Degradation of acid red 14 by silver ion-catalyzed peroxydisulfate oxidation in an aqueous solution

Authors: MOHAMMAD HOSSEIN RASOULIFARD, SEIED MOHAMMAD MAHDI DOUST MOHAMMADI, AZAM HEIDARI, ELHAM FARHANGNIA

Abstract: Silver ion (Ag^{1+})-catalyzed peroxydisulfate was studied for the degradation of acid red 14 (AR-14) in an aqueous medium. The effect of different parameters, such as temperature, peroxydisulfate concentration, and dye and Ag^{1+} concentrations, were investigated. Application of Ag^{1+}-catalyzed peroxydisulfate, as an advanced oxidation process, introduces an effectual method for wastewater treatment. An accelerated reaction using S_2O_8^{2-} to destroy dyes can be achieved via chemical activation with Ag^{1+} to generate sulfate radicals (SO_4^-). Degradation efficiency was not considerable when using peroxydisulfate alone. Studies revealed that increases in temperature and in the initial concentrations of peroxydisulfate and Ag^{1+} up to 80 mM and 10 mM, respectively, enhanced dye degradation, while a decrease in the initial dye concentration would also enhance the efficiency of its degradation.

Keywords: Advanced oxidation process, peroxydisulfate, acid red 14, Ag^{1+} catalyst, wastewater treatment

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