After performing this experiment, the student shall be able to:

• Understand the concepts of band gap, electron and hole generation in a semiconductor.

• Observe the dual nature of the photocatalytic reactions.

• Photoreduce a metal ion in solution.

• Photooxidize a surrogate organic pollutant.

• Analyze the effect of the absence or presence of light, oxygen, and of a semiconductor on photo-catalysis.

acid) and the reduction of a metal ion (Cu2+) are photocatalytically performed in an aqueous slurry containing Ti02 irradiated with UV light. The production of electrons (capable of reducing the metal ions) and of holes (capable of oxidizing the organic molecule) can be used for environmental clean-up.

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