Chapter 8: Catalytic Peroxone Process and the Coupled Processes Check Access

The peroxone process proposed by Staehelin and Hoigne in 1982 was used to decompose water contaminants, relying on the reaction between O₃ and H₂O₂ to produce hydroxyl radicals (˙OH). The superiority of this process lies in the rapid production of ˙OH and negligible secondary pollution, but the efficiency is highly dependent on the pH of the water matrix. Specifically, the peroxone process works efficiently under alkaline conditions but suffers from very poor performance in treating acidic wastewater. By the use of tailored catalysts, the established catalytic peroxone process overcomes such a difficulty and becomes an emerging topic of the field. This chapter deals with the catalytic peroxone process, especially the preparation methods, structures and properties of various catalysts and the catalytic mechanism. Following this, peroxone-coupled processes (e.g., with photolysis, photocatalysis, ultrasonication and plasma) that further improve the treatment efficiency of peroxone process were also introduced.