Photocatalytic degradation of gaseous trichloroethylene on porous titanium dioxide pellets modified with copper(II) under visible light irradiation
| Autor: | Keigo Tashiro, Suzuko Yamazaki, Toshifumi Tanimura |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Trichloroethylene
General Chemical Engineering Pellets General Physics and Astronomy chemistry.chemical_element Pentachloroethane 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Oxygen 0104 chemical sciences law.invention chemistry.chemical_compound chemistry law Carbon dioxide Photocatalysis Chlorine Calcination 0210 nano-technology Nuclear chemistry |
| Zdroj: | Journal of Photochemistry and Photobiology A: Chemistry. 377:228-235 |
| ISSN: | 1010-6030 |
| DOI: | 10.1016/j.jphotochem.2019.03.037 |
| Popis: | Porous titanium dioxide pellets modified with copper(II) ion (Cu-TiO2) were synthesized by sol-gel method with dialysis for photocatalytic degradation of gaseous trichloroethylene (TCE) under visible light (VL) irradiation. TCE was completely degraded by passing the gas stream (mole fractions of oxygen and TCE were 0.2 and 1.75 × 10−4, respectively) at the flow rate of 25 mL min−1 through 0.2 g of the Cu-TiO2 pellets (Cu content: 0.1 atom%) calcined at 200 °C. TCE was converted mainly to carbon dioxide, dichloroacetic acid (DCAA), and inorganic chlorine species. Relatively small quantities of pentachloroethane (PCA) and trichloroacetaldehyde (TCAH) were detected as products on the Cu-TiO2 surface. Comparison with porous TiO2 pellets under ultraviolet irradiation revealed that more chlorinated products and less carbon dioxide were formed on Cu-TiO2 under VL irradiation. The mineralization of TCE to carbon dioxide was calculated to be only ca. 30.0%. It is noted that DCAA, PCA and TCAH were accumulated on the surface and were extracted with ethyl acetate. The porous Cu-TiO2 pellets show promise as the photocatalyst acting under VL irradiation for converting TCE gas to chlorinated compounds which can be used in industries. |
| Databáze: | OpenAIRE |
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