[Fabrication of Co3O4 nanorods and its catalytic oxidation of gaseous toluene].

Co3O4 nanorods were fabricated by the low-temperature hydrothermal method. The Co3O4 nanorods were formed through adding a small amount of surfactants (Polyvinylpyrrolidone, referred to as PVP) and reacting at 95 degrees C. Controlling the reaction time of preparation and pH of the solution can affect the properties of Co3O4 nanorods. X-ray diffraction (XRD), transmission electron microscopy (TEM) proved the as-prepared samples were Co3O4 nanorods in cubic phase. Hydrogen temperature programmed reduction (H2-TPR) and nitrogen adsorption-desorption experiment results showed that the size and pore structure of Co3O4 nanorods could be affected by different reaction time and pH, and led to the difference in specific surface area. The catalytic properties of Co3O4 nanorods were examined by degradation of gaseous toluene. The results showed that conversion of toluene was affected under low temperature by Co3O4 nanorods, which were prepared by different reaction time and pH. When the temperature was below 260 degrees C, the catalyst prepared in alkaline condition had the highest activity. However, when the temperature was higher than 260 degrees C, the conversion of toluene was hot significantly different.

[Preparation, characterization of Si doped TiO2 nanotubes and its application in photocatalytic oxidation of VOCs].

The Si-doped TiO2 nanotubes photocatalysts was synthesized by anodic oxidation method, which used Na2SiF6/HF as an electrolyte, and was characterized by means of SEM, XRD, DRS and EDX. TiO2 nanotubes composed of anatase phase and rutile phase, and Si was highly dispersed on the wall of TiO2 nanotubes. The photocatalytic activity of the Si-doped TiO2 nanotubes was investigated for photocatalytic degradation of gaseous toluene. It was found that the photocatalytic activity of Si-doped TiO2 nanotubes, which prepared by 0.03 mol x L x (-1) Na2SiF6/HF and calcined at 400 degrees C for 1 h, was the highest. The conversion of toluene was 60% over the prepared Si doped TiO2 nanotubes under UV light, which was one times higher than that of pure TiO2 nanotubes.