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.

Advanced Multifunctional Corrosion Protective Coating Systems for Light-Weight Aircraft Alloys—Actual Trends and Challenges

“…Nevertheless, the approach of involvement of TiO 2 with incorporated photoabsorbers should be applied very attentively because the TiO 2 particles possess photodecomposition activity [36][37][38][39], and the organic UV light absorbers can terminate the polymerization processes of the basic coating layer matrix synthesis. Consequently, the elaboration of such coating compositions by addition of TiO 2 particles loaded by photoabsorbers should be combined by systematic comparative investigations with long-term UV-illumination, to detect whatever incompatibility effects on the basic polymer matrix.…”

Estudo teórico da adsorção de COVs aromáticos em dióxido de titânio e zircônio

“…Dentre os materiais utilizados para esse fim, os dióxidos de titânio (TiO 2 ) e zircônio (ZrO 2 ) são nanomateriais promissores que podem ser usados na remediação da qualidade do ar. [23][24][25][26][27][28][29] O TiO 2 apresenta estruturas cristalinas de rutilo, anatásio e brookita, com os seus nanomateriais sendo utilizados em tintas, proteção ultravioleta, como sensores, na catálise, dentre outras aplicações. [30][31][32][33] O ZrO 2 possui estrutura cristalina cúbica, tetragonal e monoclínica, apresentando uma variedade de aplicações, tais como em tecnologias de células combustíveis, catalisadores e em preparações piezoelétricas, optoeletrônicas e dielétricas.…”