2. Photocatalysts and catalytic supports
2.1 Industrial photocatalysts and future improvements
The photocatalysts used (mainly TiO 2 , ZnO, Fe 2 O 3 , CdS, ZnS) are semiconductors with a medium-energy electronic band gap (1 to 3 eV) between the valence and conduction bands. Several semiconducting oxides or sulfides enable photocatalytic acceleration of a wide range of reactions of environmental interest. One of the most important factors in catalyst selection is the position of the band gap on the redox potential scale; this is shown in table 5 for the main catalysts used.
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Photocatalysts and catalytic supports
Effect of key parameters on the photocatalytic process
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