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16                                 Multifunctional Photocatalytic Materials for Energy

          iv.  Hands-on field measurements that provide and validate the importance of these photocata-
            lytic reactions in order to better understand them; and
           v.  Proper modeling to get a better understanding of the relative impact of photocatalysis com-
            pared to other heterogeneous reactions.


         2.7   Conclusions


         This chapter discussed metal oxide-based heterogeneous photocatalysis and fo-
         cused on the basic concepts, such as theory and background, needed in order to
         understand this particular topic. This chapter also dealt with the principles behind
         metal oxide photocatalysis, thermodynamics, and the kinetic aspects that regulate
         photocatalytic performance. Different types of photocatalysts were discussed along
         with issues related to light, photochemical stability, and environmental concerns.
         Several methods used in oxide-mediated photocatalytic processes were covered,
         with the main focus on applications related to the environment and energy. Finally,
         future perspectives were suggested for the pursuit of studies and the use of novel
         tools that will enhance and adapt the basic principles for metal oxide-based hetero-
         geneous photocatalysis.


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