Solar photocatalytic degradation of the azo-dye acid orange 24 (AO24) was carried out by means of a photo-Fenton reaction. The dye degradation was monitored during the experimental runs through UV/Vis absorption as well as COD and TOC concentration determination and toxicity reduction. In two cases, a discoloration higher than 85% was reached using 50 kJ/L of accumulated energy. In the case of the best reaction conditions, a discoloration of up to 95% and a toxicity reduction from 37 to 5 TU were accomplished with 50 kJ/L. In the same experiment, the removal of COD up to 88% and TOC up to 85% was reached after 105 kJ/L. The reduction on toxicity values obtained by this methodology was most relevant and presents dye degradation by the solar photo-Fenton process as an interesting alternative for coupling with biological processes.
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