Water Treatment by Heterogeneous Photocatalysis

When Ti02 is used as the photocatalyst, the photodegradation processes are nonselective, and, thus, only a given component from a mixture can be possibly degradded. Therefore, the preparation of selective photocatalysts is an interesting goal, since it opens new potential fields of application where nonselective, Ti02 catalysts cannot be used this can be the case for separation processes and for the selective elimination of pollutant molecules from a mixture [83,84] (see Section 9.5). 

9 Other Sources of Activation of a Photocatalyst. Mechanical Activation 

In this regard a new process for the elimination of organic pollutants in aqueous solutions is proposed [152], This methodology is in essence catalytic, analogous to that occurring during the activation of a photocatalyst with light or the radiation of a sonocatalyst with sound. 

The Physical Chemistry of Materials Energy and Environmental Applications 

FIGURE 9.21 Kinetics of the ball milling process with rutile incorporated in the reactor. 

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