Abstract
Advanced oxidation processes have been successfully applied for wastewater treatment at a laboratory pilot and semi-industrial scale. Sustainable alternatives such as photo-Fenton processes have been scarcely applied due to technical, environmental, and economic barriers. Photo-Fenton intensification with organic complexes appears to be an important alternative to overcome two important disadvantages of Fenton processes, i.e., catalyst regeneration and operation at acidic pH. The addition of organic ligands is critical in improving process performance because it makes operation at circumneutral conditions possible, increases •OH radicals production rate, the regeneration of the iron catalyst, and allows the formation of additional radicals. Although Fenton intensification with organic ligands requires the addition of more reagents, technical and economic advantages such as near neutrality operation, reduction of chemical auxiliaries consumption (acid and base), and reaction time can enhance the environmental performance of Fenton and photo-Fenton processes.
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