Solar Energy Materials and Solar Cells, Vol.90, No.13, 1905-1914, 2006
Visible light-sensitized photocatalyst immobilized on beads by CVD in a fluidizing bed
In this work, chemical vapor deposition in a fluidized bed was employed for the immobilization of a photocatalyst on beads. By introducing carbon (TiOC), nitrogen (TiON) and iron (Fe/TiO2,) into TiO2 matrix, samples were prepared, respectively. The X-ray diffractometer pattern of TiOC revealed a mixture of the anatase and rutile crystalline forms (65% and 34%, respectively) at the reaction temperature of 600 degrees C. TiOC absorbed in the visible region and showed photocatalytic activity in terms of isopropyl alcohol (IPA) degradation under a fluorescent lamp and blue light-emitting diode. TiON exhibited a shoulder in the absorption near 520 run and was photocatalytically active under visible light at 460nm. In the case of the Fe/TiO2 species, lowering the bubbler temperature, i.e. reducing the amount of doped-iron, caused the rate of CO2 evolution to increase during IPA degradation. Among studied species, Fe/TiO2 under the condition of the bubbler temperature at 109 degrees C with a flow rate of 10cm(3)/min showed highest photocatalytic activity in IPA degradation. (c) 2005 Elsevier B.V. All rights reserved.
Keywords:photocatalyst;immobilized;CVD;visible light sensitized;nitrogen-doped;carbon-doped;iron-doped