Identification of reaction intermediates/products from the photocatalytic degradation of trichloroethylene on illuminated titanium dioxide surfaces
- Purdue Univ., West Lafayette, IN (United States)
The objective of this study was to identify reaction intermediates/products from the gas-phase photocatalytic degradation of trichloroethylene (TCE) on anatase titanium dioxide (TiO{sub 2}) surfaces illuminated with near-ultraviolet light (360 nm wavelength). A Pyrex glass annular photocatalytic reactor fabricated with turbulence promoters was used for this purpose. The inner surface of the outside tube forming the annular reactor was coated with TiO{sub 2} prepared by vapor phase hydrolysis of titanium isopropoxide. Reaction intermediates/products were concentrated by passing the photocatalytic reactor off-gas through a stainless steel tube immersed in liquid nitrogen. Compounds deposited were allowed to revolatilize or were washed with deionized water and analyzed by gas chromatography with a mass spectrum selective detector (GC/MS), or by ion chromatography (IC), respectively. Preliminary results revealed the presence of many halogenated organic compounds, including phosgene, 1,2-dichloroethylene, chloroform, carbon tetrachloride, dichloroacetyl chloride, 1,1,2-trichloroethane, tetrachloroethylene, 1,1,2,2-tetrachloroethane, pentchloroethane, and hexachloroethane, as well as hydrochloric acid. The abundance of most of these compounds except phosgene and hydrochloric acid was observed to diminish with increasing oxygen concentrations. Possible reaction mechanisms and pathways for the photocatalytic degradation of TCE will be presented.
- OSTI ID:
- 395354
- Report Number(s):
- CONF-9505206-; TRN: IM9648%%477
- Resource Relation:
- Conference: 50. Purdue industrial waste conference, W. Lafayette, IN (United States), 8-10 May 1995; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 50. industrial waste conference; Wukasch, R.F. [ed.]; PB: 861 p.
- Country of Publication:
- United States
- Language:
- English
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