Additional Related Projects

• Quantify the amount of Cu(II) recovered after the optional re-dissolution step, by filtering the photocatalyst as described in the experiment and analyzing the resulting solution (for example, by atomic absorption).

• Quantify the amount of C02 produced by mass spectrometry or by gravimetry as BaCOs.

• Select other organic molecules with different standard potentials and discuss the role of the semiconductor band locations.

• Analyze the separate effect of adsorption by designing experiments in such a way that this effect can be distinguished from the other effects discussed in the experiment above (see Bumpus, 1999).

• Try other metal ions for recovery as a function of their standard potential.

• Use light of different wavelengths to observe any possible effects on the process.

• Test other semiconductors with different band gaps.

• Produce hydrogen photocatalytically from a sulfide/sulfite solution irradiated by sunlight (see Koca, 2002).

• Demonstrate a reduction reaction by the photo-catalytic reduction of carcinogenic yellow Cr(VI) to the much less dangerous green Cr(III) at UV-illuminated Ti02 (see Lin, 1993 and Praire, 1993). Use citric acid for the counter (i.e., complementary) reaction at low pH (e.g., pH 2, 0.7 M citric acid, 0.1 weight % of Ti02, 50 mg/L Cr(VI)).

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