UV irradiation of TiO2 promotes electrons from the valence band to the conduction band. The capabilities of the resulting redox system to degrade organic pollutants in water and the variety of products formed is illustrated here by the case of 2,3-dimethylpyrazine. Two debated questions, viz. (i) which electron-donors are implicated to fill in the electron deficiencies in the valence band? and (ii) is superoxide chemically involved in the photocatalytic degradations?, are addressed by using quinoline, the photo-Fenton reaction and superoxide dismutase. Finally, the favourable effect of ozone is exemplified by the photoctalytic removal of monochloroacetic acid.
Research on Chemical Intermediates – Springer Journals
Published: Jan 1, 2000
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