Fixation of Powdered TiO₂ onto Metal Substrates by Electrophoretic Deposition and Its Use for Complete Decomposition of Volatile Organic Compounds

Abstract

We are so far involved in complete decomposition of organic wastes as well as volatile organic compounds (VOC) by the use of thermally generated holes in TiO₂. In view of the practical use of the present system, fixation of TiO₂ powders onto a substrate seems to be the core technology. To realize this, we have tried in the present investigation to fix powdered TiO₂ onto SUS meshes or Ni-Cr wires by means of electrophoretic deposition. We have constructed two kinds of equipment. One is a cartridge system which includes ten pieces of the mesh disk coated with TiO₂ that are arranged vertically. The other is a “heater-built-in” system with a triple-coaxial structure equipped with Ni-Cr/Cr₂O₃/TiO₂ wires. The former is used in combination with an external furnace; whereas the latter is a stand-alone system. Both systems exhibit excellent performance to completely decompose VOC into H₂O and CO₂.