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Decolouration of azo dyes by radicals generated from K 2 S 2 O 8 automatically in homogeneous aqueous solutions.

In this work, at 15 °C and 25 °C, authors study the decolouration reactions (or degradation reactions or oxidation reactions) of 0.10 mM azo dyes (methyl orange and congo red) by (1) K2 S2 O8 and (2) Co2+ /K2 S2 O8 , expounding the roles of K2 S2 O8 and Co2+ : K2 S2 O8 can oxidize azo dyes automatically in water by radicals; Co2+ has catalysis for oxidation of K2 S2 O8 , whether Co2+ is from CoSO4 or Co(NO3 )2 , CoCl2 , CoAc2 . The decolouration degree of azo dyes in all systems quickens with the increase of the initial concentration of K2 S2 O8 and the reaction temperature. In the presence and absence of Co2+ , comparative experiments are done between the oxidation of K2 S2 O8 and oxone, K2 S2 O8 shows weaker oxidation than oxone. The decolouration reaction of methyl orange (MO) in the system of (0.10 mM MO + 2.00 mM K2 S2 O8 ) accords with the second order reaction, the reaction rate constants are 4.789 M-1  min-1 at 15 °C and 5.894 M-1  min-1 at 25 °C respectively, the activation energy Ea is 14813 J/mol, and Arrhenius equation is k  = 2.328 exp[-14813/(RT)].

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