title: Photodecomposition of volatile organic compounds using TiO2 nanoparticles.
abstract: This study examined the photodecomposition of volatile organic compounds (VOCs) using TiO2 catalyst fabricated by the Submerged Arc Nanoparticle Synthesis System (SANSS). TiO2 catalyst was employed to decompose volatile organic compounds and compare with Degussa-P25 TiO2 in terms of decomposition efficiency. In the electric discharge manufacturing process, a Ti bar, applied as the electrode, was melted and vaporized under high temperature. The vaporized Ti powders were then rapidly quenched under low-temperature and low-pressure conditions in deionized water, thus nucleating and forming nanocrystalline powders uniformly dispersed in the base solvent. The average diameter of the TiO2 nanoparticles was 20 nm. X-ray diffraction analysis confirmed that the nanoparticles in the deionized water were Anatase type TiO2. It was found that gaseous toluene exposed to UV irradiation produced intermediates that were even harder to decompose. After 60-min photocomposition, Degussa-P25 TiO2 reduced the concentration of gaseous toluene to 8.18% while the concentration after decomposition by SANSS TiO2 catalyst dropped to 0.35%. Under UV irradiation at 253.7 +/- 184.9 nm, TiO2 prepared by SANSS can produce strong chemical debonding energy, thus showing great efficiency, superior to that of Degussa-P25 TiO2, in decomposing gaseous toluene and its intermediates.
authors.affiliation: Department of Air-Conditioning and Refrigeration Engineering, National Taipei University of Technology, Taipei 106, Taiwan, ROC.
authors.forename: Ching-Song
authors.initials: CS
authors.lastname: Jwo
authors.forename: Ho
authors.initials: H
authors.lastname: Chang
authors.forename: Mu-Jnug
authors.initials: MJ
authors.lastname: Kao
authors.forename: Chi-Hsiang
authors.initials: CH
authors.lastname: Lin
mesh_terms: D003460:Crystallization / Q000379:methods; D008027:Light; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D009930:Organic Chemicals / Q000737:chemistry* / Q000528:radiation effects*; D010316:Particle Size; D010777:Photochemistry / Q000379:methods*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014835:Volatilization / Q000528:radiation effects
chemical_list: D046911:Macromolecular Substances; D009930:Organic Chemicals; C009495:titanium dioxide; D014025:Titanium