This special issue of the Journal of Solar Energy Engineering is dedicated to the solar detoxification of water. Solar photocatalytic treatment has become an important field of application, in which the sun, as a versatile nonpolluting energy source, provides a significant environmental value for sustainable water and hazardous waste management strategies. The main photocatalytic techniques for the treatment of recalcitrant or refractory pollutants—the so-called advanced oxidation processes (AOP)—are the heterogeneous $TiO2$ photocatalysis and the homogeneous photo-Fenton photocatalysis. Both involve the production of hydroxyl radicals responsible for the oxidation processes. Ongoing international research and development is covered in seventeen papers from Argentina, Australia, Austria, Brazil, Colombia, Germany, Ireland, Italy, Mexico, Peru, Portugal, Spain, Switzerland, Turkey, and the United States. The topics presented include solar wastewater treatment by $TiO2$ and by photo-Fenton in field applications (pesticides, surfactants, dyes, and olive-mill wastewater),...

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