This brief summarizes the role of certain catalysts and associated processes that are involved
in the reduction or elimination of hazardous substances from wastewater and the exploitation of
renewable raw materials. The authors begin by providing a summary of the most recent
developments in catalysts used in the advanced oxidation of organic pollutants in aqueous
phase. Advanced Oxidation Processes (AOPS) are described in terms of homogeneous and
heterogeneous catalysts. Some emphasis is placed on the role nanocatalysts perovskite-type
catalysts and green catalysts play in several AOPs such as Fenton Chemistry photocatalytic
oxidation and the hybrid technologies that combine different processes. Catalyst preparation
characterization reaction chemistry and process technology are described. Specific wastewater
case studies which illustrate the role of these catalysts in AOPs completes the brief.
