly reduced for Cr doped TiO2 hollow spheres at 700 oC. The crystal lattice parameters calculated from the XRD patterns of the prepared samples show that the crystal lattice parameter (c) of the samples decreases with Cr doping.

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APA: Copy

RAMEZANI, M., AGHABOZORG, H.R., & SAKHAIE, F.. (2009). PREPARATION AND CHARACTERIZATION OF CHROMIUM DOPED TITANIA HOLLOW NANO-SPHERES. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), 19(72 (CHEMISTRY ISSUE)), 77-84. SID. https://sid.ir/paper/70616/en

Vancouver: Copy

RAMEZANI M., AGHABOZORG H.R., SAKHAIE F.. PREPARATION AND CHARACTERIZATION OF CHROMIUM DOPED TITANIA HOLLOW NANO-SPHERES. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)[Internet]. 2009;19(72 (CHEMISTRY ISSUE)):77-84. Available from: https://sid.ir/paper/70616/en

IEEE: Copy

M. RAMEZANI, H.R. AGHABOZORG, and F. SAKHAIE, “PREPARATION AND CHARACTERIZATION OF CHROMIUM DOPED TITANIA HOLLOW NANO-SPHERES,” JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), vol. 19, no. 72 (CHEMISTRY ISSUE), pp. 77–84, 2009, [Online]. Available: https://sid.ir/paper/70616/en

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