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Hao S.,Zhejiang Normal University | Zhang J.,Zhengjinag Normal University | Sun S.,Zhengjinag Normal University | Shangguan D.,Zhengjinag Normal University
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2012

Using cetyltrimethylammonium bromide (CTAB) as template and tetraethyl orthosilicate (TEOS) as the silica source, the high ordered mesoporous MCM-48 was synthesized in this study. The MCM-48 with different Ce content (Ce-MCM-48s) were prepared by adding MCM-48 into mixture of Ce(NO 3) 3·6H 2O and ethanol. The Ce-MCM-48s were characterized by low-angle X-ray diffraction (XRD), N 2 adsorption-desorption technique, FT-IR, transmission electron microscopy (TEM), X-ray photoelectron spectrum (XPS), and UV-vis spectrum. The XRD, N 2 adsorption-desorption technique, and TEM showed that the Ce-MCM-48s had high similarity to the cubic Ia3d symmetry of MCM-48. The results of FT-IR and XPS confirmed that the surface and inside of MCM-48 were occupied by cerium oxides. The photocatalytic degradation of Rhodamine B under visible light illumination showed that the activity of mesoporous 10%Ce-MCM-48 in dye decolorization was higher than those of pure CeO 2 sample, P25 and other Ce-MCM-48s under the same conditions.

Hao S.,Zhejiang Normal University | Hou J.,Zhengjinag Normal University
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2014

Using P123, tetraethoxysilane (TEOS) as template and silicon source, SBA-15 mesoporous materials were synthesized under acidic synthetic condition. Using SBA-15 mesoporous materials, different content of La(NO3)3/Pr(NO3)3 and Ce(NO3)3 as hard template and precursors, La-Pr-O/Ce-Pr-O and SiO2 compound was prepared by calcination. After removal of SiO2 in the mixture using sodium hydroxide solution (2 mol·L-1), La-Pr-O/Ce-Pr-O composite oxide was obtained. The prepared materials were characterized by X-ray diffraction (XRD), laser Raman spectrometer (Raman), N2 adsorption-desorption method, ultraviolet-visible absorption spectrometer (UV-Vis) and transmission electron microscope (TEM). The results of Raman and XRD proved that the structure of La-Pr-O/Ce-Pr-O was similar to CaF2. The N2 adsorption-desorption showed that the mesoporous structure obtained in Ce-La-O/Ce-Pr-O materials. The UV-Vis exhibited that the absorption of Uv-Vis, especially the visible light, increased remarkably with increasing the content of Pr in the Ce-Pr-O, while the visible light absorption of Ce-La-O remained stable with increasing of La content.

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