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TiO2 supported on SiO2 photocatalysts prepared using ultrasonic-assisted sol-gel method

Yang X. L., Liu C. J., Liu Y. Q., Li X., Xu Y. H.

Materials Science Poland

2011

Vol. 29, No. 3

189--194

Guangdong TiO2-SiO2 (TiO2 supported on SiO2) photocatalysts were prepared using an ultrasonic-assisted sol-gel method. These photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and photoluminescence spectra (PL). Their photocatalytic activities were investigated by the method of methyl orange oxidation. It was found that the photocatalytic activity of TiO2-SiO2 was optimal when the molar ratio of hexadecyl trimethyl ammonium bromide to titanium butoxide was 1:10. The average crystallite size of TiO2-SiO2 was smaller than that prepared by the stirring method. Furthermore, for pure anatase phase samples, it was shown that the lower the photoluminescence intensity, the higher the photocatalytic activity.

Synthesis, Crystal Structure and Magnetic Properties of [Mn(L)2(N(CN)2)2], a One-Dimensional Systems with End to End Single Dicyanamide Bridges (L=4-Cyanopyridine N-Oxide)

Zhao Q., Liu Y. Q., Fang R.

Polish Journal of Chemistry

2004

Vol. 78 / nr 3

343-348

Anew 1-D polymeric coordination compound [Mn(L)2(N(CN)2)2] (L = 4-cyanopyridine N-oxide) has been synthesized and characterized. The crystal structure of this compound was determined by X-ray diffraction analysis. In the crystal structure, the [Mn(L)2]2+ units are linked by [N(CN)2]- _-bridging ligands to form one dimensional structure. The manganese ions display four coordination, with two terminal N atoms of different [N(CN)2]- ligands and twoOatoms of different 4-cyanopyridine N-oxide ligands. Analysis of variable temperature magnetic susceptibility (2-300 K) indicates that the polymer shows weak antiferromagnetic interaction.