Chapter 3: Catalytic Ozonation over Composite Metal Oxides Check Access

Composite materials are good alternatives in performing catalytic ozonation since they might have the intermediate properties of their constituents, which can give them greater recyclability, stability and performance in ozone decomposition. Their use can increase ozonation efficiency at the same time it reduces the drawbacks of heterogeneous catalytic ozonation. This chapter presents basic knowledge along with a critical review of composite materials used for catalytic ozonation applied for water and wastewater treatment. Among the different composite materials that can catalyze ozonation, perovskite-type and spinel-type mixed oxides are attractive catalysts of continuous interest in the scientific community due to their low cost when compared to other solid catalysts, high stability and good catalytic activity. The application of these catalysts for the removal of organic contaminants, including pharmaceuticals, dyes, phenols and others have been summarized and presented. Several aspects are discussed throughout this chapter, such as the performance of the catalysts and the mechanisms involved. In addition, the application of other natural minerals, such as zeolites, ceramic honeycomb and red mud, are discussed, and the main ones are summarized and presented. Future challenges and opportunities are discussed, and some promising studies are proposed.