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CORONA-INDUCED OZONATION COUPLED WITH PHOTOOXIDATION: AN ENVIRONMENTALLY FRIENDLY AND COST-EFFECTIVE METHOD
Citation:
SahleDemessie*, E AND U R. Pillai**. CORONA-INDUCED OZONATION COUPLED WITH PHOTOOXIDATION: AN ENVIRONMENTALLY FRIENDLY AND COST-EFFECTIVE METHOD. Presented at 228th American Chemical Society National Meeting, Philadelphia, PA, August 22 - 26, 2004.
Impact/Purpose:
To inform the public
Description:
We have developed a process that uses surface corona for the production of ozone by passing air or oxygen through a high voltage electrical discharge and the emitted ultraviolet light is being used to activate a photocatalyst. A thin film of nanostructured TiO2 with primary particle size of 0.02 to 0.2 m was deposited on various substrates using flame aerosol method. The novel process has been used for a combination of ozonation and photocatalysis for effective and efficient oxidation of alcohols and hydrocarbons for producing value added products. The process can also be used for air and water cleaning. This oxidation protocol utilizes the advantage of both the high oxidizing power of ozone formed in the reactor as well as the photooxidation capability of the UV light generated during the ozone formation. This oxidation protocol utilizes the advantage of both the high oxidizing power of ozone formed in the reactor as well as the photooxidation capability of the UV light generated during the ozone formation. The process has been used for gas phase partial oxidation reactions to synthesize oxygenates, for the treatment of water contaminant such as methyl tertiary butyl ether, and treatment of air contaminated with high concentration of volatile organic compounds such as trichloroethylene. The corona discharge process allows a compact high intensity design of honeycomb systems with surface corona in each channel. The process has high energy-efficiency, long lifetime, does not employ any expensive or environmentally undesirable materials thereby rendering them both cost effective and eco-friendly.