Student Comments and Suggestions

*2. Cyanide ions (CN~) are very toxic. They can be photocatalytically transformed at the surface of Ti02 semiconducting particles into the much less problematic isocyanate ions (OCN~). This oxidation reaction in a basic medium requires two holes (h+) for every cyanide ion to produce one isocyanate ion. On the other hand, the complementary reaction (reduction) that occurs in a different region of the semiconducting particle requires a given number of electrons to reduce the dioxygen present in the solution, thus producing one molecule of hydrogen peroxide.

0 0

Post a comment