[en] Advanced oxidation processes (AOPs) based on persulfate activated by zero valent iron (ZVI) were used to remove azo dyes in water. Activated persulfate generate to strong free radicals SO₄ (E⁰ = 2.6V) and HO (E⁰ = 2.8 V). The UV light was used to improve the efficiency of this activated persulfate. This study focused on determining a kinetic model, reaction rate constants and concentrations of SO₄ and HO in processes of persulfate activated by ZVI with or without UV light to degrade alizarin yellow R (AY). By using both experimental resultsand data analysis using the developed pseudo-first-order kinetic model, the reaction rate constants for the reaction of AY at pH 4.5 were determined to be 6.98×10^-4 s^-1 and 1.38×10^-3 s^-1 in condition without UV light and with UV light, respectively. The concentrations of SO₄, HO at 30 minutes of the process were 9.41×10^-4 mM, 4.12×10^-7 mM without UV and 8.58×10^-4 mM, 8.10×10^-7 mM with UV, respectively. (author)