Novel embedded ceramic electrode system to activate nanostructured titanium dioxide for degradation of MTBE

Chulhan Kim, E. Sahle-Demessie, Pratim Biswas

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

Ozone has been used for water disinfection and purification. There have been few or no studies on the degradation of MTBE by the combination of ozone and titanium dioxide photooxidation. This approach was described, and was facilitated by novel developments of single step nanostructured film deposition and compact systems based on corona discharge that can both produce ozone and be used for activating the photocatalyst. The film deposited by the aerosol route adhered very well to the Pyrex tube surface. No observable losses of MTBE were noted after 3 hr without circulating gas bubbles. Less than 10% losses of MTBE were observed after 3 hr of percolating air. The enhanced effect of TiO2 photocatalysis was more noticeable when the ozone concentration was low than when it was high. Typical first-order decay for the combined ozone and UV-activated TiO2 photooxidation of MTBE with a rate constant of 0.78/hr with an initial MTBE concentration of 10 mg/L was observed, and was 2/hr with an initial concentration of 100 mg/L. These rates were in a comparable range with other methods used for MTBE degradation. The observed reaction rate could be limited either by the diffusion of species from water to the TiO2 surface or by the limited surface area of the TiO2 film in this system, and could be overcome by reactor optimization. The primary intermediates were tert-butyl alcohol and tert-butyl formate, and a small amount of acetone; and their concentrations increased for ∼ 1.5 to 2 hr and then decreased. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).

Original languageEnglish (US)
Pages (from-to)257-262
Number of pages6
JournalACS, Division of Environmental Chemistry - Preprints of Extended Abstracts
Volume44
Issue number2
StatePublished - 2004
Externally publishedYes
Event228th ACS National Meeting - Philadelphia, PA, United States
Duration: Aug 22 2004Aug 26 2004

ASJC Scopus subject areas

  • Energy(all)

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